水轮发电机磁极线卷匝间短路缺陷,在老式绝缘结构的机组中时有发生。严重的匝间短路将引起机组振动增大和绕组局部过热,给机组安全运行带来一定的威胁。对有严重匝间短路的磁极线卷,大修中必须进行处理或更换。为了正确寻找故障磁极线卷和确定匝间短路位置,我厂先后采用过直流压降法、开口变压器法和交流阻抗与直流压降相结合等多种办法。多年的实践证明,用交流阻抗和 Turbine pole coil inter-turn short-circuit defects in the insulation of the old unit occurred from time to time. A serious turn-to-turn short circuit will cause the unit vibration increases and the winding local overheating, to some extent threaten the safe operation of the unit. For the coil with a serious inter-turn short circuit, overhaul must be handled or replaced. In order to correctly find fault magnetic pole coil and determine the location of inter-turn short circuit, our factory has adopted DC voltage drop method, open transformer method and AC impedance and DC voltage drop combined with other methods. Years of proven practice, using AC impedance and