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+//Electric Power Generation, Transmission and Distribution by S.N.Singh

+//Publisher:PHI Learning Private Limited

+//Year: 2012 ; Edition - 2 

+//Example 16.1

+//Scilab Version : 6.0.0    ; OS : Windows

+

+clc;

+clear;

+

+

+V=238;                                            //Transformer primary voltage in kV

+Em=110;                                           //Transformer secondary voltage in kV

+f=50;                                             //Supply frequency in Hz

+u=20;                                             //Commutation angle in degree

+alpha1=30;                                        //Delay angle 1 in degree

+alpha2=90;                                        //Delay angle 2 in degree

+alpha3=150;                                       //Delay angle 3 in degree

+Vdo=3*sqrt(3*2)*Em/(%pi*sqrt(3));                 //Direct output voltage in kV

+Vd1=Vdo/2*(cosd(alpha1)+cosd(alpha1+u));          //Direct output voltage when commutation angle 20 and delay angle is 30 degree in kV

+Vd2=Vdo/2*(cosd(alpha2)+cosd(alpha2+u));          //Direct output voltage when commutation angle 20 and delay angle is 90 degree in kV

+Vd3=Vdo/2*(cosd(alpha3)+cosd(alpha3+u));          //Direct output voltage when commutation angle 20 and delay angle is 150 degree in kV

+

+printf("\nThe direct voltage output is %.2f kV",Vdo);

+printf("\nThe direct voltage output when commutation angle 20 and delay angle is 30 degree is %.2f kV",Vd1);

+printf("\nThe direct voltage output when commutation angle 20 and delay angle is 90 degree is %.2f kV",Vd2);

+printf("\nThe direct voltage output when commutation angle 20 and delay angle is 150 degree is %.2f kV",Vd3);