Abstract
At present, with the continuous development of China's economy and the increasing capacity of generators, higher requirements are put forward for the operation reliability of pumped storage power stations. As the core component of the pumped storage unit, the research on the abnormal operation state of the generator-motor in China is not deep enough. In this paper, the generator-motor is taken as the research object, and the field circuit coupling time-step finite element model is established by Ansoft. This paper analyzes the law of electromagnetic force, air gap flux density and eddy current distribution of damping winding when single-phase ground short circuit fault, phase to phase short circuit fault and two-phase ground short circuit fault occur during no-load operation of generator-motor. It has reference significance for fault diagnosis of generator-motor in abnormal operation.
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