35. Three single-phase transformers, cach of 100 kVA rating, are connected in a closed-delta arrangement. If one of them is taken out, it would be possible to load the bank in such a manner that cach one is loaded to the extent of: A 86.6 kVA C. 57.7KVA B. 66.7 kVA D. 33.33 kVA
35. Three single-phase transformers, cach of 100 kVA rating, are connected in a closed-delta arrangement. If one of them is taken out, it would be possible to load the bank in such a manner that cach one is loaded to the extent of: A 86.6 kVA C. 57.7KVA B. 66.7 kVA D. 33.33 kVA
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 3.26P: A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a...
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Question
Transcribed Image Text:Transkrmers
phase with each
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35. Three single-phase transformers, cach of 100 kVA rating, are conected in a closed-delta
arrangement. If one of them is taken out, it would be possible to load the bank in such a manner that
cach one is loaded to the extent of:
A 86.6 kVA
C. 57.7KVA
B. 66.7 kVA
D. 33.33 kVA
when load is at unity power factor.
36. Average power factor at which V-V bank separate is
A 86.6%
C. 66.67%
В. 73.3%
D. None of these
37. Scott connections are used for:
A. single-phase to three-phase transformation
C. three-phase to two-phase transformation
B. three-phase to single-phase transformation
(D Any of the above
38. The current in low voltage winding of a 25 kVA, 6600/400 V, 50 Hz, 3-phase Y-A transformer, at
full load is:
A 36 A
Č. 65,32 A
B. 20.78 A
D. 40.2 A
39. The current in high voltage winding of a 20 kVA, 2200/220 V, 50 Hz, 3-phase A-A transformer, at
full load is:
(A. 3.03 A
C. jo.5 A
B. 5.25 A
D. None of above
40. The current in low voltage winding of a 20 kVA, 2200/220 V, 50 Hz, 3-phase A-A transformer, at
full load is:
B 30,30 A
D None of above
A. 52.48 A
С. 26.24 A
O00 SPARK 4
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