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A transformer is rated at 11 kV/0.4 kV, 500 KVA, 5% reactance. What is the short circuit MVA of the transformer when connected to an infinite bus?
  • a)
    20 MVA
  • b)
    10 MVA
  • c)
    15 MVA
  • d)
    5 MVA
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A transformer is rated at 11 kV/0.4 kV, 500 KVA, 5% reactance. What is...
Concept:
Short circuit MVA =
Where,
MVAbase = Full load or base MVA
Xpu = Per unit reactance
Calculation:
Given that, MVAbase = 500 kVA = 0.5 MVA, Xpu= 5% = 0.05
Since the transformer is connected to an infinite bus, the p.u. the reactance of the circuit will be 0.05 i.e., the p.u. reactance offered by the transformer.
∴ short circuit MVA can be calculated as
Short circuit MVA =
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