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GSU Transformer Data Template
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
ONAF2
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
[, 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
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
ONAF2
Rating, MVA
150
200
250
ONAF cooling, 200 MVA Rating
C. Transformer Impedance
MVA Base
150
High-Low Impedance, Percent
8.97
D. Nominal Voltage
High Side, kV
525
Low Side, kV
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
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
