5- Find the efficiency of a 150KVA transformer at 25%, 33% and 100% full load at: a/ unity power factor b/ 0.8 lagging P.F. if the copper loss is 1600W at full load and the iron loss is 1400W. ignore the effect of temperature rise and magnetizing current. [a/ 96.150, 96.940, 98.04%; b/ 95.230, 96.210, 97.560%]

5- Find the efficiency of a 150KVA transformer at 25%, 33% and 100% full load at: a/ unity power factor b/ 0.8 lagging P.F. if the copper loss is 1600W at full load and the iron loss is 1400W. ignore the effect of temperature rise and magnetizing current. [a/ 96.150, 96.940, 98.04%; b/ 95.230, 96.210, 97.560%]

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 3.63P: A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a...

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