What voltage rating must not be violated following a simulated facility or failure according to PJM?

The voltage rating that must not be violated following a simulated facility or failure according to PJM is the Emergency voltage rating. This rating is established to ensure that the transmission system can continue to operate safely and effectively even during unforeseen events or conditions, such as equipment failures or unexpected demand surges.

In situations where the system is stressed or operating under emergency conditions, maintaining voltage levels within this rating helps to prevent further issues, such as cascading failures or system instability. Emergency ratings allow for some flexibility in operations, but crossing this threshold can lead to more severe reliability issues and potentially affect the stability of the entire transmission grid.

Understanding the importance of the Emergency voltage rating is crucial for maintaining grid reliability and ensuring that the system can recover from disturbances without leading to significant operational consequences. Consequently, this rating serves as a critical guideline for transmission operators and planners when assessing system performance under stress.