当电机作四极运转时，先按二极运转启动，然后切换开关使主绕组抽头A2与A4连接电机既作四极运转，此时副绕组开路。
When the motor runs in four-pole mode, it is started at two-pole mode and taps A2 and A4 are then connected together. In the meantime secondary winding is open.
纵差保护作为防御发电机定子绕组及其引出线相间短路的主保护，对发电机安全高效运行起着重要作用。
The Differential operation is a major protector for the stator winding and leading wire of a generator, to ensure the generator operating effectively.
对压板松动时大型汽轮发电机定子端部单根绕组的两自由度主共振问题进行了研究。
Two degree of freedom principal resonance of generator end winding is studied when the clamping plates are loose.
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