一种电磁继电器寿命评估的新方法

A New Life Evaluation Method of Electromagnetic Relay

温度、湿度和有机污染物是影响电磁继电器失效的主要老化因素,在对其老化机理分析的基础上,设计了继电器的工作加速寿命试验。利用平均秩次法和最小二乘法对试验数据进行分析处理,获得威布尔分布模型的两个参数,得到继电器在不同温度下的可靠度函数。利用90%的可靠度寿命τ(0.9)作为继电器的使用寿命,建立寿命与温度的关系,从而计算出触点材料的活化能Ea,进而得到继电器的Arrhenius寿命评估模型。利用模型计算出继电器在现场实际使用温度或给定温度下的使用寿命,为现场制定继电器的预防性维修策略提供支持。试验结果表明,所提方法具有一定的有效性。

Temperature,humidity and organic pollutants are the main aging factors which cause the electromagnetic relays failure in power plants.This paper designed an accelerated aging test based on the analyzing detailed the aging mechanism.Two parameters of Weibull distribution model were obtained by analyzing and processing the experimental data using mean rank order and least squares,in order to obtain the reliability function of the relay at different temperatures.Using 90%reliability lifeτ(0.9)as the service life of the relay,and then the relationship between the life and temperature was obtained.Thus,the activation energy E a of contact material was calculated,and Arrhenius life assessment model of the relay also was known.This model can be used to calculate the life at the actual temperature on site or given temperature,which provides support for preventive maintenance strategy on site.The test results show that this method has some validity.