... ,AC Resonance Withstand Voltage Test system,high voltage test systemTransformer, GIS, SF6 switch, CT/PT, insulator, bus bar, cable, bushing, and ... 220kV transformer ≤80000kVA 110kVtransformer≤ 50000kVA 500kVGIS,PT,CT, etc. 220kVswitch,GIS,PT,CT, etc. 110kV(400mm2) cable≤1.5km 220kV (400mm2 ...