针对SS3型机车辅机过载保护电路电源受劈相机琴键开关控制的不足,提出电路改进方案,机车运用实践证明该改进方案可操作性强,效果显著。 Aiming at the deficiency of the power supply of SS3 locomotive auxiliary overload protection circuit controlled by the key switch of the split-phase camera, the circuit improvement scheme is put forward. The practice of the locomotive proves that the improved scheme is feasible and has obvious effect.