Residual electrical life prediction of AC contactor based on Bayesian inference
In this article,the reliability of the AC contactors is studied.Firstly,the arc erosion mechanism of AC contactor is analyzed,and an arc erosion model is formulated,which takes into account the effect of arc voltage and arc reignition.According to the model,the variation process of the characteristic parameters of AC contactors performance degradation is consistent with the actual degradation law of the AC contactor.The characteristics of performance degradation data under different working conditions are analyzed,and the equivalent conversion method of prior information under different working conditions is proposed to solve the problem of prior information utilization under different working conditions.A residual electrial life prediction model of the AC contactor based on Bayesian inference is established to improve the prediction accuracy of the residual electrical life,and the residual electrical life prediction of AC contactor is realized by using the performance degradation data under different working conditions.The electrical life simulation and experimental analysis of AC contactors are implemented under two working conditions,AC-4 and AC-3.The relative error is less than 5.5%,which verifies the accuracy of the proposed method.
AC contactorarc voltagearc reignitionBayesian inferenceresidual electrical life
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