How to use a digital clamp meter to determine which phase line is leaking
At the distribution transformer, disconnect the neutral wire on the outlet side of the AC contactor that controls the low-voltage line, and then install the removed fuse core on one of the phases, and measure the phase with a leakage current clamp meter , the measured display value is the leakage current value of the phase. In the same way, measure the leakage current values of the remaining phases in turn.
In order to prevent the presence of phase line grounding on the line (such as someone using one-line-one-ground method to steal electricity, etc.) and damage the meter due to high current, the leakage current clamp meter should be placed on the maximum range during detection; if the displayed value is small, Then switch the leakage current clamp meter range to milliamp measurement.
