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使用钳型电流表应注意哪些问题?

问答题
2022-01-04 23:53
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正确答案

应注意以下问题:
①选择合适的量程,防止表针冲击损坏。
②测量过程中不准切换量程档,因切换中会造成瞬间二次回路,感应出的高电压有可能将绕组的层间或匝间绝缘击穿。
③测量三相交流电流时,钳住一相读数为本相导线电流,钳住两相导线读数为两相电流的代数和为第三相的线电流值,钳住三相导线时,如果三相平衡读数应为零,若有读数表示三相电流不平衡。
另外,在安全方面应注意:
①不允许超出绝缘规定的电压。
②测量高压应带绝缘手套并有人监护。
③高压回路测量禁止用导线另接电流表,电流表必须固定在钳子上。
④低压回路测量允许另外接电流表。


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使用钳型电流表应注意哪些问题?
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