Must the ground fault protection of the incoming line frame circuit breaker be activated?
Thread Content
I have a question for everyone: Must the ground fault protection of the incoming line frame circuit breaker be activated? Can I exit? Is it safe? Last night, the circuit breaker tripped, indicating a fault ground protection activation at 500A. No problem was found, and after power was restored, it worked normally until now. Further inspections during the day also failed to locate the fault! Thank you!
The ground fault protection of the incoming line frame circuit breaker must be enabled; to ensure system safety, it is not recommended to disable it. If the ground fault protection trips, the cause of the fault should be thoroughly investigated; it cannot be ignored casually. Even after normal power supply is restored, the system still needs to be monitored and tested to prevent the occurrence of unknown issues again. Safety is the top priority. .
If no investment is made, it will trip at the next higher level, which is even more troublesome
The level above is the 10KV incoming line
Which one do you mean by your incoming circuit breaker? The main switch behind the transformer? So grounding doesn’t necessarily enable switching; for example, with Schneider’s grounded IG, the maximum value is IN, which is too small to allow switching, and the time available is at most 0.4 seconds, with no selectivity. I’m not very familiar with those from other brands; whether to invest depends on the calculations, from bottom to top.