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:

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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.
A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters:
18 N, X,
4.14.
250 m2, ReH
15 kn, and
= 180 mn, X2
25 kN. If the open-circuit and short-circuit tests are performed on
25 N, R2
%3D
R1
XmH
this 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 the
transformer at unity power factor? What is the efficiency at full load and
unity power factor?
%3D
%3D
%3D
4.15.
Transcribed Image Text: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. A 25-kVA, 4000/400-V, 60-Hz transformer has the following parameters: 18 N, X, 4.14. 250 m2, ReH 15 kn, and = 180 mn, X2 25 kN. If the open-circuit and short-circuit tests are performed on 25 N, R2 %3D R1 XmH this 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 the transformer at unity power factor? What is the efficiency at full load and unity power factor? %3D %3D %3D 4.15.
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