DESIGN AND CONSTRUCTION OF 25AMPS SINGLE PHASE AUTOMATIC CHANGE OVER

By

NWALUA CHUKWUKEREZE EE/H2003/119

Presented To

Department of Electrical/Electronic Engineering

96 Pages 11,642 Words 105 Views Microsoft Word Format No. of Chapters: 1 to 7 Chapters

Reference/Bibliography: YES 4,000 NGN PROJECT

ABSTRACT

The design of this project is such that a combination of comparators digitals switches (logic IC), electronics timers and electromagnetic switches are used to achieve a very fast and effective change over in this case. This project was entirely constructed and the thesis written by Nwalua Chukwukereze under the supervision of Engr. Ihedioha in partial fulfillment of the requirements for the award of Higher National Diploma in Electrical Electronics Engineering.

The automatic change over switch makes use of protective relays and contractors among other things which constantly monitor the power system to ensure maximum continuity of the electrical service with minimum damage to life and property. They are found mostly in domestic installations, hospital threatres, conference halls, computer centres, data and research centres, laboratories and industries that require three phase constant power supply. This equipment however is used to protect some house holds appliances from electrical faults which may arise due to voltage drop. It was designed and constructed purposely to alleviate the suffering encountered by the consumers following supply authorityâ€™s consistent failure to meet its obligations of constant and uninterrupted power supply.

TABLE OF CONTENT

Title page

Approval page

Dedication

Acknowledgement

Abstract

Table of content

CHAPTER ONE

1.0 Introduction

1.1 General Description and application

1.2 Block Diagram representation

CHAPTER TWO

2.0 Theory Of Operation

2.1 The General Starter

2.2 The Change Over Switch

2.3 The General Turn Off Switch

2.4 The Power Supply

CHAPTER THREE

COMPONENT DESCRIPTION AND RATING

THE COMPONENT USED FOR THE PROJECT ARE LISTED

3.0 Definition And Analysis Of Component And Ratings

3.1 The Component Used For The Project

3.2 Power Transformers

3.3 Relays

3.4 Contactors

3.5 Battery

3.6 Switch

3.7 Capacitors

3.8 Capacitor Ics

3.9 Logics Ics

3.10 Timer

3.11 Diodes

3.12 Indicator lamps

3.13 Circuit breaker

3.14 Wires jumpers and connectors

3.15 Transistors

3.16 Resistors

CHAPTER FOUR

4.0 Circuit Analysis

4.1 The Voltage Converters

4.2 The Comparators

4.3 The Logic Gates

4.4 The Generator Starter

4.5 The Change Over Switch

CHAPTER FIVE

CONSTRUCTION AND ECONOMIC OF THE PROJECT

5.0 Construction Of The Casing

5.1 Economic Of The Project

5.2 Reliability

5.3 Maintainability

5.4 Project Evaluation

CHAPTER SIX

6.0 Testing

6.1 Trouble Shooting And Remedy

CHAPTER SEVEN

CONCLUSION

REFERENCES

96 Pages 11,642 Words 105 Views Microsoft Word Format No. of Chapters: 1 to 7 Chapters

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