KPD系列低壓軌道平車是(shi)低(di)壓(ya)軌(gui)道供電(dian)(dian)(dian)(dian)，先通(tong)(tong)(tong)過(guo)降壓(ya)變壓(ya)器(qi)將380V動力(li)電(dian)(dian)(dian)(dian)壓(ya)降至(zhi)36V安全(quan)電(dian)(dian)(dian)(dian)壓(ya)，再通(tong)(tong)(tong)過(guo)導電(dian)(dian)(dian)(dian)軌(gui)送至(zhi)平車上(shang)，然后通(tong)(tong)(tong)過(guo)升(sheng)壓(ya)變壓(ya)器(qi)升(sheng)至(zhi)380V交(jiao)流電(dian)(dian)(dian)(dian)供給交(jiao)流電(dian)(dian)(dian)(dian)機驅動平車在軌(gui)道上(shang)行駛（或通(tong)(tong)(tong)過(guo)整流器(qi)將36V交(jiao)流電(dian)(dian)(dian)(dian)轉(zhuan)換成為48V直流電(dian)(dian)(dian)(dian)供給直流電(dian)(dian)(dian)(dian)機驅動平車行駛）；其主要特點是(shi)不(bu)(bu)(bu)用電(dian)(dian)(dian)(dian)纜；降壓(ya)器(qi)以(yi)下是(shi)安全(quan)電(dian)(dian)(dian)(dian)壓(ya)，不(bu)(bu)(bu)僅(jin)安全(quan)，而且不(bu)(bu)(bu)怕燙(tang)、不(bu)(bu)(bu)怕砸、不(bu)(bu)(bu)妨(fang)礙交(jiao)通(tong)(tong)(tong)運輸，容易實現遙控和自動化；可以(yi)在彎道、環道上(shang)行駛，適當增加降壓(ya)器(qi)數量，可以(yi)不(bu)(bu)(bu)受平車運行距離(li)限制，給廠區(qu)運輸帶來很大方便。