CR400BF动车组线路接触器早期故障统计分析

Early Failure Statistics Analysis of the Line Contactor of CR400BF EMU

复兴号CR400BF动车组线路接触器连接四象限变流器,属于开关类高频易损部件之一。基于复兴号CR400BF动车组实际运行故障数据,从车型、车组和车次等角度统计线路接触器故障特征,库检中发现走行里程在15万km内的线路接触器故障频数占线路接触器总故障频数的95.5%;根据指数分布、威布尔分布和正态分布特点,对故障里程数进行参数辨识,采用柯尔莫哥洛夫-斯米尔诺夫(Kolmogorov-Smirnov,K-S)检验,发现威布尔分布的K-S检验统计量最小,显著性水平最高,将其用于描述线路接触器的故障频数分布函数更合理;直方图法分析结果表明,走行里程在36万km内的线路接触器故障频数占线路接触器总故障频数的55.7%,在此阶段应加强线路接触器的检修力度。

As one of the high-frequency vulnerable parts of the switches, the line contactor in Fuxing CR400 BF EMUs connects the four-quadrant converters. The fault characteristics of the line contactor were calculated from the perspectives of model, vehicle group, and number of vehicles based on the actual operating fault data. The results showed that within 150 000 kilometers of travel distance, the number of faults found in warehouse inspection accounted for 95.5% of the total frequency of line contactor failures;According to the characteristics of Exponential distribution, Weibull distribution and Normal distribution, the fault mileage parameters were identified and then the K-S test was adopted. The result showed that the K-S test statistic of Weibull distribution was the smallest and the significance level was the highest, which used to describe the fault frequency distribution function of the line contactor can be more reasonable. The analysis result of the histogram method showed that the fault frequency of the line contactor within a mileage of 360 000 kilometers accounted for 55.7% of the total fault frequency of the line contactor, at the stage of which, the maintenance of the line contactors should be strengthened.