为什么要装设发电机的励磁回路接地保护?

2024-12-03 05:21:00
推荐回答(3个)
回答1:

励磁回路一点接地故障是常见的故障形式之一,励磁回路一点接地故障,对发电机并未造成危害,但相继发生第二点接地,即转子两点接地时,由于故障点流过相当大的故障电流而烧伤转子本体,并使磁励绕组电流增加可能因过热而烧伤;由于部分绕组被短接,使气隙磁通失去平衡从而引起振动甚至还可使轴系和汽机磁化,两点接地故障的后果是严重的,故必须装设转子接地保护。

回答2:

发电机转子励磁是直流,当转子绕组绝缘破损时,励磁绕组有一点与转子铁芯接触而通过转子轴承最终与地连接。如果此时直流系统还有一处发生接地,就会通过这点接地形成接地回路,有电流将流过轴承,会产生电火花烧损轴承,所以要设置发电机励磁回路接地保护,当发电机励磁回路有接地现象时发出警报,让运行人员进行检查和维护

回答3:

呵呵,励磁回路接地保护分一点接地和两点接地,一点接地时不要紧,但因为怕发生两点接地因此报警,提示人员处理。
两点接地是直接跳闸的,因为两个接地点之间会形成回路,励磁电流不通过磁极而直接通过两个接地点形成回路,会造成磁极间的磁拉力不平衡,发电机会有很大的震动并伴随着异常声音,励磁电流会突变大,发电机无功突变小,时间长了会烧毁励磁绕组和励磁系统,因此装设接地保护

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