What is the voltage limit for immediate action in pre-contingency scenarios?

In pre-contingency scenarios, the voltage limit for immediate action is designated as "immediate" because it refers to the urgency required to maintain system reliability and prevent cascading failures. Voltage levels may fluctuate due to expected or unexpected disturbances, and preserving system stability is critical. The term "immediate" implies that operators and system controllers must respond without delay when voltage levels reach certain thresholds, ensuring that corrective actions are taken swiftly to reinforce the grid's integrity.

This swift responsiveness is essential in maintaining the reliability of the electric grid. An immediate reaction allows for the activation of contingency plans, such as redispatching generation or implementing load-shedding strategies, to rectify the situation before it escalates into a more serious issue. Other response timelines, such as longer durations, would be inadequate for addressing potentially critical voltage issues that could arise suddenly in the system.