56 MVA 50/20 kV power transformer

Procurement and delivery of one three-phase, oil-immersed, air-cooled power transformer with load tap changer with the following specifications: Rated power: 56 MVA Nominal system voltages: 50/20 kV Rated voltage, primary winding: 50 kV Rated voltage, secondary winding: 20 kV Voltage regulation, primary/secondary: 50 ± 8×1,25% / 20 kV Short Circuit Impedance, primary/secondary: 12% Vector group: Dyn 5 Frequency: 50 Hz Cooling: ONAN Maximum sound power level: 78 dB(A) at full load, including winding noise.