Transformer Nameplate Data
Calculated Values
Resistance (R)
- p.u.
Reactance (X)
- p.u.
X/R Ratio
-
Additional Values
Impedance (Z) - p.u.
Base Impedance - Ω
R (ohms, HV side) - Ω
X (ohms, HV side) - Ω
Calculation Method
Per-Unit Resistance:
R = PCu / Srated
Where PCu is copper losses in MW and Srated is MVA rating
Per-Unit Reactance:
X = √(Z² - R²)
Base Impedance:
Zbase = V² / S
Where V is in kV and S is in MVA
Actual Impedance:
Zactual = Zp.u. × Zbase