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 authority’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
