Abstract: Aiming at the problem that the accuracy of the characteristic parameters affecting the AC contactor performance degradation state is not high,this paper proposed an adaptive optimal weight based AC contactor characteristic parameter weight calculation method.Firstly,the contactor degradation state test platform was built,and the test was carried out according to the national standard AC-4 to obtain the characteristic parameter test data.Secondly,according to the principle of moving contact impact speed,arcing phase angle,closing phase angle and bounce time,the corresponding characteristic parameters were extracted.Finally,an improved adaptive weighting method was used to calculate the weight of the feature parameters,define the optimal solution,calculate the weight value close to the optimal solution,and estimate the weight of the characteristic parameters of the AC contactor.The experimental results show that the improved adaptive weights proposed in this paper can better calculate the weights of the characteristic parameters,truly reflect the working state of the AC contactor,and improve the accuracy of the AC contactor performance degradation model.

Key words: AC contactor, characteristic parameter extraction, performance degradation test, data fitting analysis, adaptive optimal weight