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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);