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前言 东风4 型机车为了扩大恒功率运行的速度范围，采用了两极磁场削弱，在牵引电动机励磁绕组两端并以磁削电阻，电阻的接入是靠组合接触器1ＸＣ和 2ＸＣ来完成的。两组合接触器在一定速度值的闭合和开断是通过过渡装置实现的。近来，在我段的中、小辅修和中检、碎修活票中
Dongfeng 4 locomotive in order to expand the speed range of constant power operation, the use of the bipolar magnetic field weakening, both ends of the traction motor excitation windings and magnetic cutting resistance, resistance access by combination contactor 1XC and 2XC to complete. The closing and breaking of the two combined contactors at a certain speed value are realized by the transition device. Recently, in my paragraph, minor minor and minor examinations, broken repair live vote