KPC系列电动平车的供电方式是安全滑触线供电，其工作原理是在轨道侧面开设地沟，地沟内安装安全滑触线，地沟上铺有单面用铰链固定于地面上的盖板。
电动平板车运行时通过安装在平车上的地沟翻板装置，将盖板掀起，翻板装置内有同安全滑触线继电器连接的电缆。轨道平板车通过后盖板自动放回地面，能保证无轨车辆顺利通过，地沟翻板滑触线型电动轨道平车，不受运行距离的限制，不会影响电动平车的运行速度，滑动灵活，安全可靠，故障率较低，适合大吨位、长距离运输方案的选用。
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