The project is designed to control a circuit breaker by using a password for the safety of electric man. Critical electrical accidents to line men are on the rise during electric line repair due to lack of communication and co-ordination between the maintenance staff and electric substation staff.

The system has two purposes. Firstly, whenever there is overload, the system shuts down automatically. The second purpose is for the electric line man safety which provides a solution that ensures safety of maintenance staff, i.e., line man. The control to turn on/off the line will be maintained by the line man only because this system has an arrangement such that a password is required to operate the circuit breaker (on/off).

This system is fully controlled by a PIC microcontroller. A matrix keypad is interfaced to the microcontroller to enter the password. The entered password is compared with the password stored in the microcontroller. If the password entered is correct, then only the line can be turned on/off. The activation / deactivation of the circuit breaker is indicated by a lamp that turns on or off. Status of loads is displayed on LCD. Buzzer indicates the alerts

      The features of the project are:  

1. Keypad based password accessing.
2. Circuit breaker operation using password access.

        The major building blocks of this project are:  

1. Regulated Power Supply.
2. PIC Micro Controller.
3. Keypad.
4. Relays with driver.
5. Crystal
6. Reset.
7. LED indicators.
8. LCD display.

          Software’s used:  

1. PIC-C compiler for Embedded C programming.
2. PIC kit 2 programmer for dumping code into Micro controller.
3. Express SCH for Circuit design.

            Regulated Power Supply:

                 

Block Diagram:          

video: