HV: siab voltage, Feem ntau, nws yog siab tshaj 110kV, xws li 110kV, 220kV, 500kV, 750kV, thiab lwm yam
MV: nruab nrab voltage, Feem ntau hais txog qhov voltage ntawm 3kV thiab 100kV, xws li 3kV, 6kV, 10kV, 20kV, thiab lwm yam
LV: tsis tshua muaj hluav taws xob, Nws feem ntau hais txog qis dua 3kV, thiab rau kev faib tawm, feem ntau yog hais txog 400V, uas feem ntau hu ua 380V
Lub luag haujlwm ntawm cov substations no yog hloov AC voltage mus rau qhov tsim nyog voltage. HV yog rau kev sib kis mus ntev, MV yog rau kev faib khoom ze, thiab LV yog rau cov khoom siv hluav taws xob rau cov neeg siv. MV / MV yog AC voltage hloov dua siab tshiab nrog qhov sib npaug lossis zoo tib yam voltage theem, uas tuaj yeem ua hluav taws xob cais lossis hloov pauv mus rau ntau qhov tso tawm.