Circuit Breaker Troubleshooting

Inputs trip
1) Three-phase power lines, including the zero line is not in the same direction through the zero-sequence current transformer, correct wiring can be.
2) Install leakage circuit breakers and earth leakage breaker is not installed in the electrical circuit is connected, you can separate the two circuits.
3) there is a fire, a line to load, so the load can be eliminated.
4) through the work of zero sequence current transformer neutral grounding duplicate phenomenon, should eliminate duplication grounded.
5) leakage circuit breaker itself is faulty and should be replaced.
Malfunction
1) over-voltage caused. Such as occurs when the line can cause over-voltage circuit breakers, then you can use delayed or no action impulse voltage leakage Circuit breaker can also be installed between the contacts RC snubber circuit overvoltage suppression, but also in line inputs overvoltage absorption device.
2) electromagnetic interference. Such as nearby magnetic devices or high-power electrical equipment open stop leakage circuit breaker should be adjusted to the installation location, away from such electrical components.
3) Circulation affected. If the two transformers operating in parallel, have their own ground, because the two can not be exactly equal to the impedance of the transformer, it will generate in the ground circulation, causing circuit breakers, remove a grounding cable. Furthermore, two parallel circuits by the same transformer of the same load, the current in the two circuits are not identical, circulation may also occur, so two loops should be run separately.
4) the zero line of the insulation resistance decreases. When the zero line of the insulation resistance is reduced, if the three-phase unbalanced load, the zero line will appear relatively large current, and by way of people to go to other branches, so that the earth leakage circuit breaker on each of the leakage current can occur the circuit breaker malfunction.
5) Improper grounding. Repeat as neutral ground, will cause leakage circuit breaker malfunction.
6) the impact of overload or short circuit. If leakage circuit breaker also has short-circuit protection, over current protection, when overcurrent trip setting current size inappropriate malfunction occurs, then adjust the setting current value.