Current-limiting mechanism of breaker

Abstract

The invention relates to a current limiter of chopper, which comprises movable contact rod, stable contact rod with bended part, rotation axle, and central axle, wherein said current limiter comprises one clamper with one clamping pin axle fixed at side of movable contact rod and protruded, one axial pin whose two ends are fixed on rotation axle, and one compressing plate; the back of compressing plate is rotationally mounted on axial pin, while its belly is formed by one concave arc surface, while its front end is compressed on clamping pin; it comprises one torsion spring mounted on axial pin, while one end of spring contacts the back of compressing plate; when there is large accident current in circuit, the clamper can stop movable contactor back to form channel, or form arc to damage contactor, to limit and break accident current.

Description

technical field [0001] The invention relates to a current-limiting mechanism of a circuit breaker. When a large fault current occurs, it can quickly cut off the circuit and ensure that the fault current will not be turned on again, so as to play the role of current-limiting protection. Background technique [0002] The contact system of the circuit breaker can connect or break the circuit under the drive of the operating mechanism. At the same time, the circuit breaker is also equipped with a release. When the circuit is overloaded or short-circuited, the release can drive the operating mechanism to make dynamic and static contacts. The head is separated, the circuit is cut off, and it plays a protective role. However, the protective effect of the release is limited, because the action of the release is relatively slow. After the release operates, a series of mechanical transmission processes are required to separate the dynamic and static contacts. For particularly large fa...

AI Technical Summary

Problems solved by technology

However, once the moving and static contacts are separated, the electric repulsion force decreases thereupon. At this time, the operating mechanism has not had time to move, and the moving contact rod 2a falls back under the action of the spring 3a, and approaches the static contact rod 1a until it reaches At a certain distance, an arc will be generated between the moving and static contacts, which will not only affect the current limiting effect, but also cause serious burning of the contacts or even welding, causing the fault current to damage the load element

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