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Power systems miscellaneous

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Power systems miscellaneous
  1. If a 75 MVA, 10 kV synchronous generator has Xd = 0.4 p.u, then Xd value (in p.u.) to a base of 100 MVA, 11 kV is ___________
    1. 44
    2. 0.44
    3. 4.4
    4. 0.04
Correct Option: B

Xd(new) = Xd(old) ×
KVold,base
² ×
MVAnew,base
KVnew,baseMVAold,base

= 0.4 ×
11
² ×
100
 = 0.44 pu.
1175


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