A Bipolar Composite Longitudinal Magnetic Field Contact Structure for Vacuum Interrupter

Abstract

The invention provides a vacuum interrupter bipolar compound longitudinal magnetic field contact structure. The structure comprises an anode contact system and a cathode contact system, wherein the anode contact system and the cathode contact system are arranged in a vacuum interrupter. The anode contact system comprises a contact sheet and a magnetic conductive structure which is arranged on the back of the contact sheet and is provided with an opening on the single side. A conductive rod is connected with the contact sheet through a diversion structure and passes through the opening of the magnetic conductive structure. The diversion structure, the magnetic conductive structure and the contact sheet are fixed by welding. The cathode contact system and the anode contact system share the same structure. The contact sheets are oppositely arranged, and the opening direction of the magnetic conductive structure is opposite. The conductive rod, the contact sheets and the diversion structure form a conductive circuit. The magnetic conductive structure forms a magnetic conductive circuit. According to the structure provided by the invention, the longitudinal magnetic field strength in the vacuum interrupter can be improved; a strong longitudinal magnetic field area is increased; the longitudinal magnetic field of the existing vacuum interrupter is increased; the maximum arcing distance of vacuum arc is effectively improved; and the vacuum interrupter circuit resistance is low.

Description

technical field [0001] The invention belongs to the technical field of vacuum switches, and in particular relates to a bipolar compound longitudinal magnetic field contact structure of a vacuum interrupter. Background technique [0002] High-voltage vacuum circuit breaker is an important switchgear in power system because of its advantages of small size, simple structure, environment-friendly and maintenance-free. At present, in order to improve the breaking capability of the high-voltage vacuum interrupter, the vacuum arc is usually controlled by applying a magnetic field in the vacuum interrupter. In addition, in order to increase the rated current level of the high-voltage vacuum circuit breaker, it is necessary to reduce the loop resistance of the conductive part of the vacuum interrupter. In the prior art, a horseshoe-shaped longitudinal magnetic contact can effectively reduce the circuit resistance of the vacuum interrupter, and at the same time provide a strong longi...

AI Technical Summary

Problems solved by technology

However, there is a longitudinal magnetic field in the horseshoe-type longitudinal magnetic contacts of the vacuum interrupter to effectively control the longest arcing distance of the vacuum arc, that is, as the distance between the contacts increases, the longitudinal magnetic field between the contacts decreases continuously, and when When the contact opening distance exceeds a certain value, the vacuum arc cannot be effectively controlled by the longitudinal magnetic field, resulting in the loss of the breaking ability of the vacuum interrupter

The above-mentioned characteristics of the horseshoe-shaped longitudinal magnetic contact limit its application in high-voltage, large-opening vacuum interrupters

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