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Design And Construction Of Automatic Change-over For Three Phases
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START AND STOP BUTTONS
These two push buttons are used to close and open the circuit respectively. The start push button is a normally open type (NO) while the stop push button is a normally close (NO) type to breaker the circuit when need arise
3.5 CONTACTOR
Is a device designed for repeatedly making and breaking an electronic power circuit. It is usually operated magnetically. It can be operated in line or be remotely governed by pilot devices or relay. And when there is a supply to contactor coil it becomes energized for movements while if there is no supply it will breaker the contact.
PROCEDURE
(i) A plate of copper metal not thicker than 2mm is taken to the workshop
(ii) This is then cut into required dimension by the use of chisel and hammer
(iii) After cutting into pieces is then drilled at the required place
(iv) A file is used to smooth the shape in none accurate dimension
PRECAUTION
(i) Tolerance should be given to each dimension of the hole to avoid unnecessary large hole
(ii) The contactor must be of the same with the provided for it
(iii) The hole for the contactor case should be wide enough to prevent friction during attraction and releasing of contactor
(iv) Care should be taken not to use unnecessary high pressure during chiseling, this may damage metal sheet
(v) A very sharp chisel should be used to accurate dimension otherwise the gap between the groove maybe chipped up and rendered the useless.
ASSEMBLING OF THE AUTOMATIC CHANGE-OVER COMPONENT INTO THE CASING
(I) The process of assembling the change-over panel was carried out based the terminal were set into the terminal rail and boded rigidly to prevent vibration
(II) The return spring was then fixed to the right place in the contactor case
(III) The reset time is then attached to the base of the case together with the rail stand
(IV) The contactor and circuit breaker attached to the rail stand and the contactor case is fixed in the right position in the terminal house
(V) Pressing the contactor case against the force of the retaining spring and role whether the contactor is or not
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ABSRACT - [ Total Page(s): 1 ]ABSTRACT The main aim of any electric power supply in the world is to provide uninterrupted power supply at all times to all its consumers. Although in developing countries, the electric power generated to meet the demands of the growing consumers of electricity is insufficient hence instability and outage. Power instability or outage in general does not promote development in the public and private sector. The inventors do not feel secure to come into a country with constant or freq ... Continue reading---
APPENDIX A - [ Total Page(s): 1 ]BILL OF ENGENEERING MEARSUREMENT AND EVALUTION (BEME)The table below shows the cost estimate in naira and kobo of constructed automatic change-over panel.Bill of Engineering Measurement and Evaluation ... Continue reading---
TABLE OF CONTENTS - [ Total Page(s): 1 ]TABLE OF CONTENTS Title Page Certification Acknowledgements Abstract Table of Contents CHAPTER ONE1.1 Introduction 1.2 Aim and Objective of the Project 1.3 Scope of the Project CHAPTER TWO2.1 Literature Review 2.2 Manual Change-over Switch 2.3 Automatic Change-over Switch 2.4 Related Work 2.5 Reasons for Automatic Change-over Switch 2.6 Problems of Automatic Change-over Switch CHAPTER THREE3.1 Methodolog ... Continue reading---
CHAPTER ONE - [ Total Page(s): 1 ]CHAPTER ONE1.1 INTRODUCTION 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 requiring as the rate of power outages become predominantly high. Research in the field of electrical electronics engineering has led to the tremendous discovers and inventions especially in the area of automation and power control. These invention have been useful in solvi ... Continue reading---
CHAPTER TWO - [ Total Page(s): 4 ]The circuit diagram of the flip flop and switching transistor stage of the related art.Another related art was the development of a single phase automatic change-over switch. This also related to the present invention i.e. it switches electrical power supply from public supply to generator in the event of a power outage or insufficient voltage but it is apply to single phase system while the present invention is apply to three (3) phase system, moreover, the system uses an electronic control cir ... Continue reading---
CHAPTER FOUR - [ Total Page(s): 4 ]CHAPTER FOURCONSTRUCTION4.1 LIST OF COMPONENT USEDThe following electronic components used in the project are list below(1) Voltmeter (2) Casing (3) Vero-Board(4) Transformers DC 12V(5) Diodes (6) Capacitors 100(7) Resistors 4k(8) Contactors (9) 16mm2 Cables(10) 1ooAmp connector (11) Bolt and Nuts(12) Indictor light (13) Relay three phase (14) 555IC timer 4.2 VERO BOARD: is a brand of strip-board, a p ... Continue reading---
CHAPTER FIVE - [ Total Page(s): 1 ]CHAPTER FIVE5.1 CONCLUSION The automatic change-over switch has immense advantage in every area where power is required it is a fact that there is hardly any aspect of human life were electrical power is not required, at home, offices, hospital, etc. It find a wide application scope, wherever the re-ability of electrical supply is necessary, for switching to an alternative source from main.5.2 RECOMMENDATIONThe automatic change-over switch is needed in every home and of ... Continue reading---
REFRENCES - [ Total Page(s): 1 ]REFERENCEB.L. and A.K. Theraja (1997): Electrical Technology, S. chand company LTDEngr. A.O Aduloju (2003): Electrical Power System, Evidence Nigeria VentureEngr. M.B Jenyo (2007): Electrical Power System III & IV lecture Notes, UnpublishedEngr. T.A. Mustapha (2006): Electrical Power System I & II inn lecture Notes, unpublishedInternet Research: http://www.electricalsolution.comM.S. Ahmed, A.S. Mohammed & C.B. Augusibo (2006): Development of a single Automatic change-over switch Federal Universi ... Continue reading---
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ABSRACT - [ Total Page(s): 1 ]ABSTRACT The main aim of any electric power supply in the world is to provide uninterrupted power supply at all times to all its consumers. Although in developing countries, the electric power generated to meet the demands of the growing consumers of electricity is insufficient hence instability and outage. Power instability or outage in general does not promote development in the public and private sector. The inventors do not feel secure to come into a country with constant or freq ... Continue reading---