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+//Chapter 12
+//Example 12.9
+//page 479
+//To calculate critcal clearing angle
+clear;clc;
+Pmax1=2; // prefault(2 lines)
+Pmax2=0.5; //deuring fault
+Pmax3=1.5; //post fault(1 line)
+Pm=1; //initial loading
+
+delta0=asin(Pm/Pmax1);
+delta_max=%pi-asin(Pm/Pmax3);
+
+//to find critical angle,using eq.12.67
+delta_cr=acos((Pm*(delta_max-delta0)-Pmax2*cos(delta0)+Pmax3*cos(delta_max))/(Pmax3-Pmax2));
+printf('Pmax1=%0.1f PU\t Pmax2=%0.2f PU\t Pmax3=%0.2f PU\n\n',Pmax1,Pmax2,Pmax3);
+printf('Delta0=%0.3f rad\n\n',delta0);
+printf('Delta_max=%0.3f rad\n\n',delta_max);
+printf('Delta_cr=%0.3f rad =%0.2f deg\n\n',delta_cr,delta_cr*180/%pi);