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// Regulation at full load p.f 0.8 lag
clc;
clear;
Pi=500*(10^3);// Power Input
Meff=97/100;// Max Efficiency
pf1=1;
E1=3300;
E2=500;
Po=Pi*pf1*3/4;
// Iron loss = Copper loss at maximum efficiency
x=poly([0 1],'x','c');
Pin=Po+(2*x);
xx=(Pin*Meff)-Po;
x=roots(xx); // Iron Loss = Copper Loss
I2=Po/E2;
R=x/(I2^2);
I2fl=Pi/E2;
Rfl=E2/I2fl;
// Per unit values
Rpu=R*100/Rfl;
Zpu=10;
Xpu=sqrt((Zpu^2)-(Rpu^2));
pf2=0.8; // Lagging
ang=acosd(pf2);// Positive Angle as it is lagging
perreg=(Rpu*cosd(ang))+(Xpu*sind(ang));
printf('The regulation at full load, p.f 0.8 lag = %f percent\n',perreg)
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