Voltage: 6kV, 10kV class; Voltage regulation: off circuit tap regulation; Tapping range: ±5%, ±2X2.5%; Capacity range: 30-2500kVA; Frequency: 50Hz, 60Hz; Phase: single phase and 3-phase; Vector group: Yyn0 or Dyn11 Impedance voltage: in line with national standard or according to customer’s requirements;   Operation environment: max. temperature for outdoor operation environment ≤ 40°C (or according to customer requirements);  Cooling method: oil immersed ONAN;