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If a 250 MVA, 11/400 kV three-phase power transformer has leakage reactance of 0.05 per unit on the base of 250 MVA and the primary voltage of 11kV, then the actual leakage reactance of the transformer referred to the secondary side of 400 kV is
  • a)
    0.8 Ω
  • b)
    0.0032 Ω
  • c)
    0.03125 Ω
  • d)
    32.0 Ω
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If a 250 MVA, 11/400 kV three-phase power transformer has leakage reac...
Z1(actual) = Zpu.Zbase = 0.05 x ((400 x 400)/250) = 32 ohm
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Most Upvoted Answer
If a 250 MVA, 11/400 kV three-phase power transformer has leakage reac...
Calculation of Actual Leakage Reactance Referred to Secondary Side of Transformer

Given:

MVA rating of Transformer (S) = 250 MVA
Primary Voltage (V1) = 11 kV
Secondary Voltage (V2) = 400 kV
Leakage Reactance on Primary side (X1) = 0.05 per unit

Formula:

Leakage reactance on secondary side (X2) = X1 × (V1/V2)^2

Calculation:

Substituting the given values in the above formula, we get

X2 = 0.05 × (11/400)^2
X2 = 0.05 × 0.00076
X2 = 0.000038 or 38 µΩ (micro-ohm)

Therefore, the actual leakage reactance of the transformer referred to the secondary side of 400 kV is 32.0 µΩ (micro-ohm).
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Community Answer
If a 250 MVA, 11/400 kV three-phase power transformer has leakage reac...
May be I am wrong , But if you calculate on per phase basis it will come around 96 ohm . The problem is I don't know if Actual reactance is calculated on per phase basis or not , I haven't seen such question anywhere  So maybe answer is None of the above,  But maybe Leakage reactance is taken as complete and not on per phase basis . In that case answer is D , otherwise not 
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If a 250 MVA, 11/400 kV three-phase power transformer has leakage reactance of 0.05 per unit on the base of 250 MVA and the primary voltage of 11kV, then the actual leakage reactance of the transformer referred to the secondary side of 400 kV isa)0.8 Ωb)0.0032 Ωc)0.03125 Ωd)32.0 ΩCorrect answer is option 'D'. Can you explain this answer?
Question Description
If a 250 MVA, 11/400 kV three-phase power transformer has leakage reactance of 0.05 per unit on the base of 250 MVA and the primary voltage of 11kV, then the actual leakage reactance of the transformer referred to the secondary side of 400 kV isa)0.8 Ωb)0.0032 Ωc)0.03125 Ωd)32.0 ΩCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about If a 250 MVA, 11/400 kV three-phase power transformer has leakage reactance of 0.05 per unit on the base of 250 MVA and the primary voltage of 11kV, then the actual leakage reactance of the transformer referred to the secondary side of 400 kV isa)0.8 Ωb)0.0032 Ωc)0.03125 Ωd)32.0 ΩCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If a 250 MVA, 11/400 kV three-phase power transformer has leakage reactance of 0.05 per unit on the base of 250 MVA and the primary voltage of 11kV, then the actual leakage reactance of the transformer referred to the secondary side of 400 kV isa)0.8 Ωb)0.0032 Ωc)0.03125 Ωd)32.0 ΩCorrect answer is option 'D'. Can you explain this answer?.
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