Medium and high voltage switchgear

Abstract

The invention belongs to the field of switch cabinets, and particularly discloses a medium and high voltage switch cabinet, comprising a cable compartment, a busbar compartment, a circuit breaker compartment and a control compartment. A circuit breaker, an incoming line contact box and an outgoing line contact box are built in the circuit breaker compartment. A switch-on and switch-off mechanism is built in the circuit breaker, and the switch-on and switch-off is composed of an anti-bounce device, an electromagnetic driver, an insulating cylinder and a vacuum bubble, which are fixedly connected with each other on the axial direction. A piston of the anti-bounce device is provided with a damping hole, and an electric drainage device and a current blocking device, which communicate with eachother, the electric drainage device is triggered to perform electric drainage during switch-on to eliminate the promotion force of switch-on bounce of a moving contact of the circuit breaker, and thecurrent blocking device ensures that a damping medium flowing through the electric drainage device can only flow to a rodless cavity, so that the anti-bounce device absorbs the energy of the reversebounce of the moving contact. The anti-bounce device absorbs a part of energy during the switch-on of the moving contact of the circuit breaker, eliminates the promotion force for prompting the switch-on bounce and absorbs the bounce energy of the moving contact, so as to suppress the switch-on bounce of the moving contact of the circuit breaker, thereby avoiding the occurrence of switch-on bouncearcing.

Description

technical field [0001] The invention relates to a switchgear, in particular to a medium-high voltage switchgear suitable for reducing closing bounce and arcing, and belongs to the field of electric equipment. Background technique [0002] Switch cabinets are widely used in power plants, petroleum, chemical industry, metallurgy, textiles, high-rise buildings and other industries for power transmission, power distribution and power conversion. The switch cabinet is built with a circuit breaker for controlling the primary circuit on and off. During the application process of the switchgear, the circuit breaker often bounces when closing, resulting in bouncing arcing between the moving contact and the static contact of the circuit breaker, and the arc ablation makes the moving contact and static contact of the circuit breaker easy to be damaged , resulting in a short service life of the circuit breaker, requiring a lot of manpower and material resources to maintain the switchge...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a medium and high voltage switchgear to solve the technical problem that the medium and high voltage switchgear in the prior art is prone to closing bounce arcing when closing, and absorb the energy of the moving contact of the circuit breaker by setting a bulletproof device , inhibit the closing bounce of the moving contact of the circuit breaker, avoid the occurrence of closing bounce arcing, and improve the closing performance and safety of the switchgear

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