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(一)故障经过1978年7月25日东风1708内燃机车牵引1803次行驶至尖方站突然发现第一组牵引电动机电流达600～700安,而第二、三组牵引电动机电流降到200安左右,而且功率下降。切掉第一组电动机后,二、三组电动机电流上升,比三组电动机同开时的高,此时功率降至原来的2/3。回段后走车试验时,关掉第二、三组电动机,单开第一组,手柄提至三位不走车,到四位机车才稍动,且电动机电流较大。
(A) failure After July 25, 1978 Dongfeng 1708 diesel locomotive traction 1803 times to the sharp side station suddenly found that the first set of traction motor current of 600 to 700 amps, while the second and third sets of traction motor current down to 200 amps Left and right, and power down. After cutting off the first group of motors, the current of the second and third groups of motors increases, which is higher than that of the three groups of motors, and the power is reduced to 2/3 of the original. Back to the car after the test, turn off the second and third groups of motors, a single open the first group, the handle raised to three do not take the car to the four locomotive before moving slightly, and the motor current larger.