Happen "Resist" The situation is basically the closing operation and reclosing process. The dangers of such a large failure, for example, in case of an accident requires emergency backup power input, if the standby power switch on the circuit breaker to refuse, it will expand the accident. Judgment CNC Electric circuit breaker "Resist" the causes and treatment generally three steps.
1) Check before closing time refused whether caused by improper operation (such as control switches let go too fast, etc.), and then combined with a control switch once again.
2) If the closing is still not successful, check the electrical circuits of each part, so as to determine whether faulty electrical circuit. Check the project are: closing control power supply is normal; closing closing loop control circuit fuse and the fuse is good; closing of the contactor contacts is normal; the control switch to the "switch on" position, look at closing core action is normal.
3) If the normal electrical circuit breaker is still not closing, then to mechanical failure, should be discontinued breakers, report scheduling maintenance treatment.
After more than a preliminary examination can determine electrical connection, or mechanical failure. Common faults and mechanical failures of electrical circuits are described as follows.
A common fault electrically
If the closing operation before the red, green not lit, AC Contactors no power or control loop control has broken phenomenon. You can check whether the power and control of the entire control loop of the normal component, such as: operating voltage is normal, the fuse is blown, anti-hop relay is normal, the breaker auxiliary contact is good contact and so on.
When the operation switch on the green light flashes, and the red light does not shine, instrument no indication, horn sound, mechanical breaker points, closing position indicator is still in the OFF position, then the position of the operating handle position and the circuit breaker does not correspond breaker is not closed. The common causes are: closing the loop blown fuse or bad; closing the contactor is not activated; closing coil failure.
When the operation after closing the circuit breaker, the green light is off, the red light goes off after momentary bright, green light flashes and there is also the horn sound, indicating that the circuit breaker is closed and then automatically tripped. The reason may be caused by a circuit breaker protection combined current transformer mechanical failure or circuit breaker tripping the circuit breaker can not be maintained in the closing state on the fault line.
If the green light flashes when the operation switch on or off, the red light does not shine, but there is indication meter, mechanical points, closing position indicator in the closing position, indicating the circuit breaker is closed. Possible causes are poor contact breaker auxiliary contacts, such as normally closed contact is not disconnected, normally open contact not closed, resulting in green and red light does not flash light; also may be electri calmete closing or closing red burn circuit break .
