Three-Phase Fault Analysis Calculator

Calculate symmetrical three-phase fault current using per-unit method for radial systems.

System base MVA for per-unit calculations.
MVA
System base kV (line-to-line).
kV
Available fault MVA from utility.
MVA
Transformer rating.
MVA
Transformer impedance.
%

Results

Base Current-A
Total Z (per-unit)-pu
Fault Current-A
Fault MVA-MVA
References: IEEE Std 141 (Red Book); IEEE Std 551 (Violet Book); Stevenson Power Systems