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// Example 2.9
// Computation of (a) Transformer regulation (b) Secondary voltage when the
// load is disconnected (c) Input primary voltage
// Page No. 69
clc;
clear;
close;
// Given data
FP=0.75 // Power-factor lagging
RPU=0.013; // Percent resistance
XPU=0.038; // Percent reactance
Vrated=600; // Rated voltage of transformer
TTR=12; // Transformer turns ratio (7200/600)
ELS=621; // Low side voltage
// (a) Transformer regulation
Theta=acosd(FP);
// Transformer regulation
RegPU=sqrt( ( (RPU+FP)^2)+ ((XPU+sind(Theta))^2))-1;
// Transformer regulation in percentage
RegPU_Per=RegPU*100;
// (b) Secondary voltage when the load is disconnected
Vnl=(RegPU*Vrated)+Vrated;
// (c) Input primary voltage
EHS=ELS*TTR;
// Display result on command window
printf("\n Transformer regulation = %0.3f ",RegPU);
printf("\n Secondary voltage when the load is disconnected = %0.0f V", Vnl);
printf(" \n Input primary voltage = %0.0f V",EHS);
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