Vacuum switch tube

Abstract

The invention discloses a vacuum switch tube, comprising a first electric conduction pole and a second electric conduction pole which are respectively provided with a first contact and a second contact. The two contacts are sealed inside a vacuum tube face to face with each other; a convex hemispheroid is arranged at the front end of the first contact; and the main body of the second contact is acircular contact head which matches with front end of the first contact. The first contact is composed of a first electric conduction assembly and a first magnetic conduction assembly, which extend along the same direction and are in abuttal joint with one another. The first electric conduction assembly and the first magnetic conduction assembly of the first contact are matched like Yin-Yang fishin shape. The second contact comprises a second electric conduction assembly and a second magnetic conduction assembly which make up the main body of the second contact. The first magnetic conductionassembly of the first contact and the second magnetic conduction assembly of the second contact are anti-symmetrically arranged. The vacuum switch tube can reduce restrike possibility at the time of voltage disjunction, reduce arc voltage and realize effective arc extinguishing, thus satisfying the requirement of high voltage disjunction.

Description

technical field [0001] The invention relates to a vacuum switch tube, in particular to a vacuum switch tube with opposite contacts in an arc-extinguishing chamber, which belongs to the field of electrical technology. Background technique [0002] Switching equipment is a device that must be used in the circuit, and it plays the role of closing and breaking the circuit. Arc extinguishing is required during the breaking process of the switch contacts, so that the contacts can be separated decisively and prevent the arc from increasing the temperature of the switch and causing the loss of the switch. Vacuum switches are widely used in power circuits due to their small gap, high withstand voltage capability, low arc voltage, high breaking current capability, low electrical wear and high electrical life. . [0003] The core component of the vacuum switch tube is the vacuum interrupter in the housing. The performance of the contacts inside the vacuum interrupter directly determ...

AI Technical Summary

Problems solved by technology

[0004] The defects in the existing technology are: due to the limitation of the structural shape, it is often difficult for the vacuum switch tube to form a good longitudinal magnetic field for arc suppression, and it is difficult to solve the problems of electric field concentration, insufficient withstand voltage and high possibility of re-ignition during high-voltage breaking. Problem: For high-voltage circuits, only 36 kV voltage breaking can be achieved. For higher voltage circuits, especially 72 kV high voltage, there is currently no vacuum switching tube structure that can meet the requirements of effective arc extinguishing during breaking.

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