3. A 3-phase, 50 Hz transformer has a Delta connected primary and a star- connected secondary,the line voltage being 22,000V and 400V respectively. The secondary has a Star connected balanced load at 0.8 power factor lagging.The line current on the primary side is 5 A. Determine the current in each coil of the primary and in each secondary line. What is the output of the transformer in Kw?

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 3.9P
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3. A 3-phase, 50 Hz transformer has a Delta connected primary and a star-
connected secondary,the line voltage being 22,000V and 400V respectively. The
secondary has a Star connected balanced load at 0.8 power factor lagging.The line
current on the primary side is 5 A. Determine the current in each coil of the
primary and in each secondary line. What is the output of the transformer in Kw?
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
Transcribed Image Text:3. A 3-phase, 50 Hz transformer has a Delta connected primary and a star- connected secondary,the line voltage being 22,000V and 400V respectively. The secondary has a Star connected balanced load at 0.8 power factor lagging.The line current on the primary side is 5 A. Determine the current in each coil of the primary and in each secondary line. What is the output of the transformer in Kw? 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
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