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( I_f = 1.0 / 0.09 = 11.11 , \textpu )
[ I_f = \fracV_thZ_th ] where ( V_th ) is the prefault voltage at the fault point (usually 1.0 pu), and ( Z_th ) is the Thevenin equivalent impedance seen from the fault point (resistance + reactance). In high-voltage systems, resistance is often neglected, giving: fault current calculation
( Z_th = 0.01 + 0.08 = 0.09 , \textpu )
[ Z_util = \fracS_baseS_sc = \frac101000 = 0.01 , \textpu ] ( I_f = 1
( S_base = 10 , \textMVA ), ( V_base, HV = 115 , \textkV ), ( V_base, LV = 13.8 , \textkV ). resistance is often neglected
( Z_Tx = 0.08 , \textpu ) (already on 10 MVA base).