DESIGN AND IMPLEMENTATION OF PASSWORD BASED CONTROL SYSTEM FOR THREE PHASE CIRCUIT BREAKER

 

Safety is the prime concern in our day to day life. Everyone needs to be as secure as possible. The control system for a three-phase password based circuit breaker is a system that accepts only a specified password to control circuit breakers on electrical substations and is designed to control circuit breakers by using a password for the safety of linesmen.

The system is fully controlled by the 8-bitAVR microcontroller which has a 32KB of Flash memory for the program data storage. A matrix keypad is interfaced with the microcontroller to enter the password while a relay driver IC is used to interface the relays with the switch ON / OFF the loads with the microcontroller and there will also be an alternative control of using a smartphone. The entered password is compared with the password generated, if the password entered is correct, only then the line can be turned ON/OFF.

The complete circuit is built with an onboard power supply. The power supply consists of a step-down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge Rectifier. The ripples are removed using a capacitive filter, and it is then regulated to +5V using a voltage regulator which is required for the operation of the microcontroller.

To repair a particular section of the electric supply line, the lineman would like to turn off the supply to that line. For this, he first put a request to the system. Then the system now requests for the password through LCD display. 

DESIGN AND IMPLEMENTATION OF PASSWORD BASED CONTROL SYSTEM FOR THREE PHASE CIRCUIT BREAKER

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