constant voltage transformer High voltage transformer 10kV-35kV 0.63~10MVA S9~S13 transformer Constant Voltage TransformerService conditions 1) ... Distribution TransformerPrimary voltage: 6, 6.3, 10, 10.5, 11,35kV,Tapping range: ±5%Secondary voltage: 3, 3.15, 6.3kVConnection group ...