4.32 Consider a 75 kVA, 2400/240 V, 60 Hz transformer. Assume that the open-circuit and short- circuit tests were performed on the transformer and that the following data were obtained: Open-Circuit Test (on Primary) Short-Circuit Test (on Primary) Voltmeter Va=2400V V= 200 V I=0.50 A P =75W Ammeter =31.25 A Wattmeter P = 800 W Also assume that the transformer operated at full load with a 0.92 lagging power factor. Note that the given power factor belongs to the load, not to the transformer. Determine the following: (a) The equivalent impedance, resistance, and reactance of the transformer, all referred to its primary side (b) Total loss, including the copper and core losses, at full load (c) The efficiency of the transformer (d) The percent voltage regulation of the transformer

4.32 Consider a 75 kVA, 2400/240 V, 60 Hz transformer. Assume that the open-circuit and short- circuit tests were performed on the transformer and that the following data were obtained: Open-Circuit Test (on Primary) Short-Circuit Test (on Primary) Voltmeter Va=2400V V= 200 V I=0.50 A P =75W Ammeter =31.25 A Wattmeter P = 800 W Also assume that the transformer operated at full load with a 0.92 lagging power factor. Note that the given power factor belongs to the load, not to the transformer. Determine the following: (a) The equivalent impedance, resistance, and reactance of the transformer, all referred to its primary side (b) Total loss, including the copper and core losses, at full load (c) The efficiency of the transformer (d) The percent voltage regulation of the transformer

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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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

4.32 Consider a 75 kVA, 2400/240 V, 60 Hz transformer. Assume that the open-circuit and short-
circuit tests were performed on the transformer and that the following data were obtained:
Open-Circuit
Test (on Primary)
Short-Circuit Test
(on Primary)
Voltmeter
Var=2400V
V= 200 V
I=0.50 A
P =75W
Ammeter
=31.25 A
Wattmeter
P = 800 W
Also assume that the transformer operated at full load with a 0.92 lagging power factor. Note
that the given power factor belongs to the load, not to the transformer. Determine the following:
(a) The equivalent impedance, resistance, and reactance of the transformer, all referred to its
primary side
(b) Total loss, including the copper and core losses, at full load
(c) The efficiency of the transformer
(d) The percent voltage regulation of the transformer

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Which of the following is the correct equation for calculating the rated current for a single-phase transformer? A. I=va/e b.I=sc/e c.a/e d.e×z/e
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