Xcos examples from textbooks and for blocksHEADmaster

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diff --git a/Working_Examples/83/CH12/EX12.2/example_12_2.sce b/Working_Examples/83/CH12/EX12.2/example_12_2.sce
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+//Chapter 12
+//Example 12.1
+//page 448
+//To calculate steady state power limit
+clear;clc;
+
+Xdg=1*%i;  //generator's
+Xdm=1*%i;  //motor's
+Xt=0.1*%i; //transformers
+Xl=0.25*%i; //transmission line's
+Xc=-1*%i; //static capacitor's
+Xi=1*%i; //inductive reactor
+Eg=1.2; //generator's internal voltage
+Em=1; //motor's internal voltage
+
+//case(i) steady state power limit without reactor
+P1=(abs(Eg)*abs(Em))/(abs(Xdg+Xt+Xl+Xt+Xdm));
+printf('\n\n Steady state power limit without reactor = %0.5f pu',P1);
+
+//case(ii) steady state power limit with capacitive reactor
+//three arms of star connected reactances are
+Xa=Xdg+Xt+Xl; //from generator side
+Xb=Xdm+Xt;   //from load side
+Xc=Xc; //from reactor side
+
+//converting star to delta
+//reactance between generator side to load side is
+Xab=(Xa*Xb+Xb*Xc+Xc*Xa)/Xc;
+//power limit is
+P2=(abs(Eg)*abs(Em))/(abs(Xab));
+printf('\n\n Steady state power limit with capacitive reactor = %0.5f pu',P2);
+
+//case(iii) steady state power limit with inductive reactor
+//three arms of star connected reactances are
+Xa=Xdg+Xt+Xl; //from generator side
+Xb=Xdm+Xt;   //from load side
+Xc=Xi; //from reactor side
+
+//converting star to delta
+//reactance between generator side to load side is
+Xab=(Xa*Xb+Xb*Xc+Xc*Xa)/Xc;
+//power limit is
+P3=(abs(Eg)*abs(Em))/(abs(Xab));
+printf('\n\n Steady state power limit with inductive reactor = %0.5f pu',P3);
+
diff --git a/Working_Examples/83/CH12/EX12.2/result_example_12_2.txt b/Working_Examples/83/CH12/EX12.2/result_example_12_2.txt
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+ 
+
+ Steady state power limit without reactor = 0.48980 pu
+
+ Steady state power limit with capacitive reactor = 1.24352 pu
+
+ Steady state power limit with inductive reactor = 0.30496 pu