Practice Problem 1.3 A 100 kVA transformer 7,621/230 - Volt has primary and secondary resistances of 1.25 and 0.01 Ohms respectively. The primary and secondary reactances are 8.75 and 0.05 ohms. Neglecting no - load current and losses, solve for the approximate circuit: (a) percent voltage regulation at 0.707 power factor lagging using primary as reference; (b) secondary as reference. Ansuers: (a) Referred to primary circuit: V N = 8,338.721/3.279° V (b) Referred to secondary circuit: V s = 251.661/3.279° V % V.R. = 9.418% % V.R. = 9.418%

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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Direction. Answer each problem and show your solutions cleanly and clearly. Draw circuit diagrams.

Practice Problem 1.3
A 100 kVA transformer 7,621/230 - Volt has primary and secondary resistances of 1.25 and
0.01 Ohms respectively. The primary and secondary reactances are 8.75 and 0.05 ohms.
Neglecting no - load current and losses, solve for the approximate circuit: (a) percent voltage
regulation at 0.707 power factor lagging using primary as reference; (b) secondary as reference.
Answers:
(a) Referred to primary circuit:
V NI = 8,338.721/3.279* V
(b) Referred to secondary circuit:
V NI = 251.661/3.279° V
% V.R. = 9.418%
% V.R. = 9.418%
Transcribed Image Text:Practice Problem 1.3 A 100 kVA transformer 7,621/230 - Volt has primary and secondary resistances of 1.25 and 0.01 Ohms respectively. The primary and secondary reactances are 8.75 and 0.05 ohms. Neglecting no - load current and losses, solve for the approximate circuit: (a) percent voltage regulation at 0.707 power factor lagging using primary as reference; (b) secondary as reference. Answers: (a) Referred to primary circuit: V NI = 8,338.721/3.279* V (b) Referred to secondary circuit: V NI = 251.661/3.279° V % V.R. = 9.418% % V.R. = 9.418%
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