CONSTRUCTION OF AUTOMATIC PHASE CHANGER

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CONSTRUCTION OF AUTOMATIC PHASE CHANGER

TABLE OF CONTENT

Cover page

Dedication

Certification

Acknowledgement

Table of content

CHAPTER ONE

1.1       Introduction

1.2       Block diagram of an automatic phase changer

1.3       Component list

CHAPTER TWO-Component description

2.1    comparator

2.2    Zener diode p.n junction,electron,avalanche diode,avalanche breakdown}

2.3    Rectifier

2.4    Relay

2.5    Transformer

2.6    Capacitor

2.7    Fuse

CHAPTER THREE

3.1   Comparator/voltage sensor stag.

3.2   Design calculator

3.3   Oscillator circuit

3.4   Flip flop/switching Transistor stage

3.5   Logic circuit

3.6   Transistor switching circuit

3.7   Relay switching circuit

3.8   Output load terminal

3.9   Methodology

CHAPTER FOUR

4.1Working

4.2Performance evaluation

4.3Circuit diagram

4.4Planning of                    

CHAPTER ONE

Raw power instability in developing countries creates a need for automation of electrical power generation or alternative sources of power to back up the utility supply. This automation is required as the rate of power outage becomes predominantly high. Most industrial and commercial processes are dependent on power  supply and if it processes of change-over are manual, serious time is not only wasted but also creates devices or machine damages from human error during the change-over connections,which could bring massive losses.The starting of the generator is done by a relay which switches the battery voltage to ignition coil of the generator while the main power relay switches the load to either public supply or generator.Fig 1 shows the generalized block diagram of the system.The approach used in this work  is the moduler  approach where the overall design was first broken into functional block diagrams,where each block in the diagram represents a section of the circuit that carries out a specific function.The functional block diagram fig 1 also shows the interconnection between these blocks.Each section of the block is analyzed below.A manual change-over switch consists of  a manual change over switch box,switch gear box and cut out fuse or the connected fuse as describe by the by rocks and Mazur{1993}.This change-over switch box separate the sources between the generator and public supply when there is power supply outage from public supply,someone has t go and change the line to the generator. Thus when the power supply is restored, someone has to put off the generator and then change the source line from generator to public supply. In view of the above manual change-over switch system that involves manpower in starting the generator and switching over from public supply to generator and vice-versa when the supply is restored.

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