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+//Calculate voltage regulation of transformer //Chapter 3
+//Example 3.31
+//page 237
+clear;
+clc;
+disp("Example 3.31")
+kVA=500;                    //rating of the transformers
+V1=3300;                    //primary voltage in volts
+V2=500;                    //secondary voltage in volts
+f=50;                      //frequency in hertz
+MAXeffi=0.97;        
+x=0.75;                    //fraction of full load for maximium efficiency
+pf1=1;
+output1=(kVA*x*pf1*1000);
+printf("Output at maximium efficiency=%dwatts",output1);
+losses=((1/MAXeffi)-1)*output1;
+printf("\nThus, at maximium efficiency,\n  lossses=%fW",losses)
+Culoss=losses/2;
+printf("\nCopper losses at 75percent of full load=%dW",Culoss);
+CulossFL=Culoss/x^2;
+printf("\nCopper losses at full load=%dW",CulossFL);
+Re=CulossFL/(kVA*1000);
+Ze=0.1;                        //equivalent impedence per unit
+Xe=sqrt(Ze^2-Re^2);
+phi=acosd(0.8);
+reg=((Re*cosd(phi))+(Xe*sind(phi)))*100;
+printf("\npercentage regulation=%f percent",reg);