Transformer short circuit fault current calculator

*The following calculator is for reference only.

Transformer rating (S) in kVA
Voltage rating (VLL) in V
Impedance (Z%)
Fault current in kA
Three-phase
Phase-to-phase
Phase-to-neutral
Phase-to-earth
Equations
Three-phase,
$$\ I_{3p}=\frac{S}{\sqrt{3}\times{V_{LL}}\times{Z_1}} $$
Phase-to-phase,
$$\ I_{pp}=\frac{S}{V_{LL}\times({Z_1+Z_2})} $$
Phase-to-neutral,
$$\ I_{pn}=\frac{3\times{S}}{\sqrt{3}\times{V_{LL}}\times({Z_0+Z_1+Z_2})} $$
Phase-to-earth,
$$\ I_{pe}=\frac{3\times{S}}{\sqrt{3}\times{V_{LL}}\times({Z_0+Z_1+Z_2})} $$
Where, Z0, Z1, and Z2 are the zero, positive and negative sequence impedances.