Electricity Asset Management Plan 2019-2029
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Vector Limited://
Figure 4-9 Age profile for 33 and 22 kV overhead conductors
Figure 4-10 Age profile for 33 and 22 kV overhead poles
Condition and health The 33 kV subtransmission network has a weighted average age of 44 years with over 42% constructed in the 1970s. The 22 kV subtransmission overhead network is relatively young (installed in the early 2000s). Only 2% of 33 kV conductors presently in service has been installed since 1995. There are few performance metrics for overhead conductor. The closest proxy is the number of failures that are listed as overhead conductor. There are no in-service tests on conductors to check condition. Strategy Vector has introduced a programme of works for the replacement of overhead conductors that focuses on small sized 11 kV conductors e.g. 14.5mm to 16mm Copper conductors and 22.5mm Aluminium conductors. Further details are given
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