Protection Engineering Basics and Schemes Protection Engineering | Page 190

5.7.2 over frequency Relay:
When load is less then Generation, over frequency
operated, to tackle this issue, over frequency relay signal
generation side breaker to reduce generation , this does
not necessarily means generation will only be reduce but
it can be shifted to other transmission lines via
interlocking systems of breakers.
We took 105% as pick up setting for over frequency relay.
pg. 190