Circuit breaker failure diagnosis method based on circuit breaker dynamic property test instrument

Abstract

The invention relates to a circuit breaker failure diagnosis method based on a circuit breaker dynamic property test instrument, which comprises the following steps: collecting arbitrary sample signals from the test instrument; converting the collected signals to digital signals through digital-analog conversion; shaping and filtering the digital signals to form finishing signals W(t); extracting the wavelet characteristic entropy of the finishing signals W(t), and inputting the wavelet characteristic entropy into a relevance vector machine model to obtain the posterior probability of a corresponding relevance vector RVM; and by adopting the strategy of maximum probability win (MPW), attributing failure to the sort of signals having maximum posterior probability. The invention has the following advantages: wavelet decomposition is carried out on the collected signals to extract the wavelet characteristic entropy as a characteristic value, and the characteristic value is input to a failure diagnosis model established according to a relevance vector machine principle for diagnosis; by adopting the posterior probability diagnosis method, power equipment can be monitored in time; and the calculation amount of the kernel function is greatly reduced, and the diagnosis efficiency and accuracy are improved.

Description

[0001] technical field [0002] The invention relates to monitoring equipment for power lines, in particular to a circuit breaker fault diagnosis method based on a circuit breaker dynamic characteristic tester. Background technique [0003] In order to meet the needs of intelligent power development, the current regular maintenance of power equipment should be gradually transformed into condition-based maintenance to reduce hidden dangers caused by improper maintenance operations. For circuit breakers, in order to achieve the purpose of state-of-the-art maintenance, it is necessary to monitor them online and as far as possible to intelligently diagnose their mechanical characteristic faults by analyzing the detected data. [0004] At present, the circuit breaker tester is in the stage of factory inspection and shutdown maintenance of the circuit breaker. The measurement content is relatively small, and all of them are intrusive measurements. They do not have the function...

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Problems solved by technology

[0004] At present, the circuit breaker tester is in the stage of factory inspection and shutdown maintenance of the circuit breaker. The measurement content is relatively small, and all of them are intrusive measurements. They do not have the function of online monitoring, and cannot meet the intelligent diagnosis of circuit breaker dynamic characteristic failure capacity, unable to meet the needs of intelligent power development

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