Circuit breaker

Abstract

The invention relates to a circuit breaker, and specifically relates to an improvement of a tripping mechanism of the circuit breaker. A moving contact is rapidly repelled by utilizing the Holm forceand the Lorentz force generated by the short-circuit current; when the moving contact is repelled, a tripping combined structure is designed for transmission by utilizing the repelling movement, so that a tripping half shaft and a tripping piece are directly unbuckled, the mechanism response time is shortened, the capability of cutting off the fault current is improved, and the impact of the faultcurrent on the system is reduced. In addition, the contact is prevented from being closed with a static contact again after being repelled by using a connecting rod transmission direct tripping mode,the arc reignition is prevented, the burning loss of the contact is reduced, and the arc extinguishing difficulty is reduced.

Description

technical field [0001] The invention relates to a circuit breaker, and more particularly relates to the improvement of the tripping mechanism of the circuit breaker. Background technique [0002] The circuit breaker is a switching device widely used in the power distribution system. When the circuit is overloaded, short-circuited, or under-voltage, the circuit breaker needs to be able to quickly cut off the circuit to avoid burning the components under excessive current, so usually The circuit breaker has a quick trip mechanism to quickly break the circuit, and the speed of tripping and tripping directly affects the ability of the circuit breaker to cut off the fault current. Thermal magnetic release is a commonly used tripping mechanism in the field of circuit breakers at present, but when a short-circuit current occurs in the circuit, the yoke of the thermal magnetic release needs to be magnetized after a certain period of time to generate magnetic force, and then attract ...

AI Technical Summary

Problems solved by technology

Thermal magnetic release is a commonly used tripping mechanism in the field of circuit breakers at present, but when a short-circuit current occurs in the circuit, the yoke of the thermal magnetic release needs to be magnetized after a certain period of time to generate magnetic force, and then attract the armature to move. Finally, by hitting the lock mechanism to release the switch to cut off the fault current, it not only needs to go through two-stage mechanical transmission, but also the distance between the armature and the yoke of the thermal magnetic release is relatively long in the conventional technology (the air gap between the armature and the yoke Large), the initial suction force of the yoke to the armature is relatively small, and the action of the armature is not fast enough, so the response speed of the thermomagnetic release is relatively slow, resulting in a longer fault current existence time and affecting system safety

In addition, thermal magnetic releases usually have many parts and complex structures.

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