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
Related questions
Question
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 6 steps with 6 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Power System Analysis and Design (MindTap Course …
Electrical Engineering
ISBN:
9781305632134
Author:
J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:
Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Power System Analysis and Design (MindTap Course …
Electrical Engineering
ISBN:
9781305632134
Author:
J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:
Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning