D—4
Machine Running Times
WaitaJci. —The average river flow during the year was 11,700 cusecs, compared with 12,800 cusecs during the previous year. A turbine gate lower bearing greasing-nipple unscrewed on No. 2 generator, which .allowed a jet of water to play up into the generator windings and caused a stator winding failure necessitating the replacement of ten full coils and six half-coils. The unit was •out of service from 13th May to 14th June. In reassembling No. 2 unit after repair, an experiment with dry ice, for shrinking the coupling bolts to enable them to be inserted in the flanges without driving, was very .successful.
Machine-running Times
Highbank.—No water was drawn from the race from 28th April till 18th September, but thereafter water was drawn as required for irrigation purposes. The average units generated per hour of running were 18,599 compared with 21,689 the previous year. Steps were taken to reduce troubles caused by sand getting into the control mechanisms on the main and auxiliary turbines. The station was shut down for general •overhaul from Bth to 24th January, 1950. Three new groynes were built in the Rakaia River by the Ministry of Works to protect the station, and three damaged groynes were repaired.
Machine-running Times
24
Generator No. Time on Load. Time Idle. Time Under Repair. Percentage Availability for Service. Hours. Percentage. Hours. 1 Percentage. Not in Demand (Hours). In Demand (Hours). 1 5,530 63-2 2,196 25-0 1,034 88-2 ■2 5,585 63-8 2,693 30-7 482 94-5 3 5,317 60-7 2,980 34-0 463 94-7 4 2,376 27-1 6,257 71-4 127 98-5 5 2,390 27-3 6,284 71-7 86 99-0 ■43 2,337 26-7 5,981 68-3 442 95-0 7 2,326 26-6 5,585 63-7 849 90-3 8 3,442 39-3 5,287 60-4 31 99-7 •9 3,364 38-4 5,023 57-3 373 95-7
Generator No. Time on Load. Time Idle Time U nder Repair. Percentage Availability for Service. Hours. Percentage. Hours. Percentage. Demand j Demand (Hours). (Hours). 1 7,372 84-2 1,388 15-8 100-0 2 6,777 77-4 1,233 141 750 i 91-5 3 6,327 72-2 2,382 27-2 51 99-4 4 5,993 68-4 2,674 . 30-5 93 98-9 £ 5,747 65-6 2,991 34-1 22 99-7
Time on Load. Time Idle. Time under Repair. Percentage Availability for Service. Generator JSTo. Hours. Percentage. Hours. Percentage. Not in Demand (Hours). In Demand (Hours). 1 8,153 93-1 96 11 511 94-2