191问答库 > 超市用电380，220V电源。380V电主其要做什么用途？三根火线就称380V吗？其中单根每组为2

超市用电380，220V电源。380V电主其要做什么用途？三根火线就称380V吗？其中单根每组为2

2025-03-16 05:21:56
推荐回答（1个）
回答1：

差不多吧！三相交流电是互差120°的正弦波，单相220V也就是一根相线对零线，称相电压。因为有了120°的角度差，所以每两相之间也有电压为220V×√3可以作图计算，结果就是380左右称线电压，所以380是三相没有零线，220就是单相了。

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