This document describes a password based on/off circuit breaker project. The project uses a microcontroller, keypad, LCD, and relay to allow line workers to safely turn power lines on and off by entering a password. This prevents electrical accidents by ensuring the power is off when workers are repairing lines. The system requires line workers to enter the password at the substation to turn a circuit on or off before working on electrical lines. The project aims to increase safety for line workers through access control and communication between the substation and maintenance staff.

1. PASSWORD BASED ON/OFF CIRCUIT BREAKER
Rajkiya Engineering College
Department of Electrical Engineering
Ambedkar Nagar U.P.-224122
:
Submitted to: Submitted by:
Ms. Shikha Chaudhary ABHISHEK SINGH (1473720003)
(Assistant. Professor) ANIL KUMAR (1473720009)
GOLU SONKAR (1473720015)
SHIV KUMAR KAPIL (1473720036)
A PROJECT
ON

2. CONTENTS
 INTRODUCTION
 HARDWARE COMPONENTS
 MICROCONTROLLER
 BLOCK DIAGRAM
 ADVANTAGED/DISADVANTAGES
 APPLICATIONS
 CONCLUSION
 REFERENCES

3. • Password Based Circuit Breaker is a simple project that helps in
controlling the electrical lines with the help of a password.
• Nowadays, electrical accidents to the line man are increasing, while
repairing the electrical lines due to the lack of communication between
the electrical substation and maintenance staff. This project gives a
solution to this problem to ensure line man safety. This project is
arranged in such a way that maintenance staff or line man has to enter
the password to ON/OFF the electrical line.
• Now, if there is any fault in electrical line, then the line man will switch
off the power supply by entering password and comfortably repair the
electrical line, and after coming to the substation he can switch ON the
supply to the particular line by entering the password.
INTRODUCTION

4. HARDWARE REQUIREMENTS
POWER SUPPLY BLOCK
MICROCONTROLLER (8051)
LCD
MATRIX KEYPAD
 RELAY
 RELAY DRIVER
 LED
 DIODE (1N4007)
 CAPACITORS
 RESISTORS

5. 230 V AC
50 Hz
5V
DC
12V step down
Transformer
Filter(470µf)
5v RegulatorBridge rectifier
POWER SUPPLY

6. A microcontroller is a small computer on a single integrated circuit. A
microcontroller contains one or more CPUs along with memory and
programmable input/output peripherals.
Microcontrollers are used in automatically controlled products and devices,
such as automobile engine control systems, remote controls, office
machines, appliances, power tools, toys and other embedded systems .
In this project 8bit microcontroller is used(8051).
RAM ROM
I/O
Port
Timer
Serial
COM
Port
Microcontroller
CPU
A single chip
MICROCONTROLLER

7. It is a electro magnetic switch
Used to control the electrical devices
Copper core magnetic flux plays main role here
RELAY

8. The relay's switch connections are usually labeled COM, NC and NO:
COM = Common, always connect to this; it is the moving part of the
itch.
NC = Normally Closed, COM is connected to this when the relay coil
is off.
NO = Normally Open, COM is connected to this when the relay coil is
on

9. A keypad is a set of buttons arranged in a block or "pad"
which usually bear digits, symbols and usually a complete
set of alphabetical letters. If it mostly contains numbers
then it can also be called a numeric keypad.
In order to detect which key is pressed from the matrix, the
row lines are to be made low one by one and read the
columns. Assume that if Row1 is made low, then read the
columns.
If any of the key in row1 is pressed then correspondingly
the column 1will give low that is if second key is pressed
in Row1, then column2 will give low.
KEYPAD

10. LIQUID CRYSTAL DISPLAY
(LCD)
Most common LCDs connected to the microcontrollers are 16x2 and
20x2 displays.
This means 16 characters per line by 2 lines and 20 characters per line
by 2 lines, respectively.
The standard is referred to as HD44780U, which refers to the
controller chip which receives data from an external source (and
communicates directly with the LCD.

12. ADVANTAGES
• Avoids electrical accidents to line man
• Project is simple and easy
• Uses commonly available components
• It gives no scope of password stealing
• It is effective in providing safety to the working staff
• It can be easily installed

13. DISAVANTAGES
• After the installation the maintenance cost increases
• The programming of this system is too large and complicated
• By forgetting the password it becomes difficult to operate the system

14. APPLICATIONS
• Used in electrical substations to ensure line man safety
• This system is used in buildings and houses
• Used in hotels and shopping malls to save the power.
• Can also be used as Password based electrical appliance
control or Password based Load Control system

15. CONCLUSION
The project titled ELECTRIC LINEMAN SAFETY BY USER
CHANGEABLE PASSWORD BASED CIRCUIT BREAKER‘ gave the
following conclusions. We also feel that a theoretical study, perhaps from a
Game theoretic point of view on the effect of circuit breakers on the markets
should yield interesting results. One of the reasons is that unlike a market
with no circuit breakers, the agents in the market with circuit breakers all
have a common value to use as a goal and hence could act in co-ordination,
though they may not even exchange any information.

16. REFERENCES
http://www.electronicshub.org/password-based-circuit-breaker
http://www.edgefxkits.com/electric-line-man-safety-with-password-based-circuit-
breaker
http://www.atmel.com/tools/atmelstudio.aspx
https://www.labcenter.com/
https://en.wikipedia.org/wiki/Embedded_system