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//Book - Power System: Analysis & Design 5th Edition
//Authors - J. Duncan Glover, Mulukutla S. Sarma, and Thomas J. Overbye
//Chapter - 7 ; Example 7.1
//Scilab Version - 6.0.0 ; OS - Windows
clc;
clear;
V = 20; //short ciruit voltage in kV
X = 8; //short circuit inductance in ohm
R = 0.8; //short ciruit resistance in ohm
t = 3; //no. of cycles after fault inception
Iac = V/(sqrt((X^2)+(R^2)))*1 //rms ac fault current in kA
K = sqrt(1+ (2*%e^(-4*%pi*(0.5)/10))); //asymmetry factor for 0.5 cycles
Imom = K*Iac; //rms momentart current at t=0.5 cycle in kA
K = sqrt(1+ (2*%e^(-4*%pi*(3)/10))); //asymmetry factor for 3 cycles
Irms = K*Iac; //rms asymmetrical fault current in kA
printf('\n The rms ac fault current Iac = %f kA',Iac);
printf('\n The rms momentary current at o.5 cycle Imom = %f kA',Imom);
printf('\n The rms asymmetrical fault current Irms = %f kA',Irms);
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