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Example 2-5. A 15-kVA, 2300/230-V transformer is to be tested to determine its excitation branch components, its series impedances, and its voltage regulation. The fol- lowing test data have been taken from the primary side of the transformer: Open-circuit test Short-circuit test Voc = 2300 V Vsc = 47 V Loc = 0.21 A Isc = 6.0 A Poc = 50 W Psc=160 W The data have been taken by using the connections shown in Figures 2-19 and 2-20. (a) Find the equivalent circuit of this transformer referred to the high-voltage side. (b) Find the equivalent circuit of this transformer referred to the low-voltage side. (c) Calculate the full-load voltage regulation at 0.8 lagging power factor, 1.0 power factor, and at 0.8 leading power factor. (d) Plot the voltage regulation as load is increased from no load to full load at power factors of 0.8 lagging, 1.0, and 0.8 leading. (e) What is the efficiency of the transformer at full load with a power factor of 0.8 lagging?

Example 2-5. A 15-kVA, 2300/230-V transformer is to be tested to determine its excitation branch components, its series impedances, and its voltage regulation. The fol- lowing test data have been taken from the primary side of the transformer: Open-circuit test Short-circuit test Voc = 2300 V Vsc = 47 V Loc = 0.21 A Isc = 6.0 A Poc = 50 W Psc=160 W The data have been taken by using the connections shown in Figures 2-19 and 2-20. (a) Find the equivalent circuit of this transformer referred to the high-voltage side. (b) Find the equivalent circuit of this transformer referred to the low-voltage side. (c) Calculate the full-load voltage regulation at 0.8 lagging power factor, 1.0 power factor, and at 0.8 leading power factor. (d) Plot the voltage regulation as load is increased from no load to full load at power factors of 0.8 lagging, 1.0, and 0.8 leading. (e) What is the efficiency of the transformer at full load with a power factor of 0.8 lagging?

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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Example 2-5. A 15-kVA, 2300/230-V transformer is to be tested to determine its excitation branch components, its series impedances, and its voltage regulation. The fol- lowing test data have been taken from the primary side of the transformer: Open-circuit test Short-circuit test Voc = 2300 V Vsc = 47 V Loc = 0.21 A Isc = 6.0 A Poc = 50 W Psc=160 W The data have been taken by using the connections shown in Figures 2-19 and 2-20. (a) Find the equivalent circuit of this transformer referred to the high-voltage side. (b) Find the equivalent circuit of this transformer referred to the low-voltage side. (c) Calculate the full-load voltage regulation at 0.8 lagging power factor, 1.0 power factor, and at 0.8 leading power factor. (d) Plot the voltage regulation as load is increased from no load to full load at power factors of 0.8 lagging, 1.0, and 0.8 leading. (e) What is the efficiency of the transformer at full load with a power factor of 0.8 lagging?
Transcribed Image Text:Example 2-5. A 15-kVA, 2300/230-V transformer is to be tested to determine its excitation branch components, its series impedances, and its voltage regulation. The fol- lowing test data have been taken from the primary side of the transformer: Open-circuit test Short-circuit test Voc = 2300 V Vsc = 47 V Loc = 0.21 A Isc = 6.0 A Poc = 50 W Psc=160 W The data have been taken by using the connections shown in Figures 2-19 and 2-20. (a) Find the equivalent circuit of this transformer referred to the high-voltage side. (b) Find the equivalent circuit of this transformer referred to the low-voltage side. (c) Calculate the full-load voltage regulation at 0.8 lagging power factor, 1.0 power factor, and at 0.8 leading power factor. (d) Plot the voltage regulation as load is increased from no load to full load at power factors of 0.8 lagging, 1.0, and 0.8 leading. (e) What is the efficiency of the transformer at full load with a power factor of 0.8 lagging?
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