Method for electrically detecting vacuum degree of vacuum circuit breaker through breakdown of auxiliary electrode

Abstract

The invention provides a method for electrically detecting a vacuum degree of a vacuum circuit breaker through breakdown of an auxiliary electrode. The vacuum circuit breaker comprises an upper wire unwinding rod, a torsion protecting ring, a corrugated pipe, a shielding case, a movable contact, a fixed contact, a lower wire unwinding rod and an insulation outer shell. The method comprises the following steps: (a), the auxiliary electrode used for detecting the vacuum degree is arranged between the shielding case and the insulation outer shell, the auxiliary electrode is arranged on the inner side of the insulation outer shell, and a certain clearance distance is arranged between one end of the auxiliary electrode and the shielding case; (b), the auxiliary electrode and the shielding case are led out of the vacuum circuit breaker; (c), the auxiliary electrode and the shielding case are connected into a detection loop after being led out, the breakdown condition between the auxiliary electrode and the shielding case is tested by applying impact voltages, if the breakdown succeeds, the vacuum degree of the vacuum circuit breaker does not meet requirements, and if the breakdown does not succeed, the vacuum degree of the vacuum circuit breaker meets the requirements.

Description

technical field [0001] The invention relates to the field of vacuum circuit breaker detection. Specifically, the present invention relates to a method for live detection of the vacuum degree of a vacuum circuit breaker by using auxiliary electrode breakdown and a system for applying the method. Background technique [0002] Vacuum circuit breaker is a kind of high-voltage switch developed in recent years, which is widely used in electric power, chemical industry, metallurgy, mining and other industries. The arc extinguishing medium of the vacuum circuit breaker and the insulating medium of the contact gap after arc extinguishing are both high vacuum. Due to its small size, light weight, low environmental pollution, large breaking capacity, good arc extinguishing performance, it is suitable for frequent operation and easy to operate and maintain. , high reliability, long mechanical and electrical life and other advantages have been widely used in power systems. Especially i...

AI Technical Summary

Problems solved by technology

Because for the current vacuum circuit breaker, when the vacuum degree drops, it will not affect the normal operation of the power system, but when the fault current is to be broken, the reduced vacuum degree will make it difficult to extinguish the arc

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