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三相四线制什么时候改为三相五线制

2025-02-12 04:04:51

推荐回答（1个）

回答1：

三相四线制，是A，B，C三颗电源线和一颗地线。三相五相制在三相四线制的基础上多一颗零线（最低电位点）多用于自动化控制的设备。三相五线制的设备使用三相四线制的电源设备外壳的地线与电源地线连接如设备运行正常就没问题如出现安全保护状态还要找到电网的最低电位（零线）与设备上的零线连接。

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