电工的必备基础知识

都是凤舞天骄

1、左零右火
2、三相五线制用颜色黄、绿、红、淡蓝色分别表示U、V、W、N 保护接地线双颜色（PE）
3、变压器在运行中，变压器各相电流不应超过额定电流；最大不平衡电流不得超过额定电流的25%。变压器投入运行后应定期进行检修。
4、同一台变压器供电的系统中，不宜保护接地和保护接零混用。
5、电压互感器二次线圈的额定电压一般为100V。
6、电压互感器的二次侧在工作时不得短路。因短路时将产生很大的短路电流，有可能烧坏互感器，为此电压互感器的一次，二次侧都装设熔断器进行保护。
7、电压互感器的二次侧有一端必须接地。这是为了防止一，二次线圈绝缘击穿时，一次高压窜入二次侧，危及人身及设备的安全。












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www

楼主太会说了，字字句句都在理

无烟蚊香

笑不活了，评论区比正文还精彩
已转发给朋友，一起快乐一下

joblog

说得对！狠狠赞同，没毛病～

幸福快乐

赞同 + 10086，没毛病，完全没毛病

meizu12

求个链接 / 教程，楼主好人一生平安～

微笑人生

谁懂啊！真的被戳中笑点 / 泪点了

wei4330

学到了学到了，这波分享太实用啦！

听雨

画面感太强了，仿佛身临其境！

ge芃生

水贴也要有仪式感，我先来打卡～