Contact operating mechanism of vacuum circuit breaker

Abstract

The invention discloses a contact operating mechanism of a vacuum circuit breaker. The contact operating mechanism comprises an arc extinguishing chamber, one side of the arc extinguishing chamber isprovided with a static contact through a static conducting rod, the other side of the arc extinguishing chamber is provided with a moving contact through a moving conducting rod, and the moving conducting rod comprises a driving rod connected with a corrugated sleeve. A telescopic cavity is concentrically nested in the driving rod, a driven rod is installed in the telescopic cavity, and the drivenrod is connected with the moving contact. One end of the driving rod penetrates through the arc extinguishing chamber and is connected with a mechanical driving structure, and the driven rod extendsto the outer side of the arc extinguishing chamber along the telescopic cavity and is connected with the mechanical driving structure. The driving rod and the driven rod are firstly driven by the mechanical driving structure to integrally move to complete a preliminary opening process, and then the driven rod is driven by the mechanical driving structure to move towards the outer side of the arc extinguishing chamber along the telescopic cavity on the driving rod, so that the opening distance between the contacts is increased.

Description

technical field [0001] The invention relates to the technical field of vacuum circuit breakers, in particular to a contact operating mechanism of a vacuum circuit breaker. Background technique [0002] With the domestic vacuum interrupter and vacuum circuit breaker technology becoming more and more mature, the output of vacuum circuit breakers in my country has increased significantly every year. Compared with SF6 circuit breakers, the biggest advantage of vacuum circuit breakers is that there is no risk of gas leakage and will not cause environmental pollution. . At the same time, it has many advantages such as good arc extinguishing performance, long electrical life, and high operational reliability. Therefore, vacuum circuit breakers have been widely used by many manufacturers and users in various industries due to their excellent performance. [0003] The vacuum circuit breaker mainly consists of three parts: vacuum interrupter, electromagnetic or spring operating mecha...

AI Technical Summary

Problems solved by technology

However, if the opening distance is too small, it will affect the breaking capacity and withstand voltage level

If the opening distance is too large, although it can increase the withstand voltage level, it will reduce the service life of the bellows of the vacuum interrupter. Therefore, in the design, the opening distance should be selected as small as possible under the condition of meeting the operating pressure resistance requirements.

[0006] However, due to the small opening distance of the contacts, arcing may still occur between the contacts, causing the disconnected line to be connected and causing hazards

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