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The impedance of Δ/Y, 11 kV/400 V transformer of capacity 100 kVA, on its name plate data base is (0.02 + j 0.07) pu. The ohmic impedance per phase referred to the primary (11 kV) side is

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  1. (0.02 + j 0.07) ohm
  2. (0.55 + j 1.925) ohm
  3. (42 + j 147) ohm
  4. (72.6 + j 254.1) ohm

Answer (Detailed Solution Below)

Option 4 : (72.6 + j 254.1) ohm
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Q3.A 10 kVA 500/100 V transformer has the resistance referred to primary is 0.3 Ω. The equivalent resistance of transformer referred to secondary is:
Q4.The impedance of Δ/Y, 11 kV/400 V transformer of capacity 100 kVA, on its name plate data base is (0.02 + j 0.07) pu. The ohmic impedance per phase referred to the primary (11 kV) side is

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