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东风４型机车在运用中主回路接地故障是经常发生的，而接地故障大部分出现在４１０牵引电机上，因为４１０牵引电机工作条件恶劣，在运用中由于机车震动，通过道岔等因素，电机主副极线圈及联线绝缘容易破损，在雨雪季节电机绝缘低，在风砂区段容易受到砂尘侵袭，一旦发生接地
In the use of DF4 locomotive main circuit ground fault occurs frequently, and most of the ground fault appears in the traction motor 410, 410 traction motor poor working conditions, in use due to locomotive vibration, turnouts and other factors, the main motor Sub-pole coil and on-line insulation is easily damaged, low insulation in the rain and snow season, sand and sand in the sand section susceptible to sand and dust invasion, in the event of grounding