CHAPTER ONE
INTRODUCTION
1.1 General Concepts
In previous years, the problem of lack coordination between the electric power station and the maintenance team that in switch off the circuit breakers during the line men on their work or has not finished yet removing or clearing faults, causing a high damages including injury the team of maintenance with an electric shocks may lead to death or combustion at least, also include damages to the equipments that use.
So there must be a way to secure and gives a protection to the line man or the maintenance team by not returning the circuit breaker while the maintenance team on a work and that by the line man himself and this insurance is in the form of a password entered by a keypad located in the station, or by a sending a message to the controller include the password.
1.2 Problem Statement
To give an environment to the line man about no one can return the line unless he get finished his work we made a circuit breaker based with password to achieve a safely system to the team that work on maintenance whatever it is.
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow. Unlike a fuse, which operates once and then must be reset (either manually or automatically) to resume normal operation. When operate manually we see fatal electrical accidents to the line man are increasing during the electric line repair due to the lack of communication and coordination between the maintenance staff and the electric substation staff.
1.3 Objectives
The main objectives of this study are to:
• Design of Password Based Circuit Breaker circuit.
• Implementation of Password Based Circuit Breaker circuit.
• Simulate of controlling Password Based Circuit Breaker circuit.
1.4 Methodology
• Study all of previous studies.
• Research about circuit breaker types.
• Research about keypad, LCD and GSM module.
• Drawing the block and wire diagram.
• Starting with the programming logic.
• Design of Password Based Circuit Breaker.
1.5 Project Layout
This project consists of five chapters: Chapter One gives an introduction about the principles of the project, in addition its reasons, motivation and objectives. Chapter Two discusses the theoretical background of Control Systems, global system for mobile (GSM) System, Microcontroller System, circuit breaker Operated. Chapter Three descripe the mechanical part of relay, The electrical part, Software and Hardware. Chapter Four shows the System Implementation and the experimental results. Finally, Chapter five provides the conclusion and recommendations.
.