4.27 A 10-kVA, 4160/240-V, single-phase transformer has a per-unit resistance of 0.01 and a per-unit reactance of 0.05. It has a core loss at rated voltage of 150 W. The transformer supplies 7.5 kVA at 240 V and 0.6 power factor lagging to a load connected to its secondary terminals. a. Determine the equivalent impedance in ohms referred to the primary side. b. Find the input voltage. c. Determine the efficiency of the transformer.

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 3.14P: A single-phase 50-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down...
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4.27 A 10-KVA, 4160/240-V, single-phase transformer has a per-unit resistance of
0.01 and a per-unit reactance of 0.05. It has a core loss at rated voltage of 150 W.
The transformer supplies 7.5 KVA at 240 V and 0.6 power factor lagging to a load
connected to its secondary terminals.
a. Determine the equivalent impedance in ohms referred to the primary side.
b. Find the input voltage.
c. Determine the efficiency of the transformer.
Transcribed Image Text:4.27 A 10-KVA, 4160/240-V, single-phase transformer has a per-unit resistance of 0.01 and a per-unit reactance of 0.05. It has a core loss at rated voltage of 150 W. The transformer supplies 7.5 KVA at 240 V and 0.6 power factor lagging to a load connected to its secondary terminals. a. Determine the equivalent impedance in ohms referred to the primary side. b. Find the input voltage. c. Determine the efficiency of the transformer.
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