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发电机绕组匝间故障检测的新型探测线圈

DOI: 10.13334/j.0258-8013.pcsee.2014.06.013, PP. 917-924

Keywords: 新型探测线圈,定子内部短路,励磁绕组匝间短路,故障检测,谐波磁场,发电机绕组

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Abstract:

为了解决现有检测方法对同步发电机(尤其是应用广泛的汽轮发电机)常见的定子绕组匝间短路和励磁绕组匝间短路故障的局限性,提出了一种新型探测线圈。理论分析表明,由于采用特殊的布置及联接方法,开路的新型探测线圈在电机正常运行或机端外部故障时端口电压为0,而在绕组内部不对称故障时会对气隙磁场的故障附加谐波感应出电动势。而且在定子内部短路与励磁绕组匝间短路故障这两种情况下,新型探测线圈端口电压的频率明显不同。在多相整流实验样机上安装了上述探测线圈,通过实验验证了理论分析的正确性,说明可以根据新型探测线圈端口电压同时反映发电机的定子和转子绕组内部故障、并通过电压频率特征来区分具体的故障类型。

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