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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 ONAF2Rating, MVAIndicate which cooling method is normally used under full power output
C. Transformer Impedance
MVA BaseHigh-Low Impedance, Percent
D. Nominal Voltage and Configuration
Nominal Voltage Configuration [Δ, Y, Ygrd ]
High SideLow Side
E. No-Load Tap Positions
High Side
High Side Tap # kV12345Indicate the actual operating tap by marking an X next to the tap position
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 Taps Up
Step size 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 ONAN ONAF ONAF2Rating, MVA 150 200 250ONAF cooling, 200 MVA Rating
C. Transformer Impedance
MVA Base 150High-Low Impedance, Percent 8.97
D. Nominal Voltage
High Side, kV 525Low Side, kV 18
E. No-Load Tap Positions
High Side
High Side Tap # kV1 551,2502 – X 538,1253 525,0004 511,8755 498,750Indicate the actual operating tap = 2
Low Side
Low Side Tap # kVX 18Indicate the actual operating tap
F. For Load Tap Changers
Tap Changer winding
(H, X, or Y)
Tap Range [kV or Percent]
Taps Down Taps Up
Step size 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