What is Transformer Overcurrent Relay, Testing of Overcurrent Relay,Electromechanical relay in Tamil

An overcurrent relay is a type of protective relay which operates when the load current exceeds a pickup value. How is the Overcurrent Relay Operating System? If there is a current value at a normal value, the output contacts are pulled. If this current is found to be higher than the desired value, the output contacts open with a delay and also disable the system it is connected.