Electricity Asset Management Plan 2019-2029
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Vector Limited://
paralleled with the supply to Quay St substation at Liverpool. Operationally and from a risk-reduction perspective these two circuits need to be separated. This project will be completed with the upgrade of the Liverpool T3 transformer Option 1: Install a 110kV cable between Hobson and Quay St substations. Quay St substation achieves its N-2 security through a combination of the 110kV cable from Liverpool substation and the 22kV network from Hobson substation. Through a combination of load increase on Quay St substation, and reducing spare capacity backup from Hobson, there is a forecast security shortfall on Quay St substation. The installation of the 110kV cable in Quay St is part of the long term plan for this part of the CBD anticipation of the 110kV circuit, reuse of these ducts for 22kV circuits will deliver only 20% of the electrical capacity to Quay St that an equivalent 110kV circuit would supply for approximately the same cost Option 1: Install a new 22kV switchboard at Quay St substation. Additional 22kV distribution feeders are required out of Quay St substation. The existing 22kV switchboard cannot be extended. This project proposes installing an additional switchboard to supplement existing outgoing 22kV feeders. Option 2: Replace the existing 22kV switchboard incorporating the additional outgoing feeder circuit- breakers. This solution is more expensive than the proposed solution. Option 1: Install additional 22kV switchboard at Hobson substation. Additional 22kV distribution feeders are required from Hobson substation. The existing 22kV switchboard is to be replaced as an Asset replacement project. This project makes provision for extra distribution feeders as part of the replacement project. A new switchroom will also be added Option 1: Continuation of the 22kV cable rollout with in the CBD. This is a programme to progressively roll-out the 22kV distribution network across the CBD. The programme commenced in 2004, initially to address overloaded 11kV distribution cables. The second phase is well underway to achieve 22kV feeder coverage of the CBD to allow the connection of new/redeveloped buildings to 22kV network. The third phase is the conversion of existing 11kV substations to 22kV when asset replacement or capacity upgrades are required. Option 2: New feeders 22kV distribution – Hobson to Nelson St: To address forecast feeder capacity constraints Option 3: New feeders 22kV distribution – Hobson substation to the Waterfront: To address forecast feeder capacity constraints Option 4: New feeders 11kV distribution – Freemans Bay: To address forecast feeder capacity constraints Option 2: Upgrade the 22kV circuits to Quay St substation. As the ducts have been installed in
Reinforce the supply to Quay St substation
$3.0M Selected
Rejected
Increase distribution feeder capacity from Quay St substation
$2.2M Selected
$3.5M Rejected
Increase distribution feeder capacity from Hobson substation
$3.0M Selected
Increased distribution capacity within the CBD
$29.1M over 10 years
Selected
$1.6M Selected
$1.0M Selected
$2.0M Selected
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