Exercises4.13. The following data were obtained when a 25-kVA, 2300/460-V, 50-Hztransformer was tested:Voltage (V)Current (A)Power (W)Open-circuit test:Short-circuit test:4601.48460108.710.87709Determine the approximate equivalent circuit as viewed from (a) the high-voltage side and (b) the low-voltage side. Also draw the exact equivalentcircuit.A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters:18 N, X,4.14.250 m2, ReH15 kn, and= 180 mn, X225 kN. If the open-circuit and short-circuit tests are performed on25 N, R2%3DR1XmHthis transformer, what are the readings of the instruments in each case?From the data given in Exercise 4.14, determine the rating of the trans-former at maximum efficiency. What is the maximum efficiency of thetransformer at unity power factor? What is the efficiency at full load andunity power factor?%3D%3D%3D4.15.

Answered: Image /qna-images/answer/545d49b7-d427-4dd9-9969-9ce01d93df9c.jpg

Exercises 4.13. The following data were obtained when a 25-kVA, 2300/460-V, 50-Hz transformer was tested: Voltage (V) Current (A) Power (W) Open-circuit test: Short-circuit test: 460 1.48 460 108.7 10.87 709 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. ers:

Exercises 4.13. The following data were obtained when a 25-kVA, 2300/460-V, 50-Hz transformer was tested: Voltage (V) Current (A) Power (W) Open-circuit test: Short-circuit test: 460 1.48 460 108.7 10.87 709 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. ers:

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.30P: Reconsider Problem 3.29. If Va,VbandVc are a negative-sequence set, how would the voltage and...

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