Circuit breakers (circuit breakers) are switches that can engage, carry and break the current under normal circuit conditions and can close and carry and cut off the current under abnormal circuit conditions within the specified time. Device. Circuit breakers can be used to distribute power, start asynchronous motors infrequently, protect power lines and motors, etc., and automatically cut off the circuit when they are severely overloaded, shorted, undervoltage, etc. Their function is equivalent to a fuse switch With overheat relay and other combinations. And in breaking the fault current generally do not need to change parts. At present, it has been widely used. Breaker according to their use is divided into high-voltage circuit breakers, and low-voltage circuit breakers, high and low voltage line division is relatively vague, generally more than 3kV called high-voltage electrical appliances.
The idea of ​​a universal circuit breaker, often referred to as a frame circuit breaker, is still commonplace because it is wrapped in a single frame. Universal circuit breakers sometimes occur during the main contact does not close or open during the closure of their own failure, resulting in some unnecessary damage. Study the reason, may have the following points:
(1) As the release coil often through high current, causing the coil overheating, causing unstable work. (2) As the relay under high voltage for a long time, resulting in contact surface oxidation, contact resistance becomes larger, the contact can not be properly connected to work.
(3) As the stator and rotor in the motor are dislocated and rubbed against each other, a large amount of heat is generated, causing the motor speed to be unstable or even stalling, resulting in the omnipotent circuit breaker being unable to work normally.
Common troubleshooting methods are the following:
1. Undervoltage release noise
Undervoltage release often work abnormal noise after a period of time, ranging from disturbing, while burning the coil, it is necessary to regularly remove the iron core surface of the oil and dust, found short-circuit ring fracture to be replaced. Should also adjust the undervoltage release spring tension to the core and armature air gap meet the requirements so far.
2 miniature motor burned
Stroke switch failure, will cause the electric motor operating mechanism in the miniature motor burned. Such as when the need to use the electric operating mechanism to close the circuit breaker, press the close button, the motor power supply circuit connected to the motor rotation, after the completion of the mechanism of energy storage or closing, the trip switch should be off micro-motor power supply circuit, However, due to the trip switch failure can not be disconnected, the motor will run overheating and burned for a long time.
3. Insulation caused by short circuit
If the circuit breaker is used for a long time, the insulation performance will gradually deteriorate. If it is not properly maintained at ordinary times, dust accumulation and moisture erosion on the surface of the insulation parts will accelerate the insulation aging and may cause phase-to-phase or relative Short circuit. Therefore, to keep the insulation surface clean to prevent deterioration of insulation performance, in order to extend the service life of circuit breakers.
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