❓ WA Parliament Question on Notice regarding strategies and preventative maintenance for wooden power poles to prevent pole top fires. The answer details inspection cycles, maintenance regimes, and the implementation of various strategies based on need.
AnsweredQoN 2366Legislative Assembly
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(b) what are the details of each of these strategies, including the frequency of implementation; (c) in the case in question, was each of these strategies carried out fully and in accordance with the required frequency of implementation; (d) what are the details of the preventative maintenance regime referred to in your letter; (e) what is the frequency of implementation of this preventative maintenance regime; and (f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(c) in the case in question, was each of these strategies carried out fully and in accordance with the required frequency of implementation; (d) what are the details of the preventative maintenance regime referred to in your letter; (e) what is the frequency of implementation of this preventative maintenance regime; and (f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(d) what are the details of the preventative maintenance regime referred to in your letter; (e) what is the frequency of implementation of this preventative maintenance regime; and (f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(e) what is the frequency of implementation of this preventative maintenance regime; and (f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(a) Four strategies are in place: 1. Structure tightening with spring washers and gang nail dispersion plates. This is effective short term but requires ongoing follow up work. 2. Line Insulator Washing. This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months. 3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
1. Structure tightening with spring washers and gang nail dispersion plates. This is effective short term but requires ongoing follow up work. 2. Line Insulator Washing. This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months. 3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
2. Line Insulator Washing. This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months. 3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months. 3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(c) in the case in question, was each of these strategies carried out fully and in accordance with the required frequency of implementation; (d) what are the details of the preventative maintenance regime referred to in your letter; (e) what is the frequency of implementation of this preventative maintenance regime; and (f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(d) what are the details of the preventative maintenance regime referred to in your letter; (e) what is the frequency of implementation of this preventative maintenance regime; and (f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(e) what is the frequency of implementation of this preventative maintenance regime; and (f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(f) in the case in question, was this preventative maintenance regime carried out fully and in accordance with the required frequency of implementation?
(a) Four strategies are in place: 1. Structure tightening with spring washers and gang nail dispersion plates. This is effective short term but requires ongoing follow up work. 2. Line Insulator Washing. This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months. 3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
1. Structure tightening with spring washers and gang nail dispersion plates. This is effective short term but requires ongoing follow up work. 2. Line Insulator Washing. This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months. 3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
2. Line Insulator Washing. This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months. 3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months. 3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
3. Bonding of HV insulator pins to a dispersion plate on the pole. Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Or Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines. New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator. 4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
4. Silicone coating of insulators. Effective long term and applied live line (b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(b) Implementation of strategies 1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
1. Structure Tightening This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened. This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This is performed as a retrofit exercise as and when inspections have indicated the action is required. 2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
2. Insulator Washing The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
The Insulators are washed with high-pressure distilled water to remove the pollutant material. Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Usually carried out in coastal environments subject to salt spray. Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months. 3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
3. Bonding This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate. This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
This is performed as a retrofit exercise as and when decided to be required. 4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
4. Silicone Treatment The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents. Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
Performed as a retrofit exercise as and when required. As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires. (c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation. (d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(d) The preventative maintenance regime for lines comprises the following activities: · Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Line patrols – an overview of the line by air or ground to identify and report on obvious defects. · Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed. · Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot. · Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public. · Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
· Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up. A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors. (e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(e) Implementation of preventative maintenance regime 1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
1. Line patrols are completed annually 2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
2. Vegetation Control – annually 3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
3. Wood Pole Inspection – conducted on a 4 year cycle 4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
4. Line Maintenance – annually 5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
5. Line Washing – as and when required (f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
AnswerView source ↗
Answered
23 March 2004
Responded by
Minister for Energy
Response time
98 days
There are some 600,000 wooden distribution power poles on the SWIS (South West Interconnected System) each of which is inspected over the course of a four year cycle. Determination is made at the time of inspection as to whether work for the prevention of pole top fires is warranted given the pole’s location and the likely effectiveness of any of the preventative measures. Line washing is performed periodically, in addition to washing done as a consequence of maintenance inspections in areas considered to be high risk.
(a) Four strategies are in place:
1. Structure tightening with spring washers and gang nail dispersion plates. This is effective short term but requires ongoing follow up work.
2. Line Insulator Washing.
This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months.
3. Bonding of HV insulator pins to a dispersion plate on the pole.
Or
Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines.
New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator.
4. Silicone coating of insulators. Effective long term and applied live line
(b) Implementation of strategies
1. Structure Tightening
This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened.
This is performed as a retrofit exercise as and when inspections have indicated the action is required.
2. Insulator Washing
The Insulators are washed with high-pressure distilled water to remove the pollutant material.
Usually carried out in coastal environments subject to salt spray.
Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months.
3. Bonding
This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate.
This is performed as a retrofit exercise as and when decided to be required.
4. Silicone Treatment
The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents.
Performed as a retrofit exercise as and when required.
As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires.
(c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation.
(d) The preventative maintenance regime for lines comprises the following activities:
· Line patrols – an overview of the line by air or ground to identify and report on obvious defects.
· Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed.
· Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot.
· Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public.
· Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up.
A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors.
(e) Implementation of preventative maintenance regime
1. Line patrols are completed annually
2. Vegetation Control – annually
3. Wood Pole Inspection – conducted on a 4 year cycle
4. Line Maintenance – annually
5. Line Washing – as and when required
(f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
(a) Four strategies are in place:
1. Structure tightening with spring washers and gang nail dispersion plates. This is effective short term but requires ongoing follow up work.
2. Line Insulator Washing.
This is effective short term. In coastal high pollution areas lines may need washing every 2 –3 weeks through the dry summer months.
3. Bonding of HV insulator pins to a dispersion plate on the pole.
Or
Bonding of HV insulator pins and LV neutral to dispersion plates on the pole. Effective long term but does reduce the design BIL (basic insulation level) affecting the lightning performance in lightning prone areas. Also difficult to apply live line to existing lines.
New line construction includes steel cross arms with cycloaliphatic insulators (anti pollution insulator) providing the same concept as bonding to eliminate the potential flow of leakage currents across the insulator.
4. Silicone coating of insulators. Effective long term and applied live line
(b) Implementation of strategies
1. Structure Tightening
This involves fitting of coil springs on the cross-arm, fixing king bolt and gang nail dispersion plates at insulator pint bolt arrangement with all nuts/spring washers tightened.
This is performed as a retrofit exercise as and when inspections have indicated the action is required.
2. Insulator Washing
The Insulators are washed with high-pressure distilled water to remove the pollutant material.
Usually carried out in coastal environments subject to salt spray.
Performed when required, may be every 2-3 weeks in coastal suburbs during dry summer months.
3. Bonding
This involves conductive bonding wire connecting the three HV insulator pins, to a gang nailed dispersion plate installed below the wood cross arm. Any leakage current flow across the insulator is then directed to the dispersion plate avoiding the insulator pin/cross arm interface where the pole top fire can emanate.
This is performed as a retrofit exercise as and when decided to be required.
4. Silicone Treatment
The insulators are spray coated with a silicone coating providing a hydrophobic surface to the insulator, which prevents the total wetting of the pollutant layer minimising the flow of leakage currents.
Performed as a retrofit exercise as and when required.
As the silicone coating application is both easier and cheaper then bonding, coating has been adopted as the primary approved mitigation strategy. A 5 year works programme commencing 2003/2004 financial year has been established to coat insulators on HV lines with a recorded high incidence of pole top fires.
(c) Each of these strategies is implemented as a result of an assessment carried out at the time of the four yearly inspection cycle or upon evidence of action being required. As such these strategies are employed on an ‘as needs’ basis and there is no specific requirement for frequency of implementation.
(d) The preventative maintenance regime for lines comprises the following activities:
· Line patrols – an overview of the line by air or ground to identify and report on obvious defects.
· Vegetation Control – tree pruning/vegetation control carried out to ensure that minimum clearances are not infringed.
· Wood Pole Inspection – to determine the pole condition and including ground line chemical treatment to mitigate fungal rot.
· Line Maintenance – the repair/replacement of critical defects found from the line patrol and/or reported by the public.
· Line Washing – washing of insulators on nominated susceptible lines to remove pollutant material build up.
A computer maintenance management system is utilised to determine the work priority, which includes assessment of critical importance, risk, environment and other factors.
(e) Implementation of preventative maintenance regime
1. Line patrols are completed annually
2. Vegetation Control – annually
3. Wood Pole Inspection – conducted on a 4 year cycle
4. Line Maintenance – annually
5. Line Washing – as and when required
(f) Yes. The last pole inspection was in 1999/2000. The next planned work has been approved and will be completed within 2003/2004. A vegetation inspection was conducted in 2002/2003 and the next planned work is scheduled and will be completed within 2004/2005.
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