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+//Caption:Calculate the parameters reffered to LV Side and also find the voltage regulation at full load and efficiency of transformer at full load and half load at 0.8pf lagging

+//Exa:3.14

+clc;

+clear;

+close;

+a=0.5;

+V1=200;//in volts

+I_o=0.8;//in amperes

+W_o=75;//in watts

+pf=W_o/(V1*I_o);

+pf2=0.8;

+R_O=V1/(I_o*pf);

+X_O=V1/(I_o*sqrt(1-pf^2));

+V_sc=20;//in volts

+I_sc=10;//in amperes

+P_sc=90;//in watts

+Z_O2=V_sc/I_sc;

+R_O2=P_sc/I_sc^2;

+X_O2=sqrt(Z_O2^2-R_O2^2);

+R_O1=a^2*R_O2;

+X_O1=a^2*X_O2;

+I_2=4000/400;//in amperes

+VR=I_2*(R_O2*pf2+X_O2*sqrt(1-pf2^2))/400;

+disp(R_O,'R_O (in ohms)=');

+disp(X_O,'X_O Magnetising reactance (in ohms)=');

+disp(R_O1,'Equivalent Resistance reffered to LV Side (in ohms)=');

+disp(X_O1,'Equivalent Reactance reffered to LV Side (in ohms)');

+disp(VR*100,'Voltage Regulation at full load (in %)=');

+P_o=(400-I_2*(R_O2*pf2+X_O2*sqrt(1-pf2^2)))*I_2*pf2;

+P_i=75;//in watts

+P_cu=P_sc;

+P_cu_h=0.5^2*P_cu;

+Eff=P_o/(P_o+P_i+P_cu);

+disp(Eff*100,'Efficiency at full load (in %)=');

+P_o_h=(400-I_2*0.5*(R_O2*pf2+X_O2*sqrt(1-pf2^2)))*I_2*0.5*pf2;

+Eff_h=P_o_h/(P_o_h+P_i+P_cu_h);

+disp(Eff_h*100,'Efficiency at half load (in %)=');
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