Following data are obtained by slip test on a salient pole machine: Idmax = 10 A, Idmin = 6.5 A, Vdmax = 30 V, Vdmin = 25 V. What is the direct axis reactance 'Xd' and quadrature axis reactance 'Xq'?
- A. Xd = 3 Ω, Xq = 3.86 Ω
- B. Xd = 4.61 Ω, Xq = 2.5 Ω
- C. Xd = 3 Ω, Xq = 2.5 Ω
- D. Xd = 4.61 Ω, Xq = 3.86 Ω
Answer: B. Xd = 4.61 Ω, Xq = 2.5 Ω
Explanation: From the slip test: Xd = Vdmax / Idmin = 30 / 6.5 ≈ 4.61 Ω; Xq = Vdmin / Idmax = 25 / 10 = 2.5 Ω.