1. In the TN-CS system, if the detection circuit is between the PEN line and the L line of the TN-C section, the leakage circuit on the PE line of the TN-S section will refuse to operate;
2. In the TN-S system, since the circuit installer puts the N line into the switch, if the N line is broken and there is leakage on the L line, the leakage circuit breaker will appear to be rejected because the detection circuit will not detect the leakage signal. ;
3. In the TN-CS system, since the circuit installer connects the N line and the PE line together, if leakage occurs, the leakage circuit breaker will appear to reject the action;
4. When installing and using, the sensitivity of the leakage circuit breaker is too low, and the actual leakage value does not reach the specified value, it will also refuse to operate;
The main causes of malfunction of the leakage circuit breaker are as follows:
1. In the TN-CS system, the circuit installer reverses the PE line and the N line, causing malfunctions;
2. In the three-phase four-wire system of lighting and power, the three-pole leakage circuit breaker is selected incorrectly, and the zero line of the load directly causes the malfunction on the power supply side of the protector;
3. There is a high-power electric appliance near the leakage protector. When the electrical appliance is opened or closed, electromagnetic interference may cause malfunction.
4. The insulation resistance of the phase line and the neutral line is too low, and some of the current leaks to the earth through the leakage place, so that the current vector of the zero-sequence current transformer and the non-zero cause the circuit to malfunction when the circuit is normal;
5. When the PE line of the electrical equipment casing is connected to the working neutral line, it may cause a malfunction;
6. The three-phase power line through the three-phase leakage protector does not pass the zero-sequence transformer in the same direction, resulting in malfunction;
7. When installing and using, the sensitivity of the leakage circuit breaker will be too high and it will malfunction.
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