Closed
RFT - Manapouri U4 Generator Condition Assessment, Clean and Repair
Tender ID: 557471
Tender Details
Organisation:
Tender #:
-
Status:
Closed
Publish Date:
21 May 2024
Closing Date:
10 June 2024
Tender Description
The time taken for each of the Manapouri units to reach braking speed has gradually increased over the past twenty years. To ensure each unit can reliably stop in the allotted time, mechanical works to address facing plate galling, and friction loading on the wicket gates must be completed. To complete these works, the unit must be disassembled, providing an appropriate opportunity to complete a thorough inspection and repair (if needed) of the generator equipment.
The purpose of the project, and all works completed under the project, is to return Manapouri Unit 4 back into service with a minimum 40-year performance life.
The Manapouri generators are closed circuit air cooled with six water-cooled heat exchangers located within the stator enclosure. As these heat exchangers are overrated for the heat load, the flow through these coolers is throttled back. In addition to throttling back the coolers, the unit is fitted with six heaters to maintain a constant stator temperature when the unit is not running.
The stator windings are a bar type wave winding featuring an epoxy mica thermosetting insulation system. These are assembled in the 360 open stator slots in the core with a ripple spring and fibre glass wedging system securing the windings in the slots.
Partial discharge levels are measured via capacitive couplers connected to the high voltage end of the terminal windings on all three phases for each generator.
Location
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