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DESIGN AND
CONSTRUCTION OF AN AUTOMATIC THREE PHASE SELECTOR.
ABSTRACT
This is a technical report presented on
the design and construction of an Automatic Three Phase Selector.
In the construction work, an ordinary level knowledge of electronics principles
are observed. We aimed at presenting a practical aspect of the subject and then
providing the argument necessary for a thorough understanding. The reliability
of the specimen was estimated after construction and testing to ensure steady
state stability. The work is organized into five chapters.
Chapter one introduced the subject matter. Chapter two explores the literature
review of the related works. Chapter three contains a detailed account of the
design work while chapter four closely attempted an analysis of the design
work. Chapter five draws the curtain by concluding the work.
TABLE OF CONTENT
CHAPTER ONE
1.0
Introduction
1.1
Aims/Objectives of the project
1.2
Significance of the study
1.3
Methodology
CHAPTER TWO
2.1 A review of Automatic Phase
Selector
2.2 Power Supply Unit
2.3 The Transformer
2.4 The Rectifier
2.5 The Filter
2.6 The Voltage Regulator
2.7 Power Circuit
2.8 The Relays
CHAPTER THREE
3.0 The Design Proper
3.1 The Power Supply
3.2 The Step down Block
3.3 The Rectifier Block
3.4 The smoothening Block
3.5 The Regulator
3.6 The Current Sink
CHAPTER FOUR
4.0
Design Analysis
4.1
The Rectifier Circuit
4.2
The Filter Circuit
4.3
Design Calculation
4.4
The DC Voltage Regulator
4.5
The Voltage Programmable Voltage Sink
CHAPTER FIVE
5.0
Discussion of Result
5.1
Conclusion
5.2
Recommendation
References
CHAPTER
ONE
INTRODUCTION
As the growing
population of human race widens the gulf between energy supply and energy
demand, the imbalance in energy availability sent researchers into excavating
for a way of settling this age long squabble. A lasting solution is vested on
alternative use of the renewable energy source, a project that is yet to be
widely applied. Hence, the continuation of the unsettled yearn for sufficient
power. Consequently, the power lines are frequently over loaded resulting to a
trip of power by the action of switch gears or by the load shading process
undertaken by the distribution authorities.
Since it is crystal clear that some institutions such as health related
institutions and some other delicate systems should not be allowed to suffer
equally with their counterparts, Automatic Phase Selector is used to sustain
energy consumption in the time of phase trip. The design of this circuit
involves the use of automatic switches but the details of design varies from
place to place, time to time and also depends on the type of load involved.
This project involves the use of transistor driven relays to affect the change
of phase whenever the voltage condition becomes intolerable in the previous
phase connected.
1.1
AIMS/OBJECTIVES OF THE PROJECT
The analysis of this
project cannot go without enumerating the goals meant to be achieved in the
pursuit of the work. These objectives include:-
i.
To develop a simple low cost device aimed at easing the prevalent burden faced
by delicate offices, parastatals and institutions who need very low but
constant power supply. Since supply is always on along the distribution lines
that supply such sites, what pesters on the progress of work thereof is always
the unwarranted trip of phases due to power usage from neighbouring consumers.
The automatic phase selector therefore, erase this setback form the face of
progress of work in such offices.
ii.
To stimulate the interest of upcoming students to take up research not only in
their field of study “Electrical/Electronics Engineering” but also to extend
their arms to other disciplines, thus enhancing the versatility of
Electrical/Electronics Engineering.
iii.
To create awareness that will stimulate the interest of fellow students who
intend to take up research topic on automatic switch of any type.
Emphatically, the
purpose of this project is to build an automatic switch system which is capable
of selecting a phase with best operating voltage for delicate offices.
1.2
SIGNIFICANCE OF STUDY
The significance of this project work
cannot be overemphasized. This is because the number of lives that has being
lost to the hand of interruption of power in health institutions and the like
is not negligible. Delicate appliances have become the main victim of this
artificial circumstance. The applicability of the outcome of this research work
in several facets of human endeavour makes this work of real importance to
humanity.
The use of the device produced from this research work would help to reduce
human labour and hazard, going by the fact that many have been handicapped by
electric shock because of the attempt they made to select another phase, and
that the handicapped are helpless and cannot change phases.
1.3
METHODOLOGY
The designing of this circuit was
accomplished by a constant and detailed study of the c constituent components.
This involved the study of their characteristics in isolation, and when
connected together with some other components. A rough design was always made
with some theoretical backup. Those designs were implemented and tested using
project boards.
The internet was visited for circuit ideas where problems were encountered and
the necessary adjustments made on paper and then effected on the projects
board.
Each block that works was transferred to the Vero board where it was finally
soldered in position. Library materials were consulted as well.
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