THE DESIGN AND CONSTRUCTION OF A THREE PHASE AUTOMATIC PHASE SELECTOR

THE DESIGN AND CONSTRUCTION OF A THREE PHASE AUTOMATIC PHASE SELECTOR

ABSTRACT

Power instability and phase failure has posed serious threat to economic development in Nigeria. Most companies; industrial, commercial and even domestic are dependent on public power supply which have erratic supply such as phase failure, phase imbalances or total power failure due to one or more technical problem in power generation, transmission or distribution. Much time would be wasted in the process of manual change over. This means that time and the process needed for the phase change may cause serious damages to machines even the products and may pose a threat to the life of the person while moving from one phase to a more suitable one.Hence, there is need for automation of phase change during phase failure or total power failure in order to safe guard consumer appliances from epileptic power supply. The following objective were achieved; to develop a simple low cost device aimed at easing the prevalent burden faced by delicate industries and institutions electrical equipment’s, to reduce the damages caused to our household equipment’s, eliminating the loss of human life due to electric shock from the manual selection of the three phases during supply of high voltage.The automatic three phase power system selector was designed and constructed. The device automatically switches over to the alternative phase that has voltage when there is power outage or extremely low voltage in the phase which the load is connected without the power going off. The selector links the load and the other phases and relay switches allowing the usage of the remaining phases where there is outage on the mains source without disturbing or interrupting the load. It maintains constant power supply to the load by automatically activating the phases when the need arises.the specification of Output power, Frequency, Input voltage, and output voltage of the designed Automatic Three phase selector are,Output power=500W, Frequency=50Hz,Input voltage =12Vdcand Output voltage=18Vac.The device reduced the possibility of power being off completely in case of power failure in any particular phase if users connect their electronics gadget to it and reduced the response time needed to switch from one phase to another. It is recommended that a software model of the design should be developed and simulated to enable further research and improve the performance of the system.

Title Page———i

Certification——–ii

Dedication———iii

Acknowledgement——-iv

Abstract ———vi

Table of Content——–vii

 

Chapter One

1.0 Introduction ——-1

1.1 Statement of Problem——4

1.2 Purpose of the Study——5

1.3 Significance of Study——8

1.4 Limitation——–9

1.5 Scope of Study——-11

 

Chapter Two

2.0 Review of Related Literature —-12

2.6 Summary of Literature Review—- 19

 

Chapter Three

3.0 Research Methodology and Procedure—22

3.1 Population ——–22

3.2 Sample and Sampling Technique—-22

3.3 Validation of the Instrument —-23

3.4 Reliability of the Instrument —–23

3.5 Data Analysis——-23

 

Chapter Four

4.0 Presentation and Discussion of Result—24

4.1 Analysis and interpretaion of Data—25

4.2 Discussion of Results——38

 

Chapter Five

5.0. Summary, Conclusion, and Recommendation  –40

5.1 Summary——–40

5.2 Conclusion——–41

5.3 Recommendation——42

References ———45

Appendix 1——–47

Appendix ———50

THE DESIGN AND CONSTRUCTION OF A THREE PHASE AUTOMATIC PHASE SELECTOR

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