Circuit breaker

Abstract

The invention belongs to the field of middle-high voltage switches, and particularly discloses a circuit breaker. The circuit breaker comprises a single-pole switch, wherein the single-pole switch comprises a vacuum bubble, an insulating cylinder, an electromagnetic driver and a bounce eliminating device which are axially connected; the bounce eliminating device comprises a cylinder body, and a piston, a flow discharging mechanism, a flow choking mechanism and a flow discharging channel which are positioned in the cylinder body; the flow discharging mechanism is arranged in the upper end partof the piston, a contact discharging rod of the flow discharging mechanism protrudes out of the upper end surface of the piston and extends into a rod cavity, and the contact discharging rod is suitable for impacting an end cover of the rod cavity to trigger the flow discharging mechanism to discharge flow, so that a driving force which is generated by a damping medium in the rod cavity at the tail end of the stroke and enables a moving contact to bounce reversely is eliminated; the flow choking mechanism is arranged in the lower end part of the piston; and the flow discharging channel is arranged in the piston, and the flow discharging mechanism is communicated with the flow choking mechanism through the flow discharging channel, so that a damping medium in a rodless cavity can only flowinto the rod cavity through a damping hole in the piston, the bounce eliminating device is enabled to further absorb energy of reverse bounce of the moving contact after closing, and closing bounce arcing of the circuit breaker is effectively avoided.

Description

technical field [0001] The invention relates to a medium and high voltage switch, in particular to a circuit breaker suitable for medium and high voltage, and belongs to the field of electric equipment. Background technique [0002] As a kind of switchgear, the circuit breaker is used to control the on and off of the medium and high voltage primary circuits. At present, higher requirements are put forward for the closing performance of the circuit breaker, such as shorter closing time and no arcing, especially Closing arc. The circuit breaker has a built-in vacuum bubble with arc extinguishing function. When closing, the high-speed moving contact of the vacuum bubble collides with the static contact to achieve closing, but the high-speed moving contact bounces after the collision, and bounces in the opposite direction at an instantaneous speed close to the closing time, resulting in The moving contact is far away from the static contact, and closing bounce arcing often occ...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a circuit breaker to solve the technical problems of circuit breakers in the prior art that are prone to closing, bouncing and arcing, and vacuum bubbles are easily damaged.

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