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// Example 2.6
// Computation of (a) Equivalent input impedance of the transformer and load
// combination (b) Primary current when 2400V is supplied to primary
// (C) Voltage across the load
// Page No. 61
clc;
clear;
close;
// Given data
S=37500; // Transformer ratings
VHS=2400; // High side voltage
VLS=600; // Low side voltage magnitude
ZloadLS_Mag=10; // Low side load impedance magnitude
ZloadLS_Ang=20; // Low side load impedance angle
Req=2.8; // Equivalent resistance
Xeq=6; // Equivalent reactance
VT=2400; // Primary voltage supplied
// (a) Equivalent input impedance of the transformer and load combination
a=VHS/VLS; // Ratio of High side and low side voltages
ZloadHS_Mag=a^2*ZloadLS_Mag; // High side load impedance magnitude
ZloadHS_Ang=ZloadLS_Ang; // High side load impedance angle
// Polar to Complex form
ZloadHS_R=ZloadHS_Mag*cos(-ZloadHS_Ang*%pi/180); // Real part of complex number
ZloadHS_I=ZloadHS_Mag*sin(ZloadHS_Ang*%pi/180); //Imaginary part of complex number
Zin=Req+%i*Xeq+ZloadHS_R+%i*ZloadHS_I;
// Complex to Polar form...
Zin_Mag=sqrt(real(Zin)^2+imag(Zin)^2); // Magnitude part
Zin_Ang = atan(imag(Zin),real(Zin))*180/%pi; // Angle part
// (b) Primary current when 2400V is supplied to primary
IHS_Mag=VT/Zin_Mag; // Primary current magnitude
IHS_Ang=0-Zin_Ang; // Primary current angle
// (c) Voltage across the load
EHS_Mag= IHS_Mag*a^2*ZloadLS_Mag; // Magnitude of voltage across reflected load
EHS_Ang=IHS_Ang+ZloadLS_Ang; // Angle of voltage across reflected load
ELS_Mag=EHS_Mag/a; // Magnitude of actual voltage across real load
ELS_Ang=EHS_Ang; // Angle of actual voltage across real load
//Display result on command window
printf("\n Equivalent input impedance of the transformer and load combination magnitude = %0.2f Ohm ",Zin_Mag);
printf("\n Equivalent input impedance of the transformer and load combination angle = %0.2f deg ",Zin_Ang);
printf("\n Primary current magnitude = %0.2f A ",IHS_Mag);
printf("\n Primary current angle = %0.2f deg ",IHS_Ang);
printf("\n Actual input voltage magnitude = %0.1f V", ELS_Mag);
printf(" \n Actual input voltage angle = %0.2f deg",ELS_Ang);
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