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Transformer Location High Side Bus Name and Number: ____________________ Low Side Bus Name and Number: ____________________ Two-winding Transformers Provide the following information from the transformer nameplate data and a picture of the nameplate. A. Transformer Type Indicate whether the transformer is a 3-phase unit or three 1-phase units. Transformer Type (Phases) B. Transformer MVA Ratings Cooling ONAN ONAF Rating, MVA Indicate which cooling method is normally used under full power output C. Transformer Impedance MVA Base High-Low Impedance, Percent D. Nominal Voltage and Configuration Nominal Voltage Configuration [Δ, Y, Ygrd ] High Side Low Side E. No-Load Tap Positions High Side High Side Tap # kV 1 2 3 4 5 Indicate the actual operating tap by marking an X next to the tap position ONAF2 Low Side Low Side Tap # kV Indicate the actual operating tap number (if applicable) F. For Load Tap Changers Tap Changer winding (H, X, or Y) Tap Range [kV or Percent] Taps Down Step size Taps Up No. of Steps Step size No. of Steps Regulated voltage: ____________ percent, or Volts Controlled bus: ____________ Dead-band: ____________ percent, or Volts Tap changer time constant: _____________ sec Example for Two-winding Transformers Provide the following information from the transformer nameplate data A. Transformer Type Indicate whether the transformer is a 3-phase unit or three 1-phase units. Transformer Type (Phases) 3 B. Transformer MVA Ratings Cooling Rating, MVA ONAF cooling, 200 MVA Rating ONAN 150 ONAF 200 C. Transformer Impedance MVA Base High-Low Impedance, Percent D. Nominal Voltage 150 8.97 ONAF2 250 High Side, kV Low Side, kV 525 18 E. No-Load Tap Positions High Side High Side Tap # kV 1 551,250 2–X 538,125 3 525,000 4 511,875 5 498,750 Indicate the actual operating tap = 2 Low Side Low Side Tap # kV X 18 Indicate the actual operating tap F. For Load Tap Changers Tap Changer winding (H, X, or Y) Tap Range [kV or Percent] Taps Down Step size No. of Steps Regulated voltage: ____________ percent, or Volts Controlled bus: ____________ Dead-band: ____________ percent, or Volts Tap changer time constant: _____________ sec Taps Up Step size No. of Steps