Design and construction of an automatic phase selector
Table Of Contents
- Title Page – – – – – – – – – – i Dedication – – – – – – – – – – ii Approval page – – – – – – – – – iii Acknowledgement – – – – – – – – – iv Abstract – – – – – – – – – – v Table of Contents – – – – – – – – – viCHAPTER ONE: INTRODUCTION
- 1.1Background of the study – – – – – – 1
- 1.2Statement of problem – – – – – – 3
- 1.3Objectives of the study – – – – – – 3
- 1.4Scope and Limitation of the study – – – – 4
- 1.5Significance of the study – – – – – – 5
- 1.6Organization of the work – – – – – – 6CHAPTER TWO: LITERATURE REVIEW
- 2.1History of automatic control – – – – – 8
- 2.2Automatic phase selector (APS) – – – – – 9CHAPTER THREE: METHODOLOGY, DESIGN AND IMPLEMENTATION
- 3.1Introduction – – – – – – – – 12
- 3.2Power Supply Unit – – – – – – – – 14
- 3.3Voltage Sensing Unit – – – – – – – 17
- 3.4Switching Unit – – – – – – – – 19
- 3.5General Circuit Operation – – – – – – 21
- 3.6List of Components – – – – – – – 24CHAPTER FOUR: SYSTEM DESIGN ANALYSIS
- 4.1Power supply unit – – – – – – – 25
- 4.2Voltage Sensing Unit – – – – – – – – 29
- 4.3Switching Unit – – – – – – – – 31CHAPTER FIVE: PACKAGING, TESTING, RESULT AND DISCUSSION
- 5.1Packaging – – – – – – – – 33
- 5.2Testing – – – – – – – – 34
- 5.3Result – – – – – – – – – 35
- 5.4Discussion of result – – – – – – – – 35CHAPTER SIX CONCLUSION AND RECOMMENDATION
- 6.1Conclusion- – – – – – – – – 37
- 6.2Recommendation – – – – – – – – 38 References – – – – – – – – – 40
Thesis Abstract
This is the design and construction of an Automatic Phase Selector. In the construction work, LM324 integrated circuit (comparator) and 2N2222 transistors were used as active components alongside other passive components. The circuit components were mounted on a Vero board. Result shows that, when the three phase A.C inputs Red phase (P1), yellow phase (P2) and blue phase (P3) from public utility supply was fed to the system, the system compared the inputs with regards to phase imbalances, and the input with the highest voltage appears across the output. It also changes over from one phase to anothe4r immediately the circuit senses further phase imbalance.
Keywords Relay, Switch, Comparator, Phase Selector, Automatic.
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