Electricity exception protection circuit applied to circuit breaker

Abstract

The invention provides a power abnormal protection circuit applied to a circuit breaker, which comprises a power line sampling unit, a power supply unit, a state processing unit and an action executing unit; the power line sampling unit is used for collecting semaphore representing the power state of the circuit breaker from a power line arranged on the circuit breaker; the power supply unit acquires a real-time voltage from the power line, transforms the real-time voltage to a stable voltage, and supplies electricity to the protection circuit; a reference voltage is arranged on the state processing unit, and when the voltage of the semaphore is higher than the reference voltage, a trigger signal is produced; and the action executing unit produces protection movements according to the trigger signal transmitted by the state processing unit.

Description

technical field [0001] The present invention relates to an internal circuit of a circuit breaker, in particular to a circuit structure that is applied to a circuit breaker and takes corresponding protection actions in an abnormal state according to the state of the circuit breaker installed on the power line . Background technique [0002] For the power department, the switch and breaker equipment is an indispensable device for electricity safety and line switching. Generally speaking, the mission of the circuit breaker is to connect or disconnect the circuit. For this reason, in general, only one action mechanism can Realized, but from a safety point of view, the existing circuit breaker also adds some unnecessary auxiliary structures, such as an arc extinguishing mechanism, then the internal structure of the existing circuit breaker please refer to Figure 1A As shown, it includes: a box body 001, which is made of insulating and flame-retardant materials, and has the follo...

AI Technical Summary

Problems solved by technology

[0005] On the one hand, if the overcurrent problem occurs frequently, the electromagnetic tripper will often operate, which will cause its mechanical fatigue, and the overcurrent value of the overcurrent protection will become larger and larger, thus deviating from the initial standard , the reliability is reduced, so there is a great potential safety hazard;

[0006] On the other hand, since the power abnormalities generally include: overvoltage, overload and current imbalance, but current circuit breakers can only protect one of them, which is difficult to meet people's needs

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