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叙述了贵阳机务段ＳＳ１机车在运用中接地继电器恢复线圈和平波电抗器发生的烧损故障，以及低压试验时发生的窜车事故．分析了故障原因，提出了对控制电路进行改造的方案。
Describes the burning fault of the grounding coil relay and the smoothing reactor in the locomotive section of Guiyang locomotive depot, and the strangulation accident happened during the low pressure test. Analyzed the cause of the malfunction, put forward the plan that the control circuit is reformed.