Double-break vacuum circuit breaker for medium-voltage gas insulated switchgear

Abstract

The invention discloses a double-break vacuum circuit breaker for a medium-voltage gas insulated switchgear. The double-breaker vacuum circuit breaker comprises an operating mechanism, an enclosed pole post assembly and a corrugated pipe assembly, wherein the enclosed pole post assembly comprises an upper vacuum arc extinguishing mechanism and a lower vacuum arc extinguishing mechanism which are arranged in parallel, the upper vacuum arc extinguishing mechanism and the lower vacuum arc extinguishing mechanism respectively comprises an insulation shell, the insulation shell is arranged on a static sealing flange, a vacuum arc extinguishing chamber and an insulation pull rod assembly are arranged in the insulation shell, one end of the insulation pull rod assembly is connected with a movablecontact of the vacuum arc extinguishing chamber, and a static contact of the vacuum arc extinguishing chamber arranged in the upper vacuum arc extinguishing mechanism is connected with a static contact of the vacuum arc extinguishing chamber arranged in the lower vacuum arc extinguishing mechanism. The two vacuum arc extinguishing chambers connected in series are driven by the operating mechanism, the restrike probability of the vacuum circuit breaker during switching on and switching off a capacitor bank is effectively reduced, and the safety and the reliability of power grid running are improved.

Description

technical field [0001] The invention relates to the technical field of vacuum circuit breakers, in particular to a double-break vacuum circuit breaker for medium-voltage gas-insulated switchgear. Background technique [0002] 12kV-40.5kV gas insulated switchgear is a medium voltage power transmission and distribution switchgear in which the primary main circuit is sealed and installed in a closed gas box, and then filled with appropriate insulating gas as the insulating medium in the gas box. Due to its small size, safety and maintenance-free and many other advantages, this type of product has become a market hotspot in the field of medium-voltage power transmission and distribution in recent years. Most of the medium-voltage gas-insulated switchgears use vacuum circuit breakers as the main switchgear. Vacuum circuit breakers have been widely used in various power transmission and distribution places due to their many advantages such as adapting to frequent operations, maint...

AI Technical Summary

Problems solved by technology

[0003] The reactive power compensation of the power system has an indispensable significance for the power factor of the power grid. When the existing vacuum circuit breaker switches the capacitive load of the capacitor bank used as reactive power compensation, there will be a certain probability of re-breakdown. The resulting overvoltage will cause frequent accidents to the capacitor bank equipment, seriously affecting the operation of the power system, and even causing casualties, which limits the application of vacuum circuit breakers in medium-voltage gas-insulated switchgear, and is not conducive to the promotion and application of this product

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