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// Example 2.11
// Computation of transformer regulation
// Page No. 71
clc;
clear;
close;
// Given data
S=10; // Transformer actual rating 10KVA
Srated=25; // Rated 25KVA
PF=0.65; // Power factor lagging
RPU=0.0124; // Percent resistance drop
XPU=0.014; // Percent reactance drop
// Transformer regulation
SPU=S/Srated;
SPU=SPU*100;
Theta=acosd(PF);
// Transformer regulation
RegPU=sqrt( ( (RPU*SPU+PF)^2)+ ((XPU*SPU+sind(Theta))^2))-1;
// Transformer regulation in percentage
RegPU_Per=RegPU*100;
// Display result on command window
printf("\n Transformer regulation = %0.3f ",RegPU);
printf("\n Transformer regulation in percentage= %0.1f ",RegPU_Per);
// Answer varies due to round off errors
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