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//Electric Power Generation, Transmission and Distribution by S.N.Singh
//Publisher:PHI Learning Private Limited
//Year: 2012 ; Edition - 2
//Example 16.2
//Scilab Version : 6.0.0 ; OS : Windows
clc;
clear;
Em=400; //Ac supply voltage in kV
Vd=500; //Dc supply voltage in kV
Id=1; //Dc current in A
alpha=20; //Firing angle in degree
Vdo=3*sqrt(3*2)*Em/(%pi*sqrt(3)); //Direct output voltage in kV
Rc=-(Vd-(Vdo*cosd(alpha))/Id); //Effective Commutation resistance in Ohm
printf("\nThe effective commutation resistance is %.2f Ohm",Rc);
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