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Question

Determine the approximate equivalent circuit as viewed from (a) the high-voltage side and (b) the low-voltage side. Also draw the exact equivalent circuit. 14. A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters: r1 = 15 Ω, x1 = 250 mΩ, r2 = 15 mΩ, x2 = 25 mΩ, Rc = 180 mΩ. 15. If the open-circuit and short-circuit tests are performed on a 25 kVA, 2800/160-V, 50-Hz transformer was tested, the following data were obtained: Open-circuit test: Voltage 160, Current 10.8, Power (W) 150 Short-circuit test: Voltage 109, Current 8.4, Power (W) 160 In Exercise 14, determine the rating of the transformer from the data given. What is the maximum efficiency of the transformer? What is the efficiency at full load and unity power factor?

          Determine the approximate equivalent circuit as viewed from (a) the high-voltage side and (b) the low-voltage side. Also draw the exact equivalent circuit. 14. A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters: r1 = 15 Ω, x1 = 250 mΩ, r2 = 15 mΩ, x2 = 25 mΩ, Rc = 180 mΩ. 15. If the open-circuit and short-circuit tests are performed on a 25 kVA, 2800/160-V, 50-Hz transformer was tested, the following data were obtained:

Open-circuit test: Voltage 160, Current 10.8, Power (W) 150
Short-circuit test: Voltage 109, Current 8.4, Power (W) 160

In Exercise 14, determine the rating of the transformer from the data given. What is the maximum efficiency of the transformer? What is the efficiency at full load and unity power factor?

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