Generator Fault Current Calculator

Welcome! This calculation is for the generator fault current given a generator power rating, rated voltage, and impedance in base percentage. 
Fault currents can occur in a circuit due for several reasons. Knowing this value can provide valuable information for rectifying and diagnosing problems in a circuit. As well as helping you to make appropriate design choices for electrical components.
CalculationInputs﻿﻿Sg 
:30kVA​
﻿
﻿﻿Vg 
:500volts​
﻿
﻿﻿Z, %
:15​
﻿
Output﻿﻿I (fault) 
:0.230946882kA​
﻿
ExplanationFault currents occur as a result of low-impedance short circuits. As a generator is an electrical machine, it can occur when a short to ground is created, phases are crossed or other similar scenarios. The magnitude of the generator fault current depends on several technical specifications.
﻿
Ifault=Sg×1003VgZI_{fault} = \frac{Sg \times 100}{ \sqrt 3  Vg  Z }Ifault​=3​VgZSg×100​
Where: 
﻿
Ifault=fault current (kA)Sg=Generator power rating (kVA)Vg=Generator rated voltage (V)Z=Percentage generator impedance (%)I_{fault} = fault \: current \: (kA) \\ Sg = Generator \: power \: rating \: ( kVA ) \\ Vg = Generator \: rated \: voltage \: (V) \\ Z  = Percentage \: generator \: impedance \: (\%)Ifault​=faultcurrent(kA)Sg=Generatorpowerrating(kVA)Vg=Generatorratedvoltage(V)Z=Percentagegeneratorimpedance(%)
Related ResourcesCheck out our full library of CalcTree templates here!
Capacitor Reactance 
Inductor Reactance 
Power (DC Circuits) 
﻿
﻿