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Three synchronous generators, each of which is rated to 100 MVA, 11 KV, have an impedance per unit of 0.15. If all three generators are replaced by a single equivalent generator, what will be the effective per unit impedance of each generator?
  • a)
    0.45
  • b)
    0.15
  • c)
    0.025
  • d)
    0.05
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Three synchronous generators, each of which is rated to 100 MVA, 11 KV...
Using Thevenin's Theorem, Vth = V all the three impedances will be in parallel.
Single line diagram:
So, equivalent p.u. impedance of each generator is
Zth = Zn / 3 = 0.15 / 3 = 0.05 pu
Key Points
  • All generators are connected in parallel to increase current going to the line because all generators are at equal voltages.
  • Generators are shown with their impedances in a single line diagram.
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