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一起了解变频器引起漏保跳闸的原因

浏览量:   来源:www.sdbczdh.com  作者:宝川变频器

山东变频器维修:这是因为变频器的输出波形含有高次谐波,而电机及变频器与电机间的电缆会产生泄漏电流,该泄漏电流比工频驱动电机时大了许多,所以产生该现象.

Maintenance of Shandong Inverter: This is because the output waveform of the converter contains high-order harmonics, and leakage current will occur between the motor and the cable between the converter and the motor. The leakage current is much larger than that when the power frequency drives the motor, so this phenomenon occurs.

变频器操作输出侧的漏电流大约为工频操作时的3倍多,外加电动机等漏电流,选择漏电保护器的动作电流应该大于工频时漏电流的10倍。使用变频器的地方不适合采用具有漏电保护功能的保护开关(断路器)。因为变频器的输出存在高次谐波,如果不是采用的专用变频电缆和变频电机,那么泄漏电流是不可避免的,往往就会超过30毫安,使漏电保护跳闸。

The leakage current of the output side of the converter is about three times as much as that of the power frequency operation. When the leakage current of the motor is applied, the action current of the leakage protector should be 10 times as much as that of the power frequency operation. Where the frequency converter is used, the protective switch (circuit breaker) with leakage protection function is not suitable. Because the output of the converter has high harmonics, if it is not the special frequency conversion cable and motor, then leakage current is inevitable, often more than 30 mA, so that leakage protection trips.

文章来源:http://www.sdbczdh.com