5.1.2 Frequency Deviation
p. p. 16
5.1.2 Frequency Deviation When a large frequency excursion occurs during normal operations, Balancing Authority areas connected synchronously to the Eastern Interconnection shall continue to operate in the tie line bias area control mode u...
AI summary The text discusses the operational procedures for Balancing Authority areas during large frequency excursions, specifying that they should continue in tie line bias area control mode unless it adversely affects reliability.