initial commit / add all books

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diff --git a/83/CH9/EX9.9/example_9_9.sce b/83/CH9/EX9.9/example_9_9.sce
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+//Chapter 9
+//Example 9.9
+//page 362
+//To find postfault currents and voltages
+clear;clc;
+
+disp("The Thevenin passive network for this system is drawn in Example_9_8 (or fig 9.28 in the textbook)");
+disp("Using the Zbus matrix from the results of example_9_8,we can calculate post fault currents and voltages");
+Zbus=%i*[0.1397059 0.1102941 0.125;0.1102941 0.1397059 0.125;0.125 0.125 0.175]
+
+//to find fault current
+V30=1;V10=1;V20=1;
+If=(V30/(Zbus(3,3)+0));
+printf('\nIf=-j%0.2f pu\n',abs(If));
+
+
+//to find postfault voltages
+V1f=V10-(Zbus(1,3)/Zbus(3,3));
+V2f=V20-(Zbus(2,3)/Zbus(3,3));
+printf('\nV1f=%0.3f',V1f);
+printf('\nV2f=%0.3f',V2f);
+
+//to find fault currents in the TL
+I12f=(V1f-V2f)/(%i*0.1);
+I13f=(V1f-0)/(%i*0.1);
+I23f=(V2f-0)/(%i*0.1);
+printf('\n\nI12f=%d',I12f);
+printf('\nI13f=-j%0.2f',abs(I13f));
+printf('\nI23f=-j%0.2f',abs(I23f));
+
+//to find generator currents during faults
+Eg1=1;Eg2=1;
+Ig1f=(Eg1-V1f)/(0.2*%i+0.05*%i);
+Ig2f=(Eg2-V2f)/(0.2*%i+0.05*%i);
+printf('\n\nIg1f=-j%0.2f',abs(Ig1f));
+printf('\nIg2f=-j%0.2f\n\n',abs(Ig2f));
\ No newline at end of file
diff --git a/83/CH9/EX9.9/result_example_9_9.txt b/83/CH9/EX9.9/result_example_9_9.txt
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+ 
+ 
+ The Thevenin passive network for this system is drawn in Example_9_8 (or fig 9.28 in the textbook)   
+ 
+ Using the Zbus matrix from the results of example_9_8,we can calculate post fault currents and voltages   
+ Zbus  =
+ 
+    0.1397059i    0.1102941i    0.125i  
+    0.1102941i    0.1397059i    0.125i  
+    0.125i        0.125i        0.175i  
+
+If=-j5.71 pu
+
+V1f=0.286
+V2f=0.286
+
+I12f=0
+I13f=-j2.86
+I23f=-j2.86
+
+Ig1f=-j2.86
+Ig2f=-j2.86
+
+