Impedance of single phase, two winding transformer referred to primary side is 0.1 + j 0.6 p.u. The rating of the transformer is 200 V/400 V, 1 kVA. The per unit impedance is calculated on transformer base, then what is the equivalent impedance of transformer referred to secondary in ohms?
- A. 80 + j 400 Ω
- B. 5 + j 25 Ω
- C. 16 + j 80 Ω
- D. None of the above
Answer: D. None of the above
Explanation: Base impedance on secondary Zb,sec = (400 V)² / 1000 VA = 160 Ω. Secondary equivalent impedance = (0.1 + j0.6) × 160 = 16 + j96 Ω (Option d 'None of the above').