How to calculate short circuit current rating in transformer || Fault level calculation

How to Calculate Short-Circuit Current:

First we must know these three values-
         X-mer Rating = ?
Secondary Voltage = ?
    % of Impedance = ?

Example:
         X-mer Rating- 1500 KVA
Secondary Voltage- 480 V
        % Impedance- 5.75%

Answer:
Formula:-  (a) Isc = FLA / % Z Impedance
(b) FLA= KVA / (√3)×(kVsec)

Put the value in this formula
FLA= 1500 / (√3)×(.480)
FLA= 1,804 Amps

Put value of FLA in Isc formula-
Isc = 1804*100
             5.75
Isc = 31373.91 amps

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