Enter Base Values
Formulas
Zpu,new = Zpu,old × (MVAnew ÷ MVAold) × (kVold ÷ kVnew)2
Zbase = kVLL2 ÷ MVA3φ
Ibase = MVA3φ × 1000 ÷ (√3 × kVLL)
Example
An impedance of 0.10 pu on a 50 MVA, 13.8 kV base becomes 0.20 pu on a 100 MVA, 13.8 kV base.
Assumptions
The MVA values are total three-phase bases and voltage is line-to-line. Base voltages on opposite sides of a transformer should follow the transformer ratio.
A base conversion changes the numerical per-unit value, not the physical impedance.