PowerNet Ltd - Bluff Substation Switch Board Upgrade - CONSTRUCTION

Details

Tender Closed
RFx ID :	30967960
Tender Name :	PowerNet Ltd - Bluff Substation Switch Board Upgrade - CONSTRUCTION
Reference # :	CON-521091
Open Date :	Monday, 3 February 2025 4:00 PM (Pacific/Auckland UTC+13:00)
Close Date  :	Friday, 21 March 2025 4:30 PM (Pacific/Auckland UTC+13:00)
Tender Type :	Request for Quotations (RFQ)
Tender Coverage :	Sole Agency  [?]
Categories :	39122100 - Electrical transmission and distribution equipment
Regions:	N/A
Exemption Reason :	None
Required Pre-qualifications :	None
Contact :	Justin Adams jadams@powernet.co.nz 0272364592
Alternate Physical Delivery Address  :
Alternate Physical Fax Number  :
Agency Address :	NEW ZEALAND

The Bluff Substation is a pivotal 33/11 kV zone substation serving the town of Bluff and its surrounding area. Equipped with two 13 MVA transformers and classified with a security level AAA, it supplies urban domestic loads and several large to medium industrial customers and includes an 11 kV feeder connection to the Flat Hill Wind Farm. With the original 11 kV switchboard dating to 1981 and significant components reaching the end of their expected useful life, an upgrade is essential. Potential future load increases from clients like Southport (2.5 MW) and Ocean Beach Freezing Works (5 MVA) further necessitate these improvements to ensure reliability, safety, and capacity for anticipated growth.
The primary design focuses on replacing and upgrading high-voltage equipment, including the indoor 11 kV switchgear, two local service transformers (LSTs), 33 kV air break switches (ABSs), 33 kV current transformers (CTs), and overhead conductors to improve operational efficiency and accommodate future expansion.
Secondary system upgrades involve the replacement of protection relays with new digital equipment and associated items and implementation of an arc flash protection scheme. The 110 V DC system is to be decommissioned, and loads are to be migrated to a 24 V DC system to streamline power supply infrastructure and reduce maintenance.
Communication and SCADA system upgrades involve replacing the existing Remote Terminal Unit (RTU) and installing a layer two managed network switch. All devices are connected via Ethernet fibre optics (preferred) or copper RJ45, utilising a Ruggedcom network switch. Each SEL Intelligent Electronic Device will connect to the network using multimode fibre. All devices will be synchronised with the new GPS clock, ensuring accurate time-stamping and event recording.
The following existing indoor panels (LTAC & DC, Transformer Protection, TCOL, and Communication & 24 V DC panels) are to be replaced with three floor-mounted panels (24 V DC Distribution, T1 Protection & Control, and T2 Protection & Control). Other new cabinets are to be installed, including a new 400 V AC wall-mounted cabinet, two additional outdoor junction boxes for 33 kV CT terminations, and two new transformer management cabinets. The existing P3 (Communication and RTU) is to remain. The toilet area will be demolished, and the existing 24 V DC battery bank and the associated charger will be relocated there.

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