Long skelim level bilong voltej, ol i ken brukim i go long namel na liklik voltej pawa kebol (35 kV na daunbilo), hai voltej kebol (antap long 110 kV), ekstra hai voltej kebol (275-800 kV), na ultra-hai voltej kebol (1000 kV na antap). Na tu, ol i ken brukim ol i go long AC na DC kebol bihainim karent.
I kam long Insulesen Materiel
1. Ol pawa kebol we i gat oil long en: Ol pawa kebol we i gat oil long en i gat longpela taim tru bilong yusim. Ol i seif, yu ken trastim, i gat longpela sevis laip, na i no gat bikpela pe. Bikpela hevi bilong ol em i mak bilong hait bilong instolesen. Divelopmen bilong 'drip-free impregneted pepa insulesen i stretim dispela mak bilong hait, na larim ol oil-impregneted pepa insulesen kebol i ken go het long yusim long planti hap.
2. Ol plastik pawa kebol we i gat insulesen: Ol pawa kebol we i gat wanpela plastik insulesen leit. Ol plastik we ol i save yusim planti taim em olsem 'polyvinyl chloride', 'polyethylene', na 'cross-linked polyethylene'. Ol plastik kebol i gat wanpela simpol straksa, em i isi long wokim na prosesim, em i no hevi tumas, na em i isi long putim na putim na i no gat mak bilong hait bilong putim. Olsem na, ol i save yusim planti long ol 'medium' na 'low voltage' kebol na ol i wok long senisim ol pepa kebol we i gat 'viscous oil' long en. Bikpela hevi bilong en em i 'dendrite breakdown phenomenon', we i pasim yusim bilong en long ol bikpela 'voltage'.
3. Raba-insulet pawa kebol: Ol i wokim insulesen leia long raba wantaim ol kain kain marasin, we ol i miksim gut, na rausim i go insait long 'conductive core', na bihain ol i mekim i kamap 'vulcanized'. Em i malumalum na i save tanim tanim, na dispela i mekim em i gutpela long ol instolesen we i save muv planti taim na i gat liklik 'bend radii'.
Ol 'common rubber compounds' we ol i save yusim long 'insulation' em ol 'natural rubber-styrene-butadiene rubber blends, ethylene propylene rubber, na butyl rubber.
Klasifikesen long Voltej Level:
1. Low-voltage kebol: Em i gutpela long putim long AC 50Hz transmisin na distribusen lain wantaim reit voltej bilong 3kV na daunbilo, bilong salim pawa.
2. Ol 'medium-' na 'low-voltage kebol: (planti taim 35kV na aninit): PVC insulated kebol, polyethylene insulated kebol, kros-linked polyethylene insulated kebol, na ol narapela.
3. Ol hai-voltej kebol: (planti taim 110kV na antap): PE kebol na kros-linked polyethylene insulated kebol, na ol narapela.
4. Ultra-high-voltage kebol: (275-800kV). 5. Ultra-high voltej kebol: (1000kV na antap).
