Question 2 Open-circuit and short-circuit tests on a 40-KVA, 2400/240-V, 50 Hz transformer gave the following results: Open-circuit test (with measurements done on the LV side): 240 V, 2.7 A, 125 W Short-circuit test (with measurements done on the HV side): 48 V, 16.6667 A, 610 W Record these values as you might need them in your subsequent calculations. a) Determine the parameters of the approximate equivalent circuit of the transformer referred to the HV side from the given test results. i. Enter R. (in kOhms): ii. Enter X (in kOhms): iii. Enter R.1 (in Ohms): iv. Enter X-1 (in Ohms): | (correct to 4 decimal places) (correct to 4 decimal places) (correct to 4 decimal places) (correct to 4 decimal places) b) Using the approximate equivalent circuit of the transformer referred to the HV side, determine the voltage regulation VR of the transformer operating at full load with the rated output voltage, 0.85 power factor lagging. Enter VR (in %): Please scroll to the bottom of page for END of question. (correct to 4 decimal places) c) Using the test results only (i.e., not using the approximate equivalent circuit of the transformer), determine the efficiency of the transformer operating at 90% of full load with the rated output voltage, 0.85 power factor lagging. Enter n (in %): (correct to 4 decimal places)
Question 2 Open-circuit and short-circuit tests on a 40-KVA, 2400/240-V, 50 Hz transformer gave the following results: Open-circuit test (with measurements done on the LV side): 240 V, 2.7 A, 125 W Short-circuit test (with measurements done on the HV side): 48 V, 16.6667 A, 610 W Record these values as you might need them in your subsequent calculations. a) Determine the parameters of the approximate equivalent circuit of the transformer referred to the HV side from the given test results. i. Enter R. (in kOhms): ii. Enter X (in kOhms): iii. Enter R.1 (in Ohms): iv. Enter X-1 (in Ohms): | (correct to 4 decimal places) (correct to 4 decimal places) (correct to 4 decimal places) (correct to 4 decimal places) b) Using the approximate equivalent circuit of the transformer referred to the HV side, determine the voltage regulation VR of the transformer operating at full load with the rated output voltage, 0.85 power factor lagging. Enter VR (in %): Please scroll to the bottom of page for END of question. (correct to 4 decimal places) c) Using the test results only (i.e., not using the approximate equivalent circuit of the transformer), determine the efficiency of the transformer operating at 90% of full load with the rated output voltage, 0.85 power factor lagging. Enter n (in %): (correct to 4 decimal places)
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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Transcribed Image Text:Question 2
Open-circuit and short-circuit tests on a 40-KVA, 2400/240-V, 50 Hz transformer gave the following results:
Open-circuit test (with measurements done on the LV side): 240 V, 2.7 A, 125 W
Short-circuit test (with measurements done on the HV side): 48 V, 16.6667 A, 610 W
Record these values as you might need them in your subsequent calculations.
a)
Determine the parameters of the approximate equivalent circuit of the transformer referred to the HV side
from the given test results.
i. Enter R. (in kOhms):
ii. Enter X (in kOhms):
iii. Enter R.1 (in Ohms):
iv. Enter X1 (in Ohms):
(correct to 4 decimal places)
(correct to 4 decimal places)
(correct to 4 decimal places)
(correct to 4 decimal places)
b)
Using the approximate equivalent circuit of the transformer referred to the HV side, determine the voltage
regulation VR of the transformer operating at full load with the rated output voltage, 0.85 power factor
lagging.
Enter VR (in %):
(correct to 4 decimal places)
Please scroll to the bottom of page for END of question.
C)
Using the test results only (i.e., not using the approximate equivalent circuit of the transformer), determine
the efficiency n of the transformer operating at 90% of full load with the rated output voltage, 0.85 power
factor lagging.
Enter n (in %):
(correct to 4 decimal places)
d)
Using the test results only, determine the KVA load at maximum efficiency.
Enter KVAmax (in kVA):
(correct to 4 decimal places)
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