DESIGN AND CONSTRUCTION OF A SINGLE PHASE AUTOMATIC CHANGE OVER SWITCH WITH PHASE SELECTOR
By
NDUBUISI OBINNA F. EE/H2003/004
Presented To
Department of Electrical/Electronic Engineering
ABSTRACT
Change over switch is a device used to switch off a power supply and subsequently switch on another power source. Basically it is aimed at switching on a more convenient power supply to the load. Since it switches on power to the load precaution has to be taken while choosing the type of change over switch. Also size, arcing control are put into consideration in the choice.
Due to inconsistent supply of power, there is a growing need for an alternative source of power supply. This has led to heavy capital investment in a bid to curb power failure and ensure regular power supply for our industries, hospitals and homes. The problem of power failure can be checkmated with the use of standby generating set.
An Engineering author Tony Rudk Inn said in his book titled "Upgraded signal source with improved performance and reliability" that the cost and depreciation associated with breakdown vary from one application to the other, and in some cases, the user has little choice but to ensure that a stand-by unit is available to take over on event of failure of primary system.
If some of these big firms do not make provisions for stand-by power source, frustration could set in which may lead to the closure of business and thus throwing workers into unemployment. Also in the case of hospitals undergoing a surgical operation and the power supply suddenly goes off, the patient might loose his life due to power outage.
Furthermore, if the President of the country is making a nation wide broadcast and all of a sudden there is power failure in the transmitting station, it would be viewed as an attempt to sabotage the government ruling and some people must go for it.
Sequel to the rate at which more sophisticated electrical/electronics gadgets are being procured an installed in our homes, hospital and business premises, there is a justifiable need for a faster and more reliable change over system in an event of power outage.
TABLE OF CONTENTS
Title page
Approval page
Certification
Dedication
Acknowledgement
Table of content
CHAPTER ONE
Introduction
Aims and Objective
Scope and limitation
CHAPTER TWO
Literature Review
System Operation of the Automatic Power
The Stand by Power Unit
Requirement for a Generator to be used on Change Over Switch
CHAPTER THREE
Component and Description
Contactors
Contactors Mode of Operation
Circuit Breaker
CHAPTER FOUR
Circuit diagram and Operation
The NEPA Supply Unit
The Phase Selector Unit
The Generator Unit
Circuit Operation
Sequence of Operation
Testing and Result
Packaging
CHAPTER FIVE
Observation Summary and Conclusion
Observation
Summary
Suggestion
Conclusion
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