Contacts and vacuum interrupter with fixed fracture and short-circuit current breaking capability

Abstract

A contact with a fixed fracture and a short-circuit current breaking capability and a vacuum interrupter. The contact includes a set of fixed fracture contacts and a set of movable fracture contacts. The movable fracture contacts are in the fixed fracture state in the opening state. The inside of the contact; the vacuum interrupter includes a contact with a fixed fracture and a short-circuit current breaking capability, a housing and a shield; the invention solves the problem of the existing composite magnetic field contact structure and other designs for capacitive current breaking The complex structure of the vacuum interrupter and the lack of magnetic field control of the vacuum arc; the invention realizes the electric field shielding and protection of the movable fracture contact by the fixed fracture contact, and avoids the movable fracture contact The impact of the defects formed on the surface of the head on the breakdown; the invention separates the breaking function and the insulating function, realizes the breaking function with the composite magnetic field contact, and realizes the insulating function with the fixed contact, which can not only break the short-circuit current, but also be used for Switching capacitive current, such as reactive power compensation fields such as capacitor bank switching.

Description

technical field [0001] The invention belongs to the technical field of high-current vacuum circuit breakers, and in particular relates to a contact with a fixed fracture and capable of breaking short-circuit currents and a vacuum interrupter, which can be used for capacitor bank switching and has short-circuit current breaking capabilities. Background technique [0002] The application of vacuum circuit breakers in the entire power system develops rapidly, but with the development of power systems, the requirements for vacuum circuit breakers are also constantly increasing, especially the switching of capacitor banks. In the medium-voltage power distribution system, a high-frequency inrush current of 4250 Hz and 20 kA will be generated during switching of the capacitor bank, and its pre-breakdown arc will locally ablate the surface of the contact and cause the contact to weld. When breaking the capacitor bank, the breaking current can reach hundreds of amperes. At this time,...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a contact with a fixed fracture and a short-circuit current breaking capability and a vacuum interrupter, which solves the problems of the existing compound magnetic field contact structure and other problems for capacitors. The structure of the vacuum interrupter designed for permanent current breaking is too complicated, and there are problems such as the lack of composite magnetic field control of the vacuum arc.

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