A RESEARCH PROJECT
BY
NNAEMEKA ORIOHA
EE/2017/167
SUBMITTED TO
DEPARTMENT OF ELECTRICAL ELECTRONIC ENGINEERING FACULTY OF ENGINEERING CARITAS UNIVERSITY, AMORJI-NIKE, ENUGU.
IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF BACHELOR OF ENGINEERING (B.ENG)
AUGUST 2017
APPROVAL PAGE
This project has been read and approved by the undersigned as with the requirement at the department of Electrical Electronic Engineering of Caritas University Amorji Nike Enugu for the award of Bachelor of Engineering (B.Eng.) in Electrical Electronic Engineering.
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Engr. Ejimorfor Date
(Project supervisor)
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Engr. Ejimofor Date
(Head of Department)
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External Supervisor
DECLARATION
I declare that this project material is an original work done by me under the supervision of Engr. Ejimorfor, department of electrical electronic engineering faculty of engineering caritas university, amorji-nike, enugu
DEDICATION
This project is dedicated to Almighty God and to my parents Engr. & Mrs. Chukwu A. Orioha and to my beloved brothers and sisters whose ever loving kindness and support has seen me through my years of studies.
ACKNOWLEDGEMENT
I wish to express my immense gratitude to God Almighty for his mercy, guidance and protection towards me for seeing me through the rigors of this work. I am greatly indebted to my supervisor Engr. Ejimofor for his kind gesture and whose critics lead to the achievement of this work. I also will remain grateful to the tremendous contribution of my lecturers Engr. Ojobor (the Dean of Engineering Faculty), Engr. Ejimofor (Head of Electrical Electronic Engineering Department), Engr. Mbah, Engr. Ochi, and all the staff of Electrical Electronic Engineering both academic and non academic staff for their intellectual upbringing. My special appreciation goes to my loving parents Engr. & Mrs. Chukwu A. Orioha, my grandparent, my uncles and aunties, my brothers and sisters whose moral and financial support cannot be over emphasized. Also my sincere gratitude and special regards to my friends too many to mention whose encouragement also lead to the success of this work.
Industries require three phases power to run their machinery. Some of them require continuous \ uninterrupted power to maintain their data. We introduce auto phase selector unit for those equipment whose supply is single phase. The single phase supply is selected automatically from three phases supply.The objective of the APS is to ensure that there is continued commercial power supplied to the site at all times so as to ensure that the Base Transceiver Station (BTS) runs on commercial power until all available phases are either out of electrical tolerance or completely off. This is a micro controller based unit and is used with three phase electrical supply. Whenever the supply of one or two phases of a three phase electrical line goes off, the APS system automatically distributes the electrical supply from the active phase to the failed phases. This ensures continuous power supply through all the three phases even if one phase is active.
A Microcontroller based system will continuously monitor the incoming phase and accordingly display the details on an alphanumeric LCD also it will display the output phase.
FIG. 3.1 BLOCK DIAGRAM OF A MICROCONTROLLER BASED PHASE SELECTOR FROM A THREE PHASE SUPPLY .
DESIGN AND CONSTRUCTION OF AN AUTOMATIC PHASE SELECTOR FROM A 3-PHASE SUPPLY
ABSTRACT
This project work is on the design and construction of automatic phase selector for 3-phase power supply. It provides a means of switching from one phase of AC mains to another in the case of failure in the existing phase; This project has been improved on the existing types of electromechanical device that has being in use over the years.
Hence this has been achieved by the use of operational amplifier and high current relay switches and it is powered by 12V dc power supply.
The aim of this work is to design and construct an Auto Phase Selector introduces an automatic solution to overcome power fluctuation/phase interruption by selecting next most healthy available phase to feed the equipment without any notice of power outage.
FIG. 3.1 BLOCK DIAGRAM OF A PHASE SELECTOR FROM A THREE PHASE SUPPLY USING OPP-AMPS .
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