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电寿命是交流接触器的重要性能指标之一,受各种因素的影响,其中电弧电流对触头的侵蚀是最主要因素.该文首先提出将电弧电流作为交流接触器触头系统侵蚀的参量,建立了基于起弧相角的触头磨损数学模型;然后基于损伤累积效应建立了交流接触器电寿命分布特征的数学模型,分析了负荷连接方式对其电寿命分布的影响:最后基于MonteCarlo方法建立了交流接触器电寿命模拟试验模型,并对交流接触器在不同工作状态下的电寿命进行了仿真,得到电寿命分布特征,并与可靠性研究领域公认的耗损型产品的寿命服从威布尔分布结论一致.仿真结果表明,文中提出的交流接触器电寿命分布特征的数学模型可以很好地解释实际使用中电寿命呈现出的分散性,对其可靠性的提高具有重要意义.“,”Electrical endurance is an important performance indicator of AC contactor,and it is influenced by various factors,among which the most important one is arc erosion caused by the arc current between contacts when breaking the load.Firstly,arc current was taken as a decisive factor of contact erosion,and the mathematical model of contact erosion was built based on arc current phase angle.Secondly,according to the damage accumulation effect,the mathematical model of electrical endurance for AC contactor was established,and the relationship between electrical endurance distribution and loads under different connection modes was analyzed.Finally,the simulation model of electrical endurance for AC contactor was established using Monte-Carlo method,and the distribution characteristics of electrical endurance under different working conditions were obtained.The simulation results obey Weibull distribution,which is consistent with the generally accepted conclusion about wearout failure products in reliability field.The mathematical model proposed in this paper can well explain the dispersion of electrical endurance for AC contactor,and it can provide valuable reference for the reliability improvement of AC contactor.