电笔判断三相三线制供电线路相线接地故障口诀
星形接法三相线，电笔触及两根亮，剩余一根亮度弱，该相导线已接地；
若是几乎不见亮, 金属接地的故障。
说明：电力变压器的二次侧一般都接成Y形，在中性点不接地的三相三线制系统中，用验电笔触及三根相线时，有两根通常稍亮，而另一根上的亮度要弱一些，则表示这根亮度弱的相线有接地现象，但还不太严重；如果两根很亮，而剩余一根几乎看不见亮，则是这根相线有金属接地故障。
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