A Method for Predicting the Mechanical Life of a High Voltage Circuit Breaker

Abstract

The invention discloses a high-voltage circuit breaker mechanical life prediction method. The method comprises the following steps that: the failure rate of the accidental failure period of a high-voltage circuit breaker is described through an exponential distribution model, and a least square method is adopted to fit a polynomial model to replace the exponential distribution model; the historical data of the number of the times of switching off, switching off time, the number of the times of switching on and switching on time of the high-voltage circuit breaker are put into statistics, so that m groups of data (xi, yi) are obtained; the total variance of the m groups of data is obtained according to the polynomial model, a Vandermonde matrix is obtained according to the arrangement of points with the minimum variance, and the Vandermonde matrix is solved; solved data are substituted into the polynomial model, and a fitted curve of switching off / switching on time is solved; and the switching off time degradation curve and switching on time degradation curve of the high-voltage circuit breaker are drawn, and the operating mechanical service life of the high-voltage circuit breakercan be obtained according to the number of the times of the switching off of the high-voltage circuit breaker and the number of the times of the switching on of the high-voltage circuit breaker. Withthe high-voltage circuit breaker mechanical life prediction method adopted, the mechanical life of the high-voltage circuit breaker can be accurately predicted.

Description

technical field [0001] The invention relates to the technical field of high-voltage circuit breakers, and more specifically, to a method for predicting the mechanical life of a high-voltage circuit breaker. Background technique [0002] According to statistics, the mechanical faults of porcelain column high-voltage circuit breakers account for 76% of the total defects, and the mechanical faults of gas-insulated high-voltage circuit breakers account for 47% of the total faults, including mechanisms and their secondary components, switch bodies Mechanical transmission failure. Therefore, the evaluation of the mechanical life of high voltage circuit breakers is very important. [0003] At present, for the prediction and evaluation of the mechanical life of the high-voltage circuit breaker in operation, the static mechanical life information of the switchgear described in the static mechanical life is generally used, that is, the number of times the high-voltage circuit breaker...

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Problems solved by technology

[0005] In order to solve the problem that the mechanical life prediction and evaluation of high-voltage circuit breakers in operation generally adopt static mechanical life, the present invention cannot accurately predict the mechanical life of high-voltage circuit breakers, and provides a method for predicting the mechanical life of high-voltage circuit breakers, which can accurately predict Mechanical life of high voltage circuit breakers

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