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//chapter 5
//example 5.9
//page 439
clear;
clc;
disp("example 5.9");
printf("\n");
OP=500000; //output power
V_l=3300; //line voltage
I_l=OP/(sqrt(3)*V_l); //line current
printf("line current= %fA\n",I_l);
//for star connected alternater, line current is equal to phase current
I_a=I_l;
pf=0.8; //power factor
phi=acosd(pf);
R_a=0.3; //synchronous resistance
X_s=4; //synchronous reactance
V_p=V_l/sqrt(3);
printf("phase voltage= %fV\n",V_p)
E=sqrt((V_p*cosd(phi)+I_a*R_a)^2+(V_p*sind(phi)+I_a*X_s)^2);
printf("induced emf= %f V/Phase\n",E )
PR=((E-V_p)*100)/V_p;
printf("percentage regulation= %f percent\n",PR);
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