Novel longitudinal magnetic contact system with embedded magnetism gathering ring and reverse contact cup

Abstract

The invention designs a novel longitudinal magnetic contact system with an embedded magnetism gathering ring and a reverse contact cup. The novel longitudinal magnetic contact system is composed of aconducting rod, an external contact cup, a contact piece, the embedded magnetism gathering ring and the embedded reverse contact cup. The embedded magnetism gathering ring is coaxially and tightly connected with the external static contact cup and the contact piece; a spiral groove opposite to the external contact cup in direction is formed in the cup wall of the embedded reverse contact cup, andthe embedded reverse contact cup is coaxially and tightly connected with the external moving contact cup and the contact piece. According to the novel longitudinal magnetic contact system, through theintroduction of the magnetism gathering ring and the reverse contact cup and the optimization design of the contact structure, on the basis of improving the longitudinal magnetic field of the contactgap current at the peak moment, the residual longitudinal magnetic field in the center of the contact is effectively weakened, the influence of the residual magnetism on residual plasma diffusion isreduced, and the recovery of the dielectric strength of the contact gap after arc and the improvement of the breaking capacity of the contact are facilitated. In addition, the newly designed contact system is simple in structure, easy to assemble, high in mechanical strength and beneficial to popularization and application in actual production.

Description

Technical field [0001] The invention relates to a novel longitudinal magnetic contact system of a vacuum interrupter with an embedded magnetic focusing ring and a reverse contact cup. Background technique [0002] The circuit breaker plays a dual role of protection and control in the power system, and its breaking performance is very important. Vacuum circuit breakers using vacuum as the insulation and arc extinguishing medium have an absolute dominant position in the medium voltage field of the power system due to their excellent performance, and are currently developing in the direction of high voltage and large current. During the breaking process of the vacuum circuit breaker, the contact material evaporates and ionizes to form a vacuum arc plasma. The vacuum arc will produce a significant contraction effect under the strong magnetic pinch force of the self-generated magnetic field, causing serious ablation on the contact surface, and A large amount of metal vapor and partic...

AI Technical Summary

Problems solved by technology

However, the residual longitudinal magnetic field in the center of the contact of the traditional cup-shaped longitudinal magnetic contact system is relatively large, which will prevent the diffusion of residual plasma in the contact gap, reduce the recovery speed of the dielectric strength, and is not conducive to the successful breaking of the current

At the same time, the traditional cup-shaped longitudinal magnetic contact system has low mechanical strength, weak magnetic field strength, and insufficient breaking capacity, so it is not suitable for large-capacity vacuum interrupters

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