A 24-kVA, 120/480-V, step-up transformer performs at its maximum efficiency at 75% of its rated load with a unity power factor. The core loss is 1.2 kW. What is the equivalent winding resistance as referred to the primary side? Answer = (53.3 mΩ) What is the efficiency of the transformer if it delivers the rated load at a power factor of 0.9 lagging? Answer = (86.6%)
A 24-kVA, 120/480-V, step-up transformer performs at its maximum efficiency at 75% of its rated load with a unity power factor. The core loss is 1.2 kW. What is the equivalent winding resistance as referred to the primary side? Answer = (53.3 mΩ) What is the efficiency of the transformer if it delivers the rated load at a power factor of 0.9 lagging? Answer = (86.6%)
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 3.11P: For the transformer in Problem 3.10. The open-circuit test with 11.5 kV applied results in a power...
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A 24-kVA, 120/480-V, step-up transformer
performs at its maximum efficiency at 75% of
its rated load with a unity power factor. The
core loss is 1.2 kW.
What is the equivalent winding resistance as
referred to the primary side? Answer = (53.3 mΩ)
What is the efficiency of the transformer if it
delivers the rated load at a power factor of
0.9 lagging? Answer = (86.6%)
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