Short Circuit Calculator

Calculate short-circuit current from transformer capacity and percent impedance — free electrical engineering tool

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In = kVA / (√3 × Vs)

Isc = In / (%Z / 100)

Asymmetrical Isc_peak = Isc × 1.8

Transformer & Cable Parameters

Transformer Capacity (kVA)

Primary Voltage (V)

Secondary Voltage (V)

% Impedance (%Z)

Cable Impedance (Ω) (optional)

Results

Rated Secondary Current In

1374.6 A

Symmetrical Fault Current Isc

27493 A

(27.5 kA)

Asymmetrical Fault Current (peak)

49487 A

(49.5 kA)

Short-Circuit Capacity

10000.0 MVA

Transformer Z

4.410 m\u03A9

Cable Z

0.000 m\u03A9

Total %Z

5.00%

Required Breaker Interrupting Capacity

\u2265 50 kA