Electricity Asset Management Plan 2019-2029
208
Vector Limited://
TARGETED OUTCOMES
CUSTOMER EXPERIENCE
SAFETY
RELIABILITY
RESILIENCE
OPERATIONAL EFFICIENCY
CYBER SECURITY AND PRIVACY
OPTIONS CONSIDERED Options to address the need identified above have been assessed and are summarised in the following table.
DESCRIPTION
DISCUSSION OF OPTION
ESTIMATED COST (NPV IF APPLICABLE)
STATUS
Option 1: Do nothing
A ‘Do-nothing’ approach means that Vector will continue to use existing first generation PQM meters for which software is not supported anymore. This will lead to the risk of Vector not being able to measure and analyse the quality of power and peak demand at the source of supplies to the distribution network Improves visibility of the network peak demand, provides a check of energy flow through revenue meters, allows post incident network parameter analysis and allows reporting on power quality. A reliable, technically sound and software supported fleet of PQM meters at zone substation will allow Vector to monitor its compliance with power quality standards
Rejected
Option 2: Undertake a staged and scheduled programme of works to refurbish and replace PQM meters as the case may be
$3.4M Selected
PROPOSED INVESTMENT SUMMARY ($MILLION NOMINAL)
DESCRIPTION
FY20
FY21
FY22
FY23
FY24
FY25
FY26
FY27
FY28
FY29 TOTAL
Northern PQM replacements
0.07
0.07
0.07
0.07
0.07
0.12
0.13
0.13
0.12
0.13
0.98
Auckland PQM replacements
0.07
0.07
0.07
0.07
0.07
0.12
0.13
0.13
0.12
0.13
0.98
PQM new sites rollout
0.10
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
1.45
Total CAPEX
0.24
0.29
0.29
0.29
0.29
0.39
0.41
0.41
0.39
0.41
3.41
ROUTERS, RTU, COMMUNICATIONS CABLES AND COMMUNICATIONS DEVICES UPGRADES
NEEDS STATEMENT Vector’s zone substations are interfaced to the WAN and the SCADA master station in the EOC via routers in SCADA panels at zone substations. The majority of routers are Cisco model 2811 routers for which software support will end within the next year and replacement spares are becoming an issue to source and software security updates cannot be implemented to an appropriate level to ensure breach of SCADA is a low risk. There is a need to replace first generation network routers and network switches with devices that are technically supported. Notwithstanding the rollout of a fibre optic communications network that has been going for a number of years there are still communications channels, for SCADA and unit differential protection communications, between a number of zone substations and from zone substations to wide area network primary nodes that consist of copper cables. These copper communications and differential protection cables have been in service for circa 50 to 60 years and are failing and heavily committed, i.e. little or no spare channels. A major risk to Vector is loss of communications and visibility due to deterioration of the insulation of individual cores to a point where they come in contact with other cores. Cable joints are also a source of failure where moisture ingress causes low resistance between cores and then result in failures of joints. Going into the future there is a need to replace copper cables with fibre optic networks not only for the sake of replacement of the ageing copper based assets but to make the network ready for future communications bandwidth requirements. There are 295 11 kV network switches with SCADA remote control ability on Vector’s 11 kV overhead network. Of these units 56 use Very High Frequency (VHF) radio for communications and the remainder use 2G cellular communications. The EOC can remotely control pole mounted 11 kV switches to isolate faulted sections of the network and restore healthy
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