High-voltage circuit breaker cam crack fault detection device and method

Abstract

The invention discloses a high-voltage circuit breaker cam crack fault detection device and method, and belongs to the field of power system fault detection. The detection device comprises a magneticbase, a vibration acceleration sensor, a signal acquisition module and a signal processing module. According to the invention, a vibration signal near the cam in the closing process of a circuit breaker is collected, a wavelet packet frequency band energy decomposition algorithm is used for extracting a characteristic value of the effective vibration signal, and the characteristic value is compared with a preset threshold value, so that whether the cam structure of the high-voltage circuit breaker operating mechanism has a crack defect or not is judged. Compared with the prior art, the methodprovided by the invention is high in accuracy, high in operation speed, capable of realizing online monitoring of the cam crack fault, free of influence on the system structure of the high-voltage circuit breaker, free of motion interference risk, safe and reliable.

Description

technical field [0001] The invention belongs to the field of power system fault detection, and in particular relates to a high-voltage circuit breaker cam crack fault detection device and method. Background technique [0002] High-voltage circuit breakers are an important part of the power system and have the functions of control and protection. When a fault occurs in the power system, it is required that the high-voltage circuit breaker can cut off the fault current quickly and accurately, so as to prevent the further expansion of the accident, so as to ensure the safe operation of the system. Therefore, the reliability requirements for the operation of high-voltage circuit breakers are getting higher and higher, and relevant statistics show that mechanical failure is the main failure form of high-voltage circuit breakers. [0003] The cam structure has an important influence on the operating characteristics and service life of the spring operating mechanism. During the cl...

AI Technical Summary

Problems solved by technology

The crack failure of the cam will, on the one hand, cause severe vibration and shock during the operation of the operating mechanism, which will cause damage to other parts; on the other hand, it will cause rapid wear of the cam, which will further affect the opening and closing characteristics of the circuit breaker. influences

[0004]Because the cam is located inside the high voltage circuit breaker operating mechanism, it is difficult to detect when the cam cracks, and it is difficult to test and diagnose with ordinary methods

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