A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters: R, = 18 Q, X, = 25 0, R, = 180 mQ, X, = 250 mQ, R,, = 15 kQ, and X,, = 25 kQ. If the open-circuit and short-circuit tests are performed on this transformer, what are the readings of the instruments in each case? From the data given in above, determine the rating of the transformer at maximum efficiency. What is the maximum efficiency of the transformer at unity power factor? What is the efficiency at full load and unity power factor?
A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters: R, = 18 Q, X, = 25 0, R, = 180 mQ, X, = 250 mQ, R,, = 15 kQ, and X,, = 25 kQ. If the open-circuit and short-circuit tests are performed on this transformer, what are the readings of the instruments in each case? From the data given in above, determine the rating of the transformer at maximum efficiency. What is the maximum efficiency of the transformer at unity power factor? What is the efficiency at full load and unity power factor?
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 3.9P
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A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters:
R, = 18 Q, X, = 25 0, R, = 180 mQ, X, = 250 mQ, R,, = 15 kQ, and
X,, = 25 kQ. If the open-circuit and short-circuit tests are performed on
this transformer, what are the readings of the instruments in each case?
From the data given in above, determine the rating of the transformer
at maximum efficiency. What is the maximum efficiency of the
transformer at unity power factor? What is the efficiency at full load and
unity power factor?
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isnt Transformer ration V1 / V2 i see the opposite is here V2 / V1
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