A high-voltage double-break circuit breaker

Abstract

The invention discloses a high-voltage double-break circuit breaker. The high-voltage double-break circuit breaker comprises circuit breaker casings and driving mechanisms, wherein two arc extinguishing chambers are symmetrically arranged in the circuit breaker in a left and right manner, a certain distance is formed between the arc extinguishing chambers, movable cover-plate ends of the arc extinguishing chambers are oppositely arranged, a fixed contact and a movable contact are arranged in each arc extinguishing chamber, the movable contacts are electrically connected with each other and are connected with one ends of connecting-rod mechanisms, and the fixed contacts are led out of the arc extinguishing chambers; the driving mechanisms are connected with the other ends of the connecting-rod mechanisms at the same position through insulated tension rods, the driving mechanisms drive the insulated tension rods to move up and down so as to drive the connecting-rod mechanisms to synchronously move, and further the gathering movement and the separating movement of the movable contacts and the fixed contacts are synchronously realized, wherein the leading-out terminals of the two fixed contacts are used as the circuit access terminals of the circuit breaker. The high-voltage double-break circuit breaker disclosed by the invention solves the problem that the switching voltage of vacuum circuit breakers is not high, and besides, the time for opening or closing a brake is shortened; the mechanical structure is simple, and the reliability of the circuit breaker is improved.

Description

technical field [0001] The invention relates to a high-voltage vacuum circuit breaker, in particular to a high-voltage double-break circuit breaker. Background technique [0002] With the continuous and rapid development of my country's economy, the demand for electricity in the whole society is also increasing, and the capacity of the power grid continues to expand, forcing the voltage level to continue to increase. At present, most high-voltage transmission lines in China directly use 126kV voltage level, and high-voltage circuit breakers get a lot of use. Due to the excellent arc extinguishing performance, SF 6 Circuit breakers firmly occupy the application market of this voltage level, but SF 6 As a typical greenhouse gas, it will be completely banned in the near future, so it is urgent to find an effective substitute, and replace SF with vacuum circuit breakers 6 Circuit breakers have become a new direction of development. At present, vacuum circuit breakers can only...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above technical problems, the present invention discloses a high-voltage double-break circuit breaker, which adopts a double-interrupter structure and a specially designed operating mechanism, which solves the problem of low breaking voltage of vacuum circuit breakers and effectively reduces closing and opening time, realize the synchronous operation of the two arc extinguishing chambers, the opening speed is fast, the breaking voltage level is high, the mechanical structure is simple, the reliability of the circuit breaker is improved, and the production cost is low

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