THE DESIGN AND CONSTRUCTION OF A PHASE SEQUENCE CHECKER FOR THREE PHASE SUPPLY
The project is designed to check the sequence of the 3 phase supply. It is very important to know the phase sequence particularly for 3 phase motors. For example, if the 3 phase motor is used for pumping action, any phase reversal accidentally resulting in wrong sequence could force the motor run in the wrong direction. This could result in dry run of the motor to develop permanent fault.
In this project direct 3-phase AC supply 50Hz is fed through voltage drop arrangement duly stabilized by zener diodes to a logic circuit comprising of NAND gates and OR gates to detect the proper sequence of RYB by series of pulses of fixed duration.
In the event of changing the sequence from RYB to say YBR, the combination of NAND and OR gates develops an output with a missing pulse during the fixed time duration. This pulse is used in triggering an input signal to a 8051 series microcontroller through a timer to drive LEDs placed in a circle. In proper sequence the LEDs run clockwise having received no triggering.
While the sequence is not there the triggering is done which is indicated by LEDs running clockwise for some time and then anti clockwise for the next and so it continues. DC requirement of the circuit is powered from a step down transformer along with a bridge rectifier ,regulators and filter capacitor.
Further this project can be enhanced by providing a relay to circuit to cut-off the supply to the load.
TABLE OF CONTENTS
Title page
Certification
Dedication
Acknowledgement
Abstract
Table of contents
CHAPTER ONE
- Introduction
- Background of the project
- objective of the project
- significance of the project
- scope of the project
- Application of the project
- limitation of the project
- project organisation
CHAPTER TWO
- Review of Related Literatures
- Contactors
- Auxiliary Timer
- Circuit Breaker
- Indicator Lights
CHAPTER THREE
- Design methodology
- System block diagram
- Basic Principles
- Principles of Operation
- Circuit diagram
- Circuit description
- Theory of components used
CHAPTER FOUR
- Research Design and Construction
- Project Construction
- Mounting of Components
- Packaging
- Precaution
- Testing
CHAPTER FIVE
- Associated Fault and Remedies
- Conclusion
- Reference
CHAPTER ONE
1.1 INTRODUCTION
The forecast is destined to pattern for the sequence of the 3 phase supply. It is very significant to know the phase sequence primarily for 3-phase motors. For example, if a 3-phase motor is used for pumping, in which any phase reversal unintentionally ensuing in wrong sequence could force the motor to run in a wrong direction, which could lead to the dry run of the motor that may progresses to a permanent damage.
A voltage drop arrangement is made wherein a direct 3-phase AC supply of 50/ 50Hz,rectified is fed through after duly stabilized by zennor diodes to a logic circuit comprising of NAND gates and OR gates to perceive the proper sequence of RYB by a series of pulses of fixed duration. In the event of changing the progression from RYB to, for instance, YBR during the fixed-time duration the combination of NAND and OR gates develops an output with a missing pulse. For triggering an input signal to 8051 series microcontroller, this missing pulse is fed through a timer to drive LEDs placed in a circle from the out put of the microcontroller. During the proper sequence, the LEDs are made to run clockwise by the program as there is no triggering received. In the absence of a sequence, the triggering is done and will be indicated by LEDs running clockwise for some time, and then anti-clockwise for the next time, and so on indicating out of synchronization.
The DC which is required for the circuit is supplied from a Step-down transformer. A bridge rectifier is interfaced to convert AC to DC and to regulate the generated power for the functioning of the components that are implanted in the circuit with regulators and filter capacitors.
Fostering this envisions can be heightened by implementing a relay to the circuit for cutting off to the supply to load...READ MORE
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