Abstract：In daily operation of pumped storage station, generator-motor is featured with frequent start up and shut down, sharp operating load change. With the development of higher capacity and water head in recent years, the effects of thermal stress generated in operation load change on pumped storage unit’s safety and reliability have become more and more serious. Thermal stress not only has relation with the changing rate of thermal load and structure feature of generator-motor, but also is directly affected by cooling method. Firstly, the advantages and disadvantages of different cooling methods when applying in generator-motor are qualitatively analyzed in this paper. Then the design principle of thermal cycle test is proposed in order to compare the effects of different cooling modes on thermal cycle aging of insulation system. Finally, the maximum partial discharge is used as the representative parameter of the insulation characteristics. Through thermal cycle test, the influence of cooling mode on the insulating characteristics of pumped storage units was analyzed. The experimental results indicate that the anti-aging capability of evaporative cooling stator bar is much better than that of air cooling stator bar.
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2017, Vol. 32 
