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//Calculating secondary voltage and voltage regulation
//Chapter 3
//Example 3.16
//page 218
clear;
clc;
disp("Example 3.16")
kVA=10; //rating of the transformer
V1=2000; //primary voltage in volts
V2=400; //secondary voltage in volts
R1=5.5; //primary voltage in ohms
R2=0.2; //secondary voltage in ohms
X1=12; //primary reactance in ohms
X2=0.45; //secondary reactance in ohms
//assuming (V1/V2)=(N1/N2)
Re=R2+(R1*(V2/V1)^2);
printf("equivalent resistance referred to the secondary=%fohms",Re);
Xe=X2+(X1*(V2/V1)^2);
printf("equivalent reactance referred to the secondary=%fohms",Xe);
Ze=sqrt(Re^2+Xe^2);
printf("equivalent impedance referred to the secondary=%fohms",Ze);
phi=acosd(0.8);
Vl=374.5;
printf("\nVoltage across the full load and 0.8 p.f lagging=%fV",Vl);
reg=((V2-Vl)*100)/Vl;
printf("\npercentage voltage regulation=%f percent",reg);
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