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+//============================================================================
+//Chapter 6 Example 21
+
+
+clc;
+clear all;
+
+//variable declaration
+R       = 25;           //rate burden in VA
+Is      = 5;            //current in A
+r       = 6;            //Rs/Es ratio of resistance to reactance 
+IL      = 0.2;          //iron loss in W
+Im         = 1.5;       //magnetising compnent of current in A
+
+
+//calculations
+KT      = 100/5;            //turn ratio
+Es      = R/Is;             // Secondary rated voltage in V
+Zs      = Es/Is;            //total secondary impedance in Ω
+theta       = (atan(1/r))*180/%pi;        //angle in °
+Zs1          = (Zs*cos(theta*%pi/180))+(Zs*sin(theta*%pi/180))*%i;
+Ie          = KT*0.04;          //energy component of exciting current on primary side 
+r           = (((Im*sin(theta*%pi/180))+(Ie*cos(theta*%pi/180)))/((KT*Is)+(Ie*cos(theta*%pi/180))+(Im*sin(theta*%pi/180))))*100;      //percentage ratio error in %
+beta        = (180/%pi)*(((Im*cos(theta*%pi/180))-(Ie*sin(theta*%pi/180)))/(KT*Is));        //phase angle erro in  °
+
+//result
+mprintf("percentage ratio error  = -%3.1f percentage",r);
+mprintf("\nphase angle error = %3.4f °",beta);