A generator is connected to an infinite bus through a double circuit line as shown
The admittance matrix Y is given by1
\(\left[ {\begin{array}{*{20}{c}} {j5}&0&{ - j5}\\ 0&{j5}&{ - j5}\\ { - j5}&{ - j5}&{j10} \end{array}} \right]\)
2
\(\left[ {\begin{array}{*{20}{c}} { - j5}&0&{j5}\\ 0&{ - j5}&{j5}\\ {j5}&{j5}&{ - j10} \end{array}} \right]\)
3
\(\left[ {\begin{array}{*{20}{c}} { - j5}&0&{ - j5}\\ 0&{j5}&{ - j5}\\ { - j5}&{ - j5}&{j10} \end{array}} \right]\)
4
\(\left[ {\begin{array}{*{20}{c}} { - j5}&{j10}&{j5}\\ {j10}&{ - j5}&{j5}\\ {j5}&{j5}&{ - j10} \end{array}} \right]\)