DESIGN AND CONSTRUCTION OF AN AUTOMATIC CHANGEOVER SYSTEM

Transcription

1 DESIGN AND CONSTRUCTION OF AN AUTOMATIC CHANGEOVER SYSTEM BY OZOEMENA KIZITO 2006/24425EE DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING FEDERAL UNIVERSITY OF TECHNOLOGY MINNA NIGER STATE NOVEMBER 2011

2 DESIGN AND CONSTRUCTION OF AN AUTOMATIC CHANGEOVER SYSTEM BY OZOEMENA KIZITO EE DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING FEDERAL UNIVERSITY OF TECHNOLOGY MINNA NIGER STATE NOVEMBER 2011

3 DEDICATION To all staff of Donna Bella ii

4 DECLARATION I, OzoemenaKizito declare that this work was done by me and has never been presented elsewhere for the award of a degree. I also hereby relinquish the copyright to the Federal University of Technology, Minna. OzoemenaKizito Engr. O.D. Ahmed ~ Name of Student Signature and Date Signature and Date ~ L\ (~ 7 ~1~ ~ ~, GJ'~ ~xtemal Exammer Signature and Date Signature and Date iii

5 ACKNOWLEDGEMENT I wish to acknowledge the mercies, blessings, and grace of Almighty God in giving me the wisdom, strength and good health in accomplishing life tasks.my appreciation goes to my parents, Mr. Joseph Ozoemena and Mrs Jane Ozoemena for their financial, moral support and love throughout my academic program. I also wish to acknowledge the support from my supervisor, Engr. Ozomata David Ahmedfor his advice, support and intelligence in helping me accomplish this project work.a project will never be accomplished unless there is a technical backing, I wish to extend my gratitude to my very good friend Eromos~leOria-Usifo (D-Master) who stood by me through thick and thin and made sure the best was brought out of me during this project.i wish to also extend my gratitude to my technologist, Mr. SalihuDanladi for his technical support. I must not fail to thank my siblings, Melvina (Zozo), Ebuka (crespo), Ugochi (Candy) and Chidiere (mum's hand bag) for having always shown me what a loving family is.ukamaka I see you.my Gratitude also goes to Uncle Akwele, Justice Raymond Ozoemena, Barrister ChijokeOzoemena, DrNnatchiOzoemena, Uncle OgbonnaAninweze,Ozoemena's family at large for being there for me one time or the other when I needed them the most.i must not fail to thank God for my friends, IdowuAbubakar(Kabass), AdebowaleOdukoya (Otos Baba), Efretintin, 2jo, Nas, Raphyoso, justfemi, Baba-Dee, DJ Tamz,Omoba, Mary, Franca, kay, Ereboy(Emi) Tontebriggs, Nyore,Obinna, Bridge, Jamol, Henry,Obiscolalachi, F baby,effizy,gbolz, D.j Cutie, and lot more I didn't mention, you all are so great and can't be forgotten. How can I forget you ChineloOtij i, thanks for being one of my motivations. Once again lowe all my thanks to God Almighty for with Him all things are possible and to Him be glory and praise now and forever, Amen. iv

6 ABSTRACT This project deals with the design and construction of a device that would switch to an alternative source of power i.e. from PHCN to generator automatically and vice versa The project was realized using a of step-down transformer, rectifiers, Resistors, Voltage regulators, 555 timers, Diodes, Capacitors, Relays, Light emitting diodes, Circuit breaker and Volt meter. With the epileptic power supply in our country, the importance of this project cannot be under estimated both in small houses and big organizations, as it would help not only in saving stress and time, but also help in protecting household and office equipment, which is among the primary functions of engineering The design, construction and testing of this automatic change-over system are discussed, also conclusion and recommendation based on the information gotten from the research carried out is given. ' v

7 TABLE OF CONTENTS TITLE PAGE DEDICATION 11I DECLARA TION IV ACKNOWLEDGEMENT V ABSTRACT VII TABLE OF CONTENTS VIII LIST OF FIGURES XI CHAPTER ONE 1.0 INTRODUCTION 1.1 PROJECT AIMS AND OBJECTIVE 1.2 TARGET BENEFICIARlES 1.3 METHODOLOGY CHAPTER TWO 2.0 LITERATURE REVIEW MANUAL CHANGE-OVER SWITCH AUTOMATIC CHANGE-OVER SWITCH THE PURE RELAY SWITCHING (AND CONTACTORS) 6 vi

8 2.4 THE COMPONENTS OF AN AUTOMATIC CHANGE-OVER SYSTEM THEORITICAL BACKGROUND OF TRANSFORMERS THERITICAL BACKGROUND OF RELAY DESIGN AND PRINCIPLE OF OPERATION OF A RELAY TYPES OF RELAY THEORITICAL BACKGROUND OF A 555 TIMER IC THEORITICAL BACKGROUND OF A RESISTOR RESISITOR VALUE AND COLOUR CODE VARIABLE RESISTOR OR POTENTIOMETER THEORITICAL BACKGROUND OF DIODE THEORITICAL BACKGROUND OF CAPACITOR VOLTAGE REGULATOR THEORITICAL ACKGROUND OF VOLTAGE REGULATOR 21 CHAPTER THREE 3.0 COMPONENTS SELECTION AND COMPUTATIONAL RESULTS SELECTION OF COMPONENTS 23 vii

9 3.2 CIRCUIT BREAKER DESIGNS RELA Y DESIGNS ELECTRONIC TIMER RESISTOR CONDUCTOR DESIGN CONTROL CIRCUIT POWER SUPPL Y TRANSFORMER RECTIFIER CAPAClTOR VOLTAGE REGULATOR 27 CHAPTER FOUR 4.0 TEST/OBSERVATION RESULTS DISCUSSION OF RESULTS OBTAINED 30 CHAPTER FIVE 5.0 RECOMMENDA TION AND CONCLUSION RECOMMENDA TION 31 viii

10 5.2 CONCLUSION 31 REFERENCES 32 LIST OF FIGURES FIG 1.1BLOCK DIAGRAM OF THE AUTOMATIC CHANGE-OVER SYSTEM 4 FIG 2.1 STEP DOWN TRANSFORMER 9 FIG 2.2 AN IDEAL TRANSFORMER 10 FIG 2.3 PHYSICAL VIEW OF A RELAY II FIG 2.4 LATCHING RELAY WITH PERMANENT 13 FIF 2.5 A 555 TIMER IC 14 FIG 2.6 A MONOSTABLE 555 TIMER CIRCUIT DIAGRAM 15 FIG 2.7 A STABLE 555 TIMER CIRCUIT DIAGRAM 15 FIG 2.8 RESISTOR 16 FIG 2.9 A LINEAR RESISTOR 18 FIG 2.10 V ARIABLE RESISTOR 19 FIG2.11 DIODE 20 FIG 2.12 CAPACITOR 20 FIG 2.13 SYMl?OL OF A CAPACITOR 21 ix

11 FIG 2.14 A REGULATOR 22 FIG 3.1 THE DELAY CIRCUIT 24 FIG 3.2 COMPLETE AUTOMATIC CHANGE OVER SWITCH CIRCUIT DIAGRAM 28 x