A Single-phase transformer rated 1000-VA, 240/120 Volts has been tested to determine its equivalent circuit. The results of the tests are: Voltage - Volts Current-Amps Power - Watts Open Circuit Test 120 1.9 82 Short Circuit Test 22 4.2 20.8 a) Find the equivalent circuit of the transformer b) Find the transformer's voltage regulation at rated conditions and (1000 VA and 240 Volts at the high-voltage side terminals): i) 0.8 pf lagging, ii) 1.0 pf and iii) 0.8 pf leading. Determine the percentage of efficiency at 50% of load, pf=0.8 lagging and 240 Volts terminal voltage. c)

A Single-phase transformer rated 1000-VA, 240/120 Volts has been tested to determine its equivalent circuit. The results of the tests are: Voltage - Volts Current-Amps Power - Watts Open Circuit Test 120 1.9 82 Short Circuit Test 22 4.2 20.8 a) Find the equivalent circuit of the transformer b) Find the transformer's voltage regulation at rated conditions and (1000 VA and 240 Volts at the high-voltage side terminals): i) 0.8 pf lagging, ii) 1.0 pf and iii) 0.8 pf leading. Determine the percentage of efficiency at 50% of load, pf=0.8 lagging and 240 Volts terminal voltage. c)

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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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

A Single-phase transformer rated 1000-VA, 240/120 Volts has been tested to determine its equivalent
circuit. The results of the tests are:
Voltage - Volts
Current-Amps
Power - Watts
Open Circuit Test
120
1.9
82
Short Circuit Test
22
4.2
20.8
a) Find the equivalent circuit of the transformer
b) Find the transformer's voltage regulation at rated conditions and (1000 VA and 240 Volts at the
high-voltage side terminals): i) 0.8 pf lagging, ii) 1.0 pf and iii) 0.8 pf leading.
Determine the percentage of efficiency at 50% of load, pf=0.8 lagging and 240 Volts terminal
voltage.
c)

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Step 2: (a) Sketch the equalent circuit.

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Step 3: (b) Find the voltage regulations.

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Step 4: (c) Find the percentage of efficiency.

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