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牵引电动机励磁回路开路极易使磁场削弱电阻过流而引起机车电器火灾，严重威胁着列车的运行安全。分析造成励磁回路开路的原因，进而提出改进建议。
Traction motor excitation circuit open circuit can easily weaken the magnetic field resistance overcurrent caused by electric locomotive fire, a serious threat to the safe operation of the train. Analysis of the cause of excitation circuit open, and then put forward suggestions for improvement.