4. A 500 Kva, 3-phase 50HZ transformer has a voltage ratio (line voltages) of 33/11 Kv and is Delta/Star connected. The resistance per phase are : high voltage 35 ohms, low voltage ,0.876 ohm and the iron loss is 3050 W. Calculate the value of efficiency at full- load and one-half of full load respectively (a) @ unity pf (b) @0.8 pf
4. A 500 Kva, 3-phase 50HZ transformer has a voltage ratio (line voltages) of 33/11 Kv and is Delta/Star connected. The resistance per phase are : high voltage 35 ohms, low voltage ,0.876 ohm and the iron loss is 3050 W. Calculate the value of efficiency at full- load and one-half of full load respectively (a) @ unity pf (b) @0.8 pf
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 3.26P: A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a...
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