❓ WA Parliament Question on Notice regarding power outages in Perth metropolitan area in 2007. Provides data on outage frequency, duration, affected homes, and primary causes for the 10 worst affected suburbs.
AnsweredQoN 3031Legislative Assembly
QuestionView source ↗
(a) the number of power outages each of these localities suffered during this period;
(b) the duration of the shortest and longest power outages of each locality;
(c) the average duration of outages affecting each of these localities;
(d) the greatest and lowest number of homes affected by these outages for each locality;
(e) the average number of homes affected by these outages for each locality; and
(f) the primary causes of these outages, listed separately for each outage.
(b) the duration of the shortest and longest power outages of each locality;
(c) the average duration of outages affecting each of these localities;
(d) the greatest and lowest number of homes affected by these outages for each locality;
(e) the average number of homes affected by these outages for each locality; and
(f) the primary causes of these outages, listed separately for each outage.
AnswerView source ↗
Answered
1 April 2008
Responded by
Minister for Energy
Response time
35 days
Western Power has provided the Minister for Energy with the following response.
The ten localities in the Perth metropolitan area which have suffered the most power outages in 2007 have been selected based on highest
SWIS
SAIDI
contribution.
The selected localities are ones with more than 99 customers and are supplied by Perth Metropolitan distribution feeders.
SAIDI
(System Average Interruption Duration Index) is the average total sustained interruption time (in minutes) that each customer experienced over a 12-month period, based on the total number of customers on the system
.
The 10 worst affected suburbs are listed in descending order, based on the highest number of outages recorded for each suburb for the calendar year 2007:
Table 1: Worst affected suburbs 2007
Gidgegannup
Mundaring
Stoneville
Chidlow
Keysbrook
North Dandalup
Dawesville
Ravenswood
Karnup
Erskine
(a) Number of outages:
Suburb
Number of Outages
Gidgegannup
120
Mundaring
90
Stoneville
81
Chidlow
56
Keysbrook
44
North Dandalup
35
Dawesville
32
Ravenswood
30
Karnup
23
Erskine
11
(b) Duration of outages:
Suburb
Shortest Outage
Longest Outage
Gidgegannup
3 minutes
13 hours
Mundaring
8 minutes
11 hours
Stoneville
3 minutes
7 hours
Chidlow
2 minutes
9 hours
Keysbrook
5 minutes
11 hours
North Dandalup
5 minutes
11 hours
Dawsville
16 minutes
20 hours
Ravenswood
1 minutes
13 hours
Karnup
1 minutes
13 hours
Erskine
1 hour
10 hours
(c) Average duration of outages:
Suburb
Average Outage Duration
Dawsville
4 hours
Gidgegannup
3 hours
Mundaring
3 hours
Chidlow
3 hours
Erskine
3 hours
Ravenswood
3 hours
Karnup
3 hours
Keysbrook
2 hours
North Dandalup
2 hours
Stoneville
2 hours
(d) Homes affected:
Suburb
Highest Number of Homes Affected
Lowest Number of Homes Affected
Dawsville
1775
4
Mundaring
1418
1
Erskine
1278
22
Gidgegannup
1064
1
Stoneville
849
3
Chidlow
636
2
Ravenswood
284
2
North Dandalup
255
2
Karnup
230
2
Keysbrook
111
1
(e) Average number of homes affected:
Suburb
Average Number of Homes Affected
Dawsville
480
Erskine
476
Mundaring
345
Stoneville
286
Chidlow
159
Gidgegannup
150
Ravenswood
154
Karnup
78
North Dandalup
64
Keysbrook
30
(f) Primary cause of outages:
Suburb
Primary Cause of Outages
Gidgegannup
Planned outages (42)
Equipment failures (25)
Unknown (14)
Mundaring
Planned outages (37)
Equipment failures (11)
Unknown (16)
Vegetation (8)
Stoneville
Planned outages (23)
Equipment failures (22)
Unknown (17)
Chidlow
Planned outages (24)
Equipment failures (15)
Keysbrook
Planned outages (12)
Equipment failures (15)
North Dandalup
Planned outages (8)
Equipment failures (10)
Unknown (7)
Dawsville
Planned outages (5)
Equipment failures (15)
Unknown (7)
Ravenswood
Planned outages (5)
Equipment failures (10)
Unknown (7)
Karnup
Planned outages (5)
Equipment failures (8)
Erskine
Equipment failures (4)
Transmission failures (3)
Definitions:
·
Planned outages
are when customers have been given a minimum of 3 days advance notice of the outage. Planned outages are generally as a result of undertaking network improvement work.
·
Equipment failure
is where the condition of the equipment results in equipment failing, including pole top fire incidents.
· A fault cause listed as
vegetation
is when vegetation interferes with the equipment resulting in an outage, including private vegetation.
·
Transmission failures
are where it was determined that the fault occurred as a result of a problem or failure on the transmission network, including the substation.
· A fault cause is listed as
unknown
when the cause of the outage could not be determined.
Note:
The total number of actual outage events (394) that had occurred in the worst affected suburbs is less than the aggregate (522) of the outages in the individual suburbs listed in Table 1. This is because one fault event on the network resulting in an outage may affect a number of suburbs. For example, an equipment failure on the SV 502.0 Mundaring 22-kV feeder (supplied from Sawyers valley zone substation) could affect the suburbs of Mundaring and Stoneville.
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The ten localities in the Perth metropolitan area which have suffered the most power outages in 2007 have been selected based on highest
SWIS
SAIDI
contribution.
The selected localities are ones with more than 99 customers and are supplied by Perth Metropolitan distribution feeders.
SAIDI
(System Average Interruption Duration Index) is the average total sustained interruption time (in minutes) that each customer experienced over a 12-month period, based on the total number of customers on the system
.
The 10 worst affected suburbs are listed in descending order, based on the highest number of outages recorded for each suburb for the calendar year 2007:
Table 1: Worst affected suburbs 2007
Gidgegannup
Mundaring
Stoneville
Chidlow
Keysbrook
North Dandalup
Dawesville
Ravenswood
Karnup
Erskine
(a) Number of outages:
Suburb
Number of Outages
Gidgegannup
120
Mundaring
90
Stoneville
81
Chidlow
56
Keysbrook
44
North Dandalup
35
Dawesville
32
Ravenswood
30
Karnup
23
Erskine
11
(b) Duration of outages:
Suburb
Shortest Outage
Longest Outage
Gidgegannup
3 minutes
13 hours
Mundaring
8 minutes
11 hours
Stoneville
3 minutes
7 hours
Chidlow
2 minutes
9 hours
Keysbrook
5 minutes
11 hours
North Dandalup
5 minutes
11 hours
Dawsville
16 minutes
20 hours
Ravenswood
1 minutes
13 hours
Karnup
1 minutes
13 hours
Erskine
1 hour
10 hours
(c) Average duration of outages:
Suburb
Average Outage Duration
Dawsville
4 hours
Gidgegannup
3 hours
Mundaring
3 hours
Chidlow
3 hours
Erskine
3 hours
Ravenswood
3 hours
Karnup
3 hours
Keysbrook
2 hours
North Dandalup
2 hours
Stoneville
2 hours
(d) Homes affected:
Suburb
Highest Number of Homes Affected
Lowest Number of Homes Affected
Dawsville
1775
4
Mundaring
1418
1
Erskine
1278
22
Gidgegannup
1064
1
Stoneville
849
3
Chidlow
636
2
Ravenswood
284
2
North Dandalup
255
2
Karnup
230
2
Keysbrook
111
1
(e) Average number of homes affected:
Suburb
Average Number of Homes Affected
Dawsville
480
Erskine
476
Mundaring
345
Stoneville
286
Chidlow
159
Gidgegannup
150
Ravenswood
154
Karnup
78
North Dandalup
64
Keysbrook
30
(f) Primary cause of outages:
Suburb
Primary Cause of Outages
Gidgegannup
Planned outages (42)
Equipment failures (25)
Unknown (14)
Mundaring
Planned outages (37)
Equipment failures (11)
Unknown (16)
Vegetation (8)
Stoneville
Planned outages (23)
Equipment failures (22)
Unknown (17)
Chidlow
Planned outages (24)
Equipment failures (15)
Keysbrook
Planned outages (12)
Equipment failures (15)
North Dandalup
Planned outages (8)
Equipment failures (10)
Unknown (7)
Dawsville
Planned outages (5)
Equipment failures (15)
Unknown (7)
Ravenswood
Planned outages (5)
Equipment failures (10)
Unknown (7)
Karnup
Planned outages (5)
Equipment failures (8)
Erskine
Equipment failures (4)
Transmission failures (3)
Definitions:
·
Planned outages
are when customers have been given a minimum of 3 days advance notice of the outage. Planned outages are generally as a result of undertaking network improvement work.
·
Equipment failure
is where the condition of the equipment results in equipment failing, including pole top fire incidents.
· A fault cause listed as
vegetation
is when vegetation interferes with the equipment resulting in an outage, including private vegetation.
·
Transmission failures
are where it was determined that the fault occurred as a result of a problem or failure on the transmission network, including the substation.
· A fault cause is listed as
unknown
when the cause of the outage could not be determined.
Note:
The total number of actual outage events (394) that had occurred in the worst affected suburbs is less than the aggregate (522) of the outages in the individual suburbs listed in Table 1. This is because one fault event on the network resulting in an outage may affect a number of suburbs. For example, an equipment failure on the SV 502.0 Mundaring 22-kV feeder (supplied from Sawyers valley zone substation) could affect the suburbs of Mundaring and Stoneville.
Notice: This document is created or edited using unregistered or evaluation copy of rtLib valid for testing or development purposes only. To use it for productive or any other purposes please register it. You may purchase the license on
http://www.rtlib.com
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