Method and device for online monitoring and fault identification of mechanical state of high-voltage circuit breaker

Abstract

The invention discloses a method and device for online monitoring and fault identification of a mechanical state of a high-voltage circuit breaker, and relates to the technical field of electrical equipment testing. The method for online monitoring and fault identification of a mechanical state of a high-voltage circuit breaker uses four different sensors to synchronously monitor various parameters of an operating mechanism of the high-voltage circuit breaker during operation, and performs time-domain and frequency-domain analysis on the information obtained by the sensors in different mannersto form a feature hybrid discriminant matrix, thereby realizing on-line monitoring and fault identification of the state of the high-voltage circuit breaker, solving the problem that it is difficultto accurately determine the failure of the high-voltage circuit breaker during the operator's regular inspection only due to perceptual knowledge and experience, improving the inspection efficiency, and saving resources such as manpower and materials.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment testing, and in particular relates to a method and device for on-line monitoring and fault identification of the mechanical state of a high-voltage circuit breaker. Background technique [0002] With the continuous improvement of the operating voltage level of the power system, the capacity and number of high-voltage circuit breakers as the main protection and control components are also increasing, and it is very important to judge the reliability of their actions. According to the statistics of professional institutions at home and abroad, most of the defects of high-voltage circuit breakers are concentrated in the operating mechanism. [0003] At present, the research on condition monitoring and diagnosis of circuit breakers is still in the development stage. The existing real-time condition monitoring methods are mainly aimed at a certain aspect of electrical or mechanical charact...

AI Technical Summary

Problems solved by technology

Especially for different high-voltage circuit breakers, it is necessary to equip different mounting brackets. Not only must the moving parts and stationary parts cooperate well, but the mechanical characteristic parameters can be accurately measured by keeping the pull rod of the sensor and the movement of the switch moving contact parallel and synchronous. On-site installation and disassembly are very difficult, especially when the circuit breaker is running live

This technology is also not suitable for on-line monitoring of the real-time status of the high-voltage circuit breaker operating process. In addition, the existing high-voltage circuit breaker mechanical characteristic tester can only give whether the mechanical characteristic parameters are within the qualified range, and does not have a circuit breaker Ability to comprehensively evaluate machinery status online

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