Short Circuit Calculation

Why not look it up in the original equipment manufacturer's Operation and Maintenance Manual?

1. Get Transformer and Genset impedances.
2. Take any Base Kv & Kva
3. convert them into per unit impedances
4. Draw the single line diagram
5. Apply fault at any node on the single line diagram
6. Apply Theveniz theorem to get fault current in per Unit value in unit less.
7. Actual fault current in Amps is obtained by dividing base current by fault per unit current.
8. If you find difficulty then display the single line diagrams with their impedances on this forum.I will calculate the fault currents and indicate on the forum.

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Use this method http://ecmweb.com/mag/electric_shortcircuit_calculation_methods/?smte=wr

best is to follow hussainin's step's...and for easier approach..use a therr-phase short circuit calculation...these yields an acceptable values for you to size up your OCPD's...g'luck

Transformer:

Fault Current = FLC of transformer / % Impedance of the transformer

Generator:

Fault Current = FLC of generator / % sub-transient reactance of the generator