Electric erosion fault diagnosis method for high voltage circuit breaker contact

Abstract

The invention relates to the field of diagnosis of circuit breakers and in particular discloses an electric erosion fault diagnosis method for a high voltage circuit breaker contact. The method comprises the following steps: acquiring contact ablation evaluation parameters of a circuit breaker, namely a resistance-stroke curve and a static resistance value signal; according to the contact ablationevaluation parameters, acquiring contact ablation state parameter values of the circuit breaker; optimizing parameters of a support vector machine by adopting a bat algorithm, so as to obtain optimalparameters, and building an optimal nonlinear support vector machine by adopting the optimal parameters; forming sampled data; training the optimal nonlinear support vector machine by utilizing the sampled data, inputting the contact ablation evaluation parameters, and outputting corresponding contact ablation state parameter values, so as to obtain the nonlinear support vector machine which canbe evaluated; and predicting contact ablation evaluation parameters of a to-be-evaluated circuit breaker by adopting the trained nonlinear support vector machine. The method disclosed by the inventioncan accurately evaluate an electric erosion fault of the high voltage circuit breaker.

Description

technical field [0001] The invention belongs to the field of diagnosis of high-voltage circuit breakers, in particular to a method for diagnosing electric erosion faults of contacts of high-voltage circuit breakers. Background technique [0002] The contact resistance generated during the movement of the contacts of the electrical switch or the contact resistance generated when working in a vibrating environment is reflected as dynamic contact resistance. Its characteristics are the true reflection and embodiment of the electrical contact state on the surface of the electrical contact, so it can be used as The main basis for the evaluation of electrical contacts. [0003] The contact pair of the high-voltage circuit breaker is mainly composed of the main contact and the arc contact in parallel. The main contact carries the rated working current, and the arc contact bears the arc burn. The state of arcing contacts is the most important factor affecting the electrical life of...

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Problems solved by technology

[0005] For example, the patent document with the application number 201710953217.8 discloses a neural network-based method for evaluating the ablation state of the arc contact of a circuit breaker. It discloses that the neural network algorithm is used to evaluate and judge the ablation state of the arc contact. If the time is too long, the efficiency is not high, and it may fall into a local minimum, resulting in problems such as low accuracy

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