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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);
+
+
+
+
+
+
+