Electricity Asset Management Plan 2019-2029
167
Vector Limited://
maintaining the status-quo which a “Do-nothing” option would deliver. Option 2: Expand PQ monitoring capability. Progressively extend the PQ monitoring capability to zone substation not already monitored, focussing initially on the remaining commercial/industrial substations. This will allow us to continue the “trending” objective and provide customer support for PQ-initiated plant outages Option 1: Do nothing. It is important we find cost-effective and timely solutions to emerging network problems. Failure to do so will place us in a costly reactive mode delivering unsatisfactory long-term solutions Option 2: Develop LV resilience solutions. Develop network-wide solutions to emerging network problems in a timely and cost-effective manner
$1.5M Selected
Improve LV resilience capability
Rejected
$10.0M Selected
FORECAST INVESTMENT SUMMARY ($MILLION NOMINAL)
DESCRIPTION
FY20
FY21
FY22
FY23
FY24
FY25
FY26
FY27
FY28
FY29 TOTAL
Core digital services for network monitoring
0.75
0.75
1.00
0.50
0.50
0.50
4.00
LV monitoring – Auckland network
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
5.00
LV monitoring – Northern network
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
5.00
Power Quality monitoring
0.10
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
1.45
LV resilience development
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
10.00
Total CAPEX
2.85
2.85
3.15
2.65
2.15
2.65
2.15
2.65
2.15
2.15
25.45
NETWORK RESILIENCE INITIATIVES
NEEDS STATEMENT One measure of network resilience is the length of time taken to restore supply following a fault. The standard performance measure is SAIDI as it combines the fault duration with the number of customers affected by the fault. To improve SAIDI Vector intends to accelerate its programme of works to improve the utilisation of existing remote control devices and install new remote control devices in the underground and overhead 11 kV distribution network. The intention is to install remote control at key locations on the 11 kV network that will enable faster isolation and restoration of supply to customers that are not within the faulty section of the network. This programme of works commenced in AMP 2018 and will continue over the AMP 2019 period, culminating in an increased in the number of existing and new switches with remote control capability. Priorities are 11 kV feeders associated with single transformer zone substations, feeders that experience frequent faults, and those feeders that supply large numbers of customers and incur high SAIDI during an outage. We are targeting a reduction in the maximum number of customers between network isolation points to less than 500. A network outage results in those customers between isolation points being without power until the necessary remedial work is completed. Reducing the number of customers between isolation points not only reduces the number of customers without power but also reduces the SAIDI impact. We commenced a programme in 2018 and will continue over the AMP 2019 period, to increase the number of network isolation points to achieve this outcome. Distribution feeders to some of the more remote parts of the Vector network are without redundancy. That is, a fault on the network needs to be repaired before power can be restored. In most cases, the cost of building in network redundancy is prohibitive but we have identified a number of locations where a short extension to an existing distribution feeder allows connection to an alternate feeder, providing at least partial network backup to customers on both feeders. Specific resilience initiatives have been included as specific projects. A provisional budget has been included for continuation of this initiative from 2023 onwards. Specific projects will replace this provisional budget as they are identified, scoped and costed.
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