(1) Class I substation. Hais txog AC UHV chaw nres tsheb, hluav taws xob nuclear, lub zog loj hauv paus (3 lab kW thiab siab dua) kev xa tawm thiab hla- cheeb tsam (North China, Central China, East China, Northeast China, Northwest China) 750/500/330kV substations.
(2) Class II substation. Hais txog lwm qhov chaw substations uas tsis yog Class I, 750/500/330kV substations, fais fab nroj tsuag kis tau tus mob substations (1 lab kW thiab saum toj no, tsawg dua 3 lab kW) thiab hla- xeev 220kV substations, substations qhov twg lub ntsiab transformer los yog busbar outage, hloov tsis kam mus ua hauj lwm theem 4.
(3) Class III substation. Hais txog 220kV substations uas tsis yog Class II, fais fab nroj tsuag kis tau tus mob substations (300,000 kW thiab saum toj no, tsawg tshaj li 1 lab kW), substations qhov twg lub ntsiab transformer los yog busbar outage, hloov tsis kam ua hauj lwm ua rau ib theem 5 daim phiaj xwm txheej, thiab substations uas ncaj qha muab hwj chim rau cov neeg siv tseem ceeb ntawm qib 1 los yog siab dua. (4) Class IV substations. Cov no yog cov chaw nres tsheb ntawm 35kV thiab siab dua, tsis suav nrog Chav Kawm I, II, thiab III.
Nco tseg:Tag nrho 220kV substations hauv cheeb tsam ua haujlwm yog Class III substations, thiab tag nrho cov substations ntawm 110kV thiab hauv qab no yog Class IV substations.