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Short-Circuit Current (IEC 61363)

Peak and RMS symmetrical short-circuit currents on a shipboard bus - IEC 61363-1 approach for switchgear sizing.

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Formula, assumptions, and limits

Ik=IbaseXd,ip=κ2IkI''_k = \frac{I_\text{base}}{X''_d}, \quad i_p = \kappa \cdot \sqrt{2} \cdot I''_k
SymbolMeaningUnit
IbaseI_\text{base}Base current = MVA/(√3·V)A
XdX''_dSub-transient reactance pupu
κκPeak factor
IkI''_kRMS symmetrical SCA
ipi_pPeak SCA

Source: IEC 61363-1 - Short-circuit calculation for shipboard installations

In short

Peak and RMS symmetrical short-circuit currents on a shipboard bus - IEC 61363-1 approach for switchgear sizing.

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