The reason of the circuit breaker skipping trip fault

The reason and treatment method of circuit breaker's leapfrog tripping fault

time: 2015-07-21-22:27:51 EDIT: Electrician column: Electrician summary

Guide: About the circuit breaker leapfrog tripping fault occurrence reason, circuit breaker "refused to jump" serious threat to the system security, circuit breaker refused to move, resulting in a circuit breaker tripping, called "Leapfrog Trip", here summarizes the circuit breaker Leapfrog trip treatment method.

Circuit Breaker Leapfrog tripping fault :
The "Refuse jump" of the circuit breaker is very dangerous to the system safe operation, once a unit fails, the circuit breaker refuses to move, will cause the last class breaker tripping, called "Leapfrog Trip".

the treatment method of the circuit breaker skipping trip fault :

First, according to the accident phenomenon, can determine whether the circuit breaker "refused to jump" accident.

"refused to jump" fault characteristics are: The circuit light word card light, signal off card display protection action, but the circuit is still bright red, the upper level of backup protection such as the main transformer compound voltage overcurrent, circuit breaker failure protection and other actions.

In some cases, backup protection can not be timely action, the component will have a short-time ammeter indicator value increases, the voltmeter indicator value is lowered, the power meter pointer shaking, the main transformer issued a heavy hum abnormal sound, and the corresponding circuit breaker is still in the closing position.

Second, determine the fault of the circuit breaker, should be manually cut off immediately.

1, when not yet to ascertain the fault breaker before the main transformer power supply total Circuit Breaker ammeter indicator value hit foot, abnormal sound strong, should first pull off the power supply total circuit breaker, in case the main transformer burned.

2, when the superior backup protection action caused by power outage, if there is a shunt protection action, but the circuit breaker does not trip, should be opened the circuit breaker refused to move, to restore the power circuit breaker; If the detection of each shunt protection is not action (also may be protection against the card), you should check the power outage within the scope of the device is not , close the power circuit breaker, try to send each shunt circuit breaker.

When the power circuit breaker is tripped again when it is sent to a shunt, it is possible to ascertain that the circuit breaker is a fault (skip) circuit breaker. This should be isolated while restoring power to other loops.

3, in the inspection "refused to jump" circuit breaker in addition to the general electrical fault can be quickly excluded (such as the control of the power supply voltage is too low, or the control circuit fuse bad contact, fuse fuse, etc.), on a temporary difficult to deal with electrical or mechanical failure, should be linked to the scheduling, as a stop, turn maintenance treatment.

The circuit breaker should first check the protection and the action of the circuit breaker after skipping tripping.

If the protection action, the circuit breaker refused to trip caused by leapfrog, you should pull off the circuit breaker on both sides of the isolation switch, the other non-fault line transmission.

If it is because the protection does not act to leapfrog, then the circuit breaker should be disconnected, and then one-by-one transmission line test, found fault line, the line will be cut off, open the circuit breaker on both sides of the isolation switch, and then other non-fault lines to power transmission.

Finally, find out why the circuit breaker refuses to trip or protect.

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The reason of the circuit breaker skipping trip fault