Grid Operation Knowledge (General)

Question 1

What is LFSM-O?

Answer 1

Limited frequency sensitive mode at overfrequency

Question 2

When is LFSM-O active?

Answer 2

When the system is in an EMERGENCY STATE of overfrequency and needs fast reduction of active power (all frequency containment reserves (FCR) in negative direction have already been deployed)

Question 3

What is LFSM-U?

Answer 3

Limited frequency sensitive mode at underfrequency

Same as LFSM-O except for low freq conditions.