In no-load mode a single phase two windings power transformer draws apparent power S10=100VA at power factor of cos@10=0.4. At a certain load, this machine absorbs apparent power of S,-350VA at power factor coso,-0.8. In this mode, transformer operates with total amount of its copper power losses of 4pcur+4pcuz=30W. Find: a) The amount of the iron power losses at this load - 4pIr =? b) Transformer efficiency at this load -n=?
In no-load mode a single phase two windings power transformer draws apparent power S10=100VA at power factor of cos@10=0.4. At a certain load, this machine absorbs apparent power of S,-350VA at power factor coso,-0.8. In this mode, transformer operates with total amount of its copper power losses of 4pcur+4pcuz=30W. Find: a) The amount of the iron power losses at this load - 4pIr =? b) Transformer efficiency at this load -n=?
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 3.31MCQ
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