Calcolatrice Corrente di Cortocircuito Gratuita

Calcola la corrente di cortocircuito e il livello di guasto.

kVA
V
%

Prospective Short-Circuit Current

14,434 A

Full Load Current721.7 A
Short-Circuit Current14.43 kA

Prospective Short-Circuit Current vs Transformer Rating

Vedi formula →

Formula

## Transformer Short-Circuit Current The prospective short-circuit current at the transformer secondary is limited by the transformer impedance. ### Formulas **I_FL = kVA x 1000 / (sqrt(3) x V)** (full load current) **I_SC = I_FL / (Z%/100)** (short-circuit current) where Z% is the transformer impedance expressed as a percentage. This is the maximum fault current available at the transformer terminals, ignoring cable impedance downstream.

Esempio Risolto

A 500 kVA transformer, 400 V secondary, 5% impedance.

  1. 01I_FL = 500,000 / (1.732 x 400) = 721.7 A
  2. 02I_SC = 721.7 / 0.05 = 14,434 A = 14.43 kA
  3. 03Switchgear must have a breaking capacity above 14.43 kA.