三相四线制零线带电的原因！实用电动机控制电路接线图
1.出现这种情况是零线断线或零线接头处松脱或氧化接触不良所至。检查方法很简单，只要用电笔往电源端查，查到电笔不亮时，就找到了故障点。2.当负荷不平衡时，N线上有电流，在导线与周围存在这电磁感应电压在潮湿、线路密集的情况下，感应电压能达到150V甚至更高，但是此电压的能量非常小，接上负载后就自动消失了
3、三相负载失衡
危害、将会引起中线电流过大，甚至超过最大相电流，造成严重失衡，相线和中性线绝缘层易先老化。https://mp.toutiao.com/mp/agw/article_material/open_image/get?code=ZDlhYTcwOGNmODQxYzI1ZTRhZDZhYjk2MDZmZDU5ZjksMTc2NzQxMjI0NzQzOA==
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