Base Quantity Calculator

Inputs

Base Apparent Power (S_base)

MVA

Base Voltage (V_base, line-to-line)

Formulas Used

I_base = S_base / (√3 × V_base)

Z_base = V_base² / S_base

Y_base = 1 / Z_base

Where S_base is in VA, V_base is line-to-line voltage in V.

About This Calculator

This calculator computes the derived base quantities used in per-unit analysis of three-phase power systems. Enter the base apparent power and line-to-line base voltage to obtain the corresponding base current, impedance, and admittance.

For background on the per-unit system and base quantities, see the article: Per-Unit System: Base Quantities and Their Relationships.