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如何用万用表测量零地混接
更新时间: 2020-09-16 00:00:00  

1、通电测量,找出相线:接通电源,用万用表的交流电压档测对地电压,电压接近220V的为火线,电压接近0V的为零线,若零线对地电压有几V甚至十几V,则基本可判断零地没有混接。若电压为零,则断开总电源,用万用表电阻档测量零地之间阻值;

2、有功电能表,只要火线有电流流过电表就会转,零地混接不会比正常转得快。在异常情况下可能出现零地混接转得快,即有电器对地漏电,对比与同样是电器对地漏电,零地没有混接,且地线接地不良甚至没接地,此时漏电量会减少,但此时电器漏电对人的危协程度也会很高。

关键词: 何用 测量

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