Early Failure Statistics Analysis of the Line Contactor of CR400BF EMU

As one of the high-frequency vulnerable parts of the switches, the line contactor in Fuxing CR400BF 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.