KPD series electric flat car is low voltage track type electric flat car, its working principle is through the step–down system ground control, from the 380 V power supply (or single–phase three–phase voltage drop to 36 V safety voltage, Feed to the conductor rail (orbit) of conductor rail and a flat car, the low voltage electric flat car conductive device to step–up transformer on the car, step up to 380 V three–phase or single–phase capacitor motor to drag, flat car running. The advantages of KPD series electric flat car is: because there is no cable, is not only safe, and is not afraid of hot, not afraid to hit, hot dirty cross transportation, easy to implement remote control and automation, can run on the bend, stop on, position, so appropriate to increase the number of step–down transformer device is not restricted by flat car running distance, to the factory layout with very convenient transport.