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The impedance value of generator is 0.2 pu on a base value of 11 kV, 50 MVA. The impedance value for a base value of 22 KV, 150 MVA is
  • a)
    0.15
  • b)
    0.2 pu
  • c)
    0.3 pu
  • d)
    2.4 pu
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The impedance value of generator is 0.2 pu on a base value of 11 kV, 5...
Explanation:



Given:


Impedance value of generator = 0.2 pu


Base value of generator = 11 kV, 50 MVA


Base value of new system = 22 kV, 150 MVA



Conversion of impedance value to new base value:


Impedance value on new base = (Impedance value on old base) * (Old base/ New base)^2


Impedance value on new base = 0.2 * (11/22)^2


Impedance value on new base = 0.15 pu



Conclusion:


The impedance value for a base value of 22 KV, 150 MVA is 0.15 pu, which is option A.
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The impedance value of generator is 0.2 pu on a base value of 11 kV, 50 MVA. The impedance value for a base value of 22 KV, 150 MVA isa)0.15b)0.2 puc)0.3 pud)2.4 puCorrect answer is option 'A'. Can you explain this answer?
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