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在SS3型机车的运行中，因司机错打反向器直接进级，造成牵引电机全部烧损的事故时有发生。文章举出两例事故实例，对SS3型机车控制电路进行分析，介绍所加装保护装置的特点、控制原理，以及对控制电路的改进等。
In the operation of the SS3 locomotive, the driver mistakenly hit the inverter directly upgrade, resulting in traction motor all the accidents have occurred from time to time. The article gives two examples of accidents, analyzes the control circuit of SS3 locomotive, introduces the characteristics of the installed protection device, the control principle and the improvement of the control circuit.