relay

0ur project will attempt to design and fabricate over current protection relay using  micro controller. The micro controller will cause the circuit breaker to trip when the current from load current reaches the setting value in the micro controller.

The over current setting may be given by definite time or inverse
definite minimum time (IDMT) characteristic.

The whole idea of this project is to isolate the faulty conditions from the load
current by controlling the circuit breaker tripping coil using  micro controller.
When there are over current at the bus bar (load current), current transformer will
supply the reduced current to current sensor.
Current sensor will be used to measure the load current and will convert this
current to certain voltage level as an input to microcontroller. Microcontroller will
process and compare this voltage with desired voltage setting and will operate the
tripping coil in circuit breaker if input voltage reaches the setting value.

And we would also like to sample the data of current at regular intervals and log it to a memory system or either LAN.

lilli prasath said:

Microcontroller will
process and compare this voltage with desired voltage setting

What are timing constraints? How fast reaction time of your current protection relay shall be?

Sir actually we planned to do the timing constraints depending on certain formulas, depending on the rated current and application. So please help us in choosing right micro controller

lilli prasath said:

So please help us in choosing right micro controller

If you have no constraints except "Microcontroller will process and compare this voltage with desired voltage setting", then any microcontroller with ADC will do the job.