Electricity Asset Management Plan 2019-2029
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Vector Limited://
platform for the flow of energy under the new energy future means that our knowledge of the LV network is already receiving increased focus and this will expand as we go forward.
4.5.2 DISTRIBUTION FEEDERS LV UNDERGROUND Population and Age
Approximately 63% of the LV network in the Auckland region is underground and in some areas the underground network has been in service for 60 plus years. Pockets of underground LV networks exist in the Northern region but the underground network in the Northern region, where it exists, is generally younger – due to extensive subdivisions in the Northern region the underground LV network is expanding. The table below shows key data for our LV underground cable population, distribution pits and pillars.
DESCRIPTION
AUCKLAND
NORTHERN
Circuit length of LV underground cable distribution feeders (km)
3363
2243
No of LV connection pits
37689
12866
No of LV above ground distribution pillars
59555
27709
No of LV buried distribution link boxes
123
18
Table 4-15 Key statistics for LV Underground Cable Network
Condition and Health Similar to the LV OH network, the same legacy data deficiencies exist for the LV underground network, except for new underground cable installations. Hence, for the overall population of underground LV cables, Vector does not presently have robust data with regard to its condition and health and an age profile graph is thus not included. Our programme for CBARM models include the development of a model for our LV pits and pillars and the gathering of data for the CBARM model will be undertaken as part of our planned maintenance inspections. We are not experiencing any systemic network failure modes in our LV underground network but we are seeing a slight increase in faults in older parts of the LV underground network, notable in St Heliers and Mission Bay. At this point in time the frequency and number of faults are such that the issue is certainly not viewed as systemic. The biggest threat and cause of faults in the LV underground cable network is damage by third party excavations and vehicle strikes on pillar boxes. 4.5.3 DISTRIBUTION SOLAR AND BATTERY DISTRIBUTED GENERATION Population and Age The table below summarises our population of solar panel/battery installations and stand-alone battery installations.
No of solar panel installations complete with storage batteries
460
No of storage battery installations
230
Table 4-16 Key statistics for Solar/Battery installations and stand-alone Battery Installations
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