What is the maximum duration for a voltage limit post-contingency when normal conditions are in effect?

In the context of transmission operations, particularly in the PJM (Pennsylvania-New Jersey-Maryland) system, understanding the protocols for voltage limits following a contingency is crucial. Under normal operating conditions, there are specific guidelines regarding how long deviations from voltage standards can be tolerated to ensure system stability and reliability.

The correct answer indicates that there is no maximum duration for a voltage limit post-contingency; thus, the answer "N/A" aligns with the understanding that during normal conditions, there are typically no predefined timelines for returning to standard voltage levels after a contingency. Instead, the focus is on quickly restoring the voltage to acceptable levels without the constraint of a specific duration. This reflects the priority placed on system stability and the necessity for operators to react promptly to restore normal voltage levels.

This differs from the other options, which suggest specific time limits that do not apply under the circumstances mentioned in the question. Understanding this context helps grasp the operational guidelines that govern voltage management in transmission systems.