Electricity Asset Management Plan 2019-2029
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Vector Limited://
5.1.3 RELOCATIONS
OUTDOOR TO INDOOR SWITCHGEAR CONVERSIONS AT TRANSPOWER GXPS
NEED STATEMENT Transpower is undertaking a program to convert ageing outdoor 33 kV bulk oil CBs at GXPs in Auckland. The Transpower owned and operated bulk oil CBs have been in service since the 1960s and there has been a number of catastrophic failures of the bulk oil CBs. Under agreement with Transpower, Vector will undertake the relocation of its subtransmission circuits to the new indoor switchgear. OPTIONS CONSIDERED To ensure continued reliability at GXPs to Vector’s subtransmission zone substations Transpower will replace all ageing bulk oil filled CBs at GXPs. No other viable options exist to address the H&S risks and/or risks to reliability of supply. Description
DESCRIPTION
OPTIONS
ESTIMATED COST (NPV IF APPLICABLE)
STATUS
Option 1
Do nothing: this option has been discounted because of the on-going risks posed by the ageing bulk oil subtransmission CB population. Obtaining spares for the 1960s vintage CBs is becoming an increasing challenge to Transpower Because of the risks posed by ageing bulk oil CBs Transpower has elected to embark on a nationwide programme of works to removed such CBs from the network and replace them with maintenance efficient SF6 fixed pattern switchgear. This switchgear contains the latest arc flash technology to remove the risk of harm to operators and the public.
N/A Rejected
Option 2
$7.80M Selected
PROPOSED INVESTMENT SUMMARY ($MILLION NOMINAL)
DESCRIPTION
FY20
FY21
FY22
FY23
FY24
FY25
FY26
FY27
FY28
FY29 TOTAL
Mangere Transpower 33 kV switchboard Wellsford Transpower 33 kV switchboard
3.00
3.00
2.00
2.00
Wiri Transpower 33 kV switchboard
2.50
2.50
Mt Roskill Transpower 33 kV switchboard
0.30
0.30
Total CAPEX
3.30
0.00
2.50
2.00
0.00
0.00
0.00
0.00
0.00
0.00
7.80
ASSET RELOCATIONS REQUESTS
NEEDS STATEMENT One of Vector’s objectives when planning projects and compiling the capital budget is to identify the need to relocate Vector assets when reasonably required by third parties. Depending upon the third party making the relocation request, Vector is obliged to relocate its assets by Sections 32, 33 and 35 of the Electricity Act, Section 54 of the Government Roading Powers Act 1989 and Sections 147A and 147B of the Telecommunications Act 2001 and, by the specific terms of licences or easements under Sections 34 and 35 of the New Zealand Railways Corporation Act 1981. Relocations required by these Acts often occur when infrastructure projects are initiated by road or rail corridor managers, particularly Auckland Transport, NZTA, Kiwirail and other utility providers such as Chorus. The process and funding of such relocation work is governed by the relevant Acts. The investment summary below covers a number of anticipated relocation projects that are consolidated into two lines items namely Auckland and Northern, reflecting their location on Vector’s network. However, the Auckland Light Rail project is shown as a separate line item in the investment summary table below because of the very high level of projected relocation cost to Vector. It will be noted that the Auckland Light Rail project has a significant impact on raising the forecast spend for relocations from AMP 2018 to AMP 2019.
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