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A single line diagram of a power system is shown in the figure. The per unit values of line impedances are given. The sum of diagonal elements of YBUS matrix is
  • a)
    j0.55 pu
  • b)
    –j38 pu
  • c)
    j1.1 pu
  • d)
    j38 pu
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A single line diagram of a power system is shown in the figure. The pe...
Z12 = j0.18 pu ⇒ y12 = -j10 pu
Z13 = j0.25 pu ⇒ y13 = -j4 pu
Z23 = j0.2 pu ⇒ y23 = -j5 pu
Y11 = y12 + y13 = -j14 pu
Y22 = y21 + y23 = -j15 pu
Y33 = y31 + y32 = -j9 pu
Sum of diagonal elements = -j14 – j15 – j9
= -j38 pu
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A single line diagram of a power system is shown in the figure. The per unit values of line impedances are given. The sum of diagonal elements of YBUSmatrix isa)j0.55 pub)–j38 puc)j1.1 pud)j38 puCorrect answer is option 'B'. Can you explain this answer?
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