Electricity Asset Management Plan 2019-2029
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Vector Limited://
Figure 4-37 Asset Health at Year 10 - Distribution Pole Mounted Transformers
Strategy Our pole mounted transformer fleet is maintained in accordance with ESM502 Maintenance of Pole Mounted but replacement on failure is done reactively and fault analysis has not warranted a programme of replacement. However, we have a number of transformers in this fleet that have exceeded the stated asset life for this asset class and we are planning an intervention programme based on asset health and criticality – our CBARM model will inform this strategy. Smaller size pole mounted transformers in rural areas that are not meshed via an LV network will be less impacted by the future energy network and its management in terms of distributed energy resources. However, for larger distribution transformers in meshed suburban areas the same issue will apply as for ground mounted transformers, i.e. lack of visibility but this will be overcome by utilising advanced metering infrastructure and digital equipment as well as the installation of transformer sensing/monitoring devices to inform us in terms of energy flows and control as distributed energy resources gain mass in the network. Voltage regulators are normally used in long rural, and sometimes remote feeders to boost the voltage. Essentially, they are tap-changing autotransformers that maintain network voltage within desired limits and automatically produce a regulated output voltage from a varying input voltage. Population and Age Vector does not have a large population of voltage regulators in its network: only nine are installed and they exist on lengthy rural feeders in the Auckland and Northern networks. 4.6.5 DISTRIBUTION VOLTAGE REGULATORS Overview
Condition and Health Our voltage regulators are in good condition, relatively young with no systemic issues.
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