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?
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 3.16P: A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters:...
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