[ I_base = \frac10 \times 10^6\sqrt3 \times 13.8 \times 10^3 = 418.4 , \textA ] [ I_f = 11.11 \times 418.4 = 4648 , \textA \quad (\textsymmetrical RMS) ]
( Z_th = 0.01 + 0.08 = 0.09 , \textpu )
[ Z_util = \fracS_baseS_sc = \frac101000 = 0.01 , \textpu ] fault current calculation
( Z_Tx = 0.08 , \textpu ) (already on 10 MVA base). [ I_base = \frac10 \times 10^6\sqrt3 \times 13