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Per-Unit Synchronous Reactance (Xd)

Convert the generator's ohmic synchronous reactance into a per-unit value using MVA, kV base.

Electrical
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Formula, assumptions, and limits

Zbase=kV2MVA,Xd,pu=Xd,ΩZbaseZ_\text{base} = \frac{kV^2}{MVA}, \quad X_{d,pu} = \frac{X_{d,\Omega}}{Z_\text{base}}
SymbolMeaningUnit
MVAMVARated apparent powerMVA
kVkVRated line-line voltagekV
XdX_dSynchronous reactanceΩ or pu

Source: IEC 60034-4 - Synchronous machine test methods

In short

Convert the generator's ohmic synchronous reactance into a per-unit value using MVA, kV base.

Learn the theory Marine Electrical Generation and Distribution