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//Calculate voltage regulation of transformer //Chapter 3
//Example 3.31
//page 237
clear;
clc;
disp("Example 3.31")
kVA=500; //rating of the transformers
V1=3300; //primary voltage in volts
V2=500; //secondary voltage in volts
f=50; //frequency in hertz
MAXeffi=0.97;
x=0.75; //fraction of full load for maximium efficiency
pf1=1;
output1=(kVA*x*pf1*1000);
printf("Output at maximium efficiency=%dwatts",output1);
losses=((1/MAXeffi)-1)*output1;
printf("\nThus, at maximium efficiency,\n lossses=%fW",losses)
Culoss=losses/2;
printf("\nCopper losses at 75percent of full load=%dW",Culoss);
CulossFL=Culoss/x^2;
printf("\nCopper losses at full load=%dW",CulossFL);
Re=CulossFL/(kVA*1000);
Ze=0.1; //equivalent impedence per unit
Xe=sqrt(Ze^2-Re^2);
phi=acosd(0.8);
reg=((Re*cosd(phi))+(Xe*sind(phi)))*100;
printf("\npercentage regulation=%f percent",reg);
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