A 250 kVA transformer with a primary voltage of 20 kV and a secondary voltage of 0.4 kV is commonly used in electrical distribution systems to step down medium voltage to low voltage for various applications. These transformers are typically three-phase and can be designed as oil-immersed or dry-type units.

– Key Specifications:

– Rated Power: 250 kVA

– Primary Voltage: 20 kV

– Secondary Voltage: 0.4 kV

– Frequency: 50 Hz or 60 Hz

– Cooling Method: Oil-immersed (ONAN) or Dry-type (AN)

– Winding Material: Copper or Aluminum

– Vector Group: Dyn11 or Yyn0

– Impedance Voltage: Approximately 6%

– Tap Changer Range: ±2 x 2.5%