... transformers,switching power supply transformer 1.1.6~11kV/3~6.3kV 2.0.63~10MVA 3.S9~S13 transformer Ring Transformer, Power Supply, Electrical EquipmentStandardsGB1094 ... maintenance freeS9-M-630~10000/10 Ring TransformerPrimary voltage: 6, 6.3, 10, 10.5, 11kVTapping range: ±5%Secondary ... voltage: 3, 3.15, 6.3kVConnection group: Yd11Capacity (kVA)No-load loss (W)Load ...