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Let us go on modifying Zbus by including nodes and the elements connected to it one by
one as given in the textbook
step-1 type1 modification
Zbus=
0.25
step-2 type2 modification
Zbus=
0.25 0.25
0.25 0.35
step-3 type2 modification
Zbus=
0.25 0.25 0.25
0.25 0.35 0.25
0.25 0.25 0.35
step-4 type3 modification
Zbus=
0.1458333 0.1041667 0.1458333
0.1041667 0.1458333 0.1041667
0.1458333 0.1041667 0.2458333
This is the final Zbus matrix after including all the elements
step-5 type4 modification
Zbus=
0.1397059 0.1102941 0.125
0.1102941 0.1397059 0.125
0.125 0.125 0.175
opening a line between 2-3 is equivalent to connecting (-0.1) between bus3 bus2
Zbus=
0.1458333 0.1041667 0.1458333
0.1041667 0.1458333 0.1041667
0.1458333 0.1041667 0.2458333
(same as in step 4)
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