Reliability Evaluation Method of Electromagnetic Contactor Used in High-Speed Train
Liu Jianqiang1, Chen Aifeng1, Yan Yifan2, Zhang Ming1, Qi Hongfeng2
1. School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China; 2. Technical Research Department CRRC Industry Research Institute Co. Ltd Beijing 100070 China
Abstract:The state of electromagnetic contactor is very important for the safe and normal operation of the high-speed train. At present, there is a lack of testing and evaluation methods for the state of electromagnetic contactor in high-speed train. The state of electromagnetic contactor is uncertain and uncontrollable, which raises potential security problems in high-speed train operation. To solve this problem, the failure mechanism of the high-speed train electromagnetic contactor is analyzed. According to the analysis of contactor failure mechanism, the reliability evaluation method of contactor is proposed. The method establishes the contact gap degradation model of the contactor. Through the finite element analysis of the contactor and the dynamic simulation model, the degradation model of the overtravel time is deduced, and then the prediction model of the remaining life of the contactor is obtained. In order to verify the effectiveness of the reliability evaluation method, a contactor reliability test platform was designed and built. The reliability life test was carried out based on Siemens 3RT1017-2KF41 electromagnetic contactor. The remaining life of the contactor is predicted with the prediction model of the residual life. The results shows that the proposed method is effective to predict the residual life of the relay, which provides important reference for the condition monitoring and maintenance of the electromagnetic relay in high-speed train.
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