// multi-utility computation suite · offline · instant · precise
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eng.short-circuit-MVA-method Calculator
Calculates short circuit MVA and fault current at a bus from system impedance data using the MVA method. Short circuit MVA must be calculated to size circuit breakers — breakers must interrupt fault current without damage.
Inputs
V Kv
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Z Pu
Total opposition to AC current — combines resistance and reactance from capacitors/inductors.
Mva Base
Reference formula or conversion factor shown for context.
Results
short-circuit current Isc (kA)
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
short-circuit MVA
Reference formula or conversion factor shown for context.
actual impedance Z (Ω)
Total opposition to AC current (Ω), combining resistance and reactance. Z = √(R² + X²). Maximum power transfer occurs when source and load impedances match.
Isc = MVA_base / (√3 · V_kV · Z_pu)
Voltage in kilovolts (kV). 1 kV = 1,000 V. Used for high-voltage transmission lines and industrial equipment.
protection implication
The value at the specified point or condition.
voltage per unit on base
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.