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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 3 : TRANSFORMER AND PER UNIT SYSTEM
+// Example : 3.7
+clc;clear; // clears the console and command history 
+
+// Given data
+V_1 = 200      // primary voltage of transformer in V
+V_2 = 400      // secondary voltage of transformer in V
+R_1 = 0.3      // primary resistance in Ω
+X_1 = 0.6      // primary reactance in Ω
+R_2 = 0.8      // secondary resistance in Ω
+X_2 = 1.6      // secondary reactance in Ω
+I_2 = 10       // secondary supply current in A
+cos_phi2 = 0.8 // power factor lagging
+
+// caclulations 
+a = V_1/V_2          // turn ratio
+phi2 = acosd(0.8)
+sin_phi2 = sind(phi2)
+R_02 = R_2+(R_1/a^2) // total resistance referred to secondary side Ω
+X_02 = X_2+(X_1/a^2) // total reactance referred to secondary side Ω
+E_2 = (V_2*cos_phi2+I_2*R_02)+(%i*(V_2*sin_phi2+I_2*X_02)) // no-load voltage
+V_r = (abs(E_2)-V_2)/V_2*100                              // voltage regulation
+
+// display the result 
+disp("Example 3.7 solution");
+printf(" \n Voltage regulation \n V_r = %.0f percent \n", V_r);
+
+