通过对牵引电动机闪络故障类型的统计和分析，基本查清了造成故障的主要原因，即因为整流方面的异常磨损，而导致整流不良，继而引发飞弧而形成碳黑，最终随碳黑层的不断扩大而造成接地故障。为防止和减少该类故障，本文针对上述情况提出了一系列故障前管理措施，并付之以新开发碳刷的应用，取得了一定预防效果。 Through the statistics and analysis of the types of flashover faults of traction motors, the main causes of the faults are basically identified. That is, the rectifier is bad due to the abnormal wear and tear of the rectification, and then the flashover is caused to form the carbon black. Finally, The continuous expansion caused by ground fault. In order to prevent and reduce such failures, this paper puts forward a series of pre-failure management measures according to the above situations and paves the way for the newly developed application of carbon brushes and achieves some preventive effects.