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//Book Name:Fundamentals of Electrical Engineering
//Author:Rajendra Prasad
//Publisher: PHI Learning Private Limited
//Edition:Third ,2014
//Ex7_3.sce.
clc;
clear;
T1=1000; //number of Primary turns
T2=200; //number of secondary turns
Is=250; //secodary load current in A
I0=3; //No load current in A
rp=0.72; //primary winding resistance in ohms
rs=0.025; //secondary winding resistance in ohms
xp=0.92; //primary winding leakage reactance in ohms
xs=0.036; //secondary winding leakage reactance in ohms
Vs=2.2e3; //supply voltage in volts
N=T1/T2; //turns ratio of transformer
Is_dash=Is/N;
rs_dash=N^2*rs;
xs_dash=N^2*xs;
cos_pi_s=0.8;
cos_pi_0=0.2;
sin_pi_s=sind(acosd(0.8));
sin_pi_0=sind(acosd(0.2));
Isdash=(Is_dash*cos_pi_s)-%i*(Is_dash*sin_pi_s);
Io=(I0*cos_pi_0)-%i*(I0*sin_pi_0);
Ip=Isdash+Io;
a=real(Ip);
b=imag(Ip);
Ip_mag=sqrt(a^2+b^2);
printf("\n Primary Current=%2.2f A \n",Ip_mag)
pi_p=atand(b/a);
printf("\n Power factor=%1.3f lagging \n",cosd(pi_p))
VL_dash=Vs-(Ip*(rp+%i*xp))-(Isdash*(rs_dash+%i*xs_dash)); //secondary terminal voltage referred to primary
VL_dash_mag=real(VL_dash);
VL=VL_dash_mag/N;
printf("\n Secondary terminal voltage=%3.1f V \n",VL)
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