A high voltage vacuum circuit breaker pole

Abstract

The invention provides a high-voltage vacuum circuit breaker pole. The high-voltage vacuum circuit breaker pole includes an upper wire outgoing seat, a vacuum arc-extinguishing chamber, a moving conducting rod, a lower wire outgoing seat and a canted coil spring; a fixed end and a moving end are arranged in the vacuum arc-extinguishing chamber; the fixed end is located above the moving end; the fixed end is connected with the upper wire outgoing seat; the moving conducting rod is arranged between the vacuum arc-extinguishing chamber and the lower wire outgoing seat; the upper part of the moving conducting rod is connected with the lower part of the moving end; the lower part of the moving conducting rod is plugged into the lower wire outgoing seat; the canted coil spring is arranged in the lower wire outgoing seat and surrounds the moving conducting rod; and the lower part of the upper wire outgoing seat, the upper part of the lower wire outgoing seat and the vacuum arc-extinguishing chamber are embedded into an epoxy resin frame and are sealed by epoxy resin. According to the high-voltage vacuum circuit breaker pole of the invention, heat generated by the vacuum arc-extinguishing chamber can be rapidly transferred to the upper wire outgoing seat, the lower wire outgoing seat and an external heat radiating structure, and therefore, effective evacuation of the heat can be realized, and damage caused by temperature rise to a vacuum circuit breaker can be avoided.

Description

technical field [0001] The invention belongs to the technical field of vacuum circuit breakers, and in particular relates to a pole of a high-voltage vacuum circuit breaker. Background technique [0002] The rapid development of vacuum technology has made vacuum circuit breakers more and more widely used. Vacuum circuit breakers are mainly composed of a conductive main circuit and an operating mechanism. At present, the conductive main circuit has developed from an open structure to a solid-sealed pole structure. The solid-sealed pole is to cast the vacuum interrupter in the epoxy resin solid insulating material to form a solid-sealed pole. The insulation performance of the solid-sealed pole minimizes the impact of the external environment on the vacuum interrupter and greatly improves The dielectric strength of the vacuum circuit breaker is improved, but due to the work, the upper outlet seat, the vacuum interrupter and the lower outlet seat all generate heat, which serious...

AI Technical Summary

Problems solved by technology

The research shows that the temperature rise of the vacuum circuit breaker decreases rapidly with the increase of the radius of the contact point of the moving and static contacts and has nothing to do with the position of the contact point. The temperature rise of the device decreases with the increase of the radius of the conductive rod, and the trend of temperature drop at the contact point is the most significant, but when the radius of the conductive rod increases to 25 mm, the temperature rise does not decrease significantly.

Therefore, the measures of increasing the size and reducing the temperature rise can only achieve quite limited effects.

Especially for high-voltage and high-current vacuum circuit breakers with a voltage level of 72.5kV, the vacuum interrupter will generate a lot of heat during operation, which will damage the insulation structure, reduce the service life of the circuit breaker, and even cause a short circuit

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