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+//to calculate syn chronous reactance ,leakage reactance,voltage regulation
+
+clc;
+If=[50 75 100 125 150 162.5 200 250 300];
+Voc=[6.2 8.7 10.5 11.6 12.8 13.7 14.2 15.2 15.9];
+plot(If,Voc);
+xlabel('If(A)');
+ylabel('Voc(V)');
+
+r=10*10^6;    //rating
+V=13000;
+Ia=r/(sqrt(3)*V);
+I_SC=688;    //corresponding to V
+Xs=V/(sqrt(3)*I_SC);disp(Xs,'sync reactance(ohm)');
+V_a=1200;
+Xl=V_a/(sqrt(3)*Ia);disp(Xl,'leakage reactance(ohm)');
+Ifar=90;
+Er=complex(V,sqrt(3)*Ia*Xl);
+If=185;    //corresponding to Er
+Iff=sqrt((If+Ifar*sind(40.5))^2+(Ifar*cosd(40.5))^2);
+Eff=15200;    //corresponding to Iff
+vr=(Eff/V-1)*100;disp(vr,'voltage regulation(%)');
+
+Xsadj=Xs*complex(.8,-.6);j=sqrt(-1);
+Ef=(V+sqrt(3)*Ia*Xsadj);
+If=(150/13)*abs(Ef);
+Vtoc=14800;    //corresponding to If
+vr=(Vtoc/V-1)*100;disp(vr,'voltage regulation(%)');