How to use a digital clamp meter to judge whether there is a problem with the residual current action protector itself
If the residual current action protector cannot be put into operation or is frequently protected, a leakage current clamp meter can be used at the distribution transformer to clamp the three phase wires and neutral wires on the outlet side of the AC contactor or leakage circuit breaker to activate the residual current action. The protector is forcibly put into operation. If the displayed value of the leakage current clamp meter is greater than 300mA at this time, it proves that the residual current operation protector is good. At this time, the leakage current clamp meter should be used to determine which phase is leaking; otherwise, it should be repaired Or replace the residual current action protector.
