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