Kev ua haujlwm ntawm txoj kab sib txuas tau yog xa hluav taws xob, thiab hu rau cov fais fab, qhov chaw nres tsheb (chaw nres tsheb) khiav mus ua haujlwm, ua kom muaj zog hauv kev sib txuas lus, thiab kom tau txais kev hloov xa hluav taws xob. High-voltage kis kab yog lub ntsiab artery ntawm lub zog kev lag luam thiab ib feem tseem ceeb ntawm lub zog system. Kev ntsuas ntawm cov kab sib chaws nyob hauv Suav yog: 35kV, 66kV, 110kV, (154kV), 220kV, 330kV, 500kV, 750kV, ± 800kV, 1000kV; cov hluav taws xob ua hluav taws xob uas tsim los ntawm cov hluav taws xob cog raug xa mus rau lub zog hluav taws xob los ntawm tus qauv tsim tawm ntawm cov theem siab, thiab qhov hluav taws xob txo qis. Cov kab hluav taws xob ntawm lub tshuab hluav taws xob thiab cov high-voltage fais fab kab ntawm 35 kV thiab siab tshaj nyob rau hauv lub tshuab fais fab yog hu ua fais fab kis kab.