SOURCE-LED REFERENCE NOTES

Substation Transformer kVA Sizing, Short-Circuit MVA & Protection

Sizing main plant step-down power transformers (kVA/MVA), impedance % selection, and calculating secondary symmetrical short-circuit current.

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Substation Transformer kVA Sizing, Short-Circuit MVA & Protection

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1. Short-Circuit Current (I_sc)

I_sc (kA) = [ Secondary Full Load Amps ] / [ %Impedance / 100 ]
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