Download complete project materials on Construction Of Automatic Phase Changer from chapter one to five
TABLE OF CONTENT
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Cover page
Dedication
Certification
Acknowledgement
Table of content
CHAPTER ONE
Introduction
Block diagram of an automatic phase changer
Component list
CHAPTER TWO-Component description
comparator
Zener diode p.n junction,electron,avalanche diode,avalanche breakdown}
Rectifier
Relay
Transformer
Capacitor
Fuse
CHAPTER THREE
Comparator/voltage sensor stag.
Design calculator
Oscillator circuit
Flip flop/switching Transistor stage
Logic circuit
Transistor switching circuit
Relay switching circuit
Output load terminal
Methodology
CHAPTER FOUR
Working
Performance evaluation
Circuit diagram
Planning of work
Application
CHAPTER FIVE
CONCLUSION
Recommendation
Reference
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 generator.
Thus when 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 man power in starting the generator and switching over from public supply to generator and vice-versa when the supply is restored.
The important attached to cases of operation in hospitals and airport in order to save life from generator as fast as possible makes it important for the design construction of automatic change-over switch which would solve the problem of manpower and the danger likely to been countered changeover.
The electronic control monitors the incoming public supply voltage and detects when the voltage drops below a level that electrical or electronics gadgets can function depending on the utility.
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