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b) A 300KVA, 3-phase, 50Hz transformer has a voltage ratio (line voltages) of 22/11KV and is delta/star connected. The resistances per phase for high voltage winding are 30 2 and 1 2 for low voltage windings. If the iron loss is 2Kw, calculate i. the equivalent resistance per phase referred to secondary full load copper losses ii. 111. the efficiency at full load 0.8 power factor.

b) A 300KVA, 3-phase, 50Hz transformer has a voltage ratio (line voltages) of 22/11KV and is delta/star connected. The resistances per phase for high voltage winding are 30 2 and 1 2 for low voltage windings. If the iron loss is 2Kw, calculate i. the equivalent resistance per phase referred to secondary full load copper losses ii. 111. the efficiency at full load 0.8 power factor.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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b) A 300KVA, 3-phase, 50Hz transformer has a voltage ratio (line voltages) of 22/11KV and is delta/star connected. The resistances per phase for high voltage winding are 30 2 and 1 2 for low voltage windings. If the iron loss is 2Kw, calculate i. the equivalent resistance per phase referred to secondary full load copper losses ii. 111. the efficiency at full load 0.8 power factor.
Transcribed Image Text:b) A 300KVA, 3-phase, 50Hz transformer has a voltage ratio (line voltages) of 22/11KV and is delta/star connected. The resistances per phase for high voltage winding are 30 2 and 1 2 for low voltage windings. If the iron loss is 2Kw, calculate i. the equivalent resistance per phase referred to secondary full load copper losses ii. 111. the efficiency at full load 0.8 power factor.
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