The effective primary and secondary resistances of a 500 kVA, 12000/2400 volt 60 cycle transformer are 1.52 and 0.049 ohms, and the corresponding leakage reactances are 6.4 and 0.26 ohms. The no-load core loss is 1700 Watts. Determine the efficiency at rated kVA load and unity pf. a. 98.72% b. 94. 23% c. 97.43% d. 96.22%

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 3.53P: The ratings of a three-phase, three-winding transformer are Primary: Y connected, 66kV,15MVA...
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64. The effective primary and secondary resistances of a 500 kVA, 12000/2400 volt 60 cycle transformer are 1.52 and 0.049 ohms, and the corresponding leakage reactances are 6.4 and 0.26 ohms. The no-load core loss is 1700 Watts. Determine the efficiency at rated kVA load and unity pf. a. 98.72% b. 94. 23% c. 97.43% d. 96.22%
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