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5. A 50-kVA 20,000/480-V 60-Hz single-phase distribution transformer is tested with the following results: Open-circuit test (measured from secondary side) Voc 480 V Ioc = 4.1 A Poc 620 W Short-circuit test (measured from primary side) Vsc=1130 V Isc = 1.30 A Psc=550 W a) Find the per-unit equivalent circuit for this transformer at 60 Hz. b) What is the efficiency of the transformer at rated conditions and unity power factor? What is the voltage regulation at those conditions? c) What would the ratings of this transformer be if it were operated on a 50-Hz power system? d) Sketch the equivalent circuit of this transformer referred to the primary side if it is operating at 50 Hz. e) What is the efficiency of the transformer at rated conditions on a 50 Hz power system, with unity power factor? What is the voltage regulation at those conditions? f) How does the efficiency of a transformer at rated conditions and 60 Hz compare to the same physical device running a 50 Hz?

5. A 50-kVA 20,000/480-V 60-Hz single-phase distribution transformer is tested with the following results: Open-circuit test (measured from secondary side) Voc 480 V Ioc = 4.1 A Poc 620 W Short-circuit test (measured from primary side) Vsc=1130 V Isc = 1.30 A Psc=550 W a) Find the per-unit equivalent circuit for this transformer at 60 Hz. b) What is the efficiency of the transformer at rated conditions and unity power factor? What is the voltage regulation at those conditions? c) What would the ratings of this transformer be if it were operated on a 50-Hz power system? d) Sketch the equivalent circuit of this transformer referred to the primary side if it is operating at 50 Hz. e) What is the efficiency of the transformer at rated conditions on a 50 Hz power system, with unity power factor? What is the voltage regulation at those conditions? f) How does the efficiency of a transformer at rated conditions and 60 Hz compare to the same physical device running a 50 Hz?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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5. A 50-kVA 20,000/480-V 60-Hz single-phase distribution transformer is tested with the following results: Open-circuit test (measured from secondary side) Voc 480 V Ioc = 4.1 A Poc 620 W Short-circuit test (measured from primary side) Vsc=1130 V Isc = 1.30 A Psc=550 W a) Find the per-unit equivalent circuit for this transformer at 60 Hz. b) What is the efficiency of the transformer at rated conditions and unity power factor? What is the voltage regulation at those conditions? c) What would the ratings of this transformer be if it were operated on a 50-Hz power system? d) Sketch the equivalent circuit of this transformer referred to the primary side if it is operating at 50 Hz. e) What is the efficiency of the transformer at rated conditions on a 50 Hz power system, with unity power factor? What is the voltage regulation at those conditions? f) How does the efficiency of a transformer at rated conditions and 60 Hz compare to the same physical device running a 50 Hz?
Transcribed Image Text:5. A 50-kVA 20,000/480-V 60-Hz single-phase distribution transformer is tested with the following results: Open-circuit test (measured from secondary side) Voc 480 V Ioc = 4.1 A Poc 620 W Short-circuit test (measured from primary side) Vsc=1130 V Isc = 1.30 A Psc=550 W a) Find the per-unit equivalent circuit for this transformer at 60 Hz. b) What is the efficiency of the transformer at rated conditions and unity power factor? What is the voltage regulation at those conditions? c) What would the ratings of this transformer be if it were operated on a 50-Hz power system? d) Sketch the equivalent circuit of this transformer referred to the primary side if it is operating at 50 Hz. e) What is the efficiency of the transformer at rated conditions on a 50 Hz power system, with unity power factor? What is the voltage regulation at those conditions? f) How does the efficiency of a transformer at rated conditions and 60 Hz compare to the same physical device running a 50 Hz?
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