A stroke-controllable circuit breaker

Abstract

The invention discloses a stroke-controllable circuit breaker which comprises an arc extinguish chamber and a driving mechanism, wherein static contacts are arranged inside the upper end of the arc extinguish chamber; moving contacts are correspondingly arranged right below the static contacts at intervals; pull rods are connected with the lower parts of the moving contacts; the driving mechanism is elastically connected with driving rods and used for driving the pull rods to move upwards and downwards, thereby driving the moving contacts to be in contact with or move away from the static contacts. The stroke-controllable circuit breaker has great application values as the abrasion degree of contacts of a circuit breaker is effectively reduced, the closure and opening time of the circuit breaker is shortened and the property of the circuit breaker is improved.

Description

technical field [0001] The invention relates to the field of high-voltage circuit breakers, in particular to a circuit breaker with controllable stroke. Background technique [0002] A circuit breaker is generally composed of an arc extinguishing chamber and a driving mechanism. The driving mechanism drives the moving contact to contact or move away from the static contact through the intermediate transmission mechanism, so as to realize the closing and opening movement of the circuit breaker. The driving mechanism and the transmission mechanism of the circuit breaker Most of them are directly rigidly connected, and the collision between the moving contact and the static contact is violent, which intensifies the wear between the two, causing the movement stroke of the moving contact to change, and the mechanical vibration of the circuit breaker itself and the fatigue of the spring will change the dynamic contact. The stroke of the contact, in the existing public technology, ...

AI Technical Summary

Problems solved by technology

[0002] A circuit breaker is generally composed of an arc extinguishing chamber and a driving mechanism. The driving mechanism drives the moving contact to contact or move away from the static contact through the intermediate transmission mechanism, so as to realize the closing and opening movement of the circuit breaker. The driving mechanism and the transmission mechanism of the circuit breaker Most of them are directly rigidly connected, and the collision between the moving contact and the static contact is violent, which intensifies the wear between the two, causing the movement stroke of the moving contact to change, and the mechanical vibration of the circuit breaker itself and the fatigue of the spring will change the dynamic contact. The stroke of the contact, in the existing public technology, the overtravel of the moving contact of the circuit breaker is not easy to detect and adjust. When the change of the stroke of the moving contact reaches a certain level, it will affect the reliability of the closing and opening of the circuit breaker, resulting in The closing is not in place, the arcing time is too long, and even the contacts are burned

Especially for multi-phase circuit breakers, the action strokes of the moving contacts between the phases are inconsistent, which will cause the dispersion of the closing and opening movement time of each phase of the circuit breaker to be too large, and the closing and opening time is too long, resulting in deterioration of breaking performance or even breaking failure with serious consequences

Furthermore, due to technical defects in the design of the transmission mechanism, the operation synchronization between each phase cannot be guaranteed, which increases the closing and opening time of the circuit breaker.

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