Overcurrent Relays

An overcurrent relay is a type of protective relay which operates when the load current exceeds a pickup value. It is of two types: instantaneous over current (IOC) relay and definite time overcurrent (DTOC) relay. The ANSI device number is 50 for an IOC relay or a DTOC relay.

[@1kburke2]

Where are these from? Where can we find the complete series? I found some on turbine-generator control but it didn't include the whole video. Really love this guy