What is the time limit for pre-contingency thermal limits under normal conditions?

The time limit for pre-contingency thermal limits under normal conditions is 15 minutes. This time frame refers to the maximum duration that a transmission facility can operate at or near its thermal limits before corrective actions must be considered to prevent overheating and potential damage to the infrastructure.

In practical terms, this 15-minute rule provides operators with a brief window during which they can assess the situation and make necessary adjustments to the system, such as redistributing loads or bringing in additional resources, to ensure the stability and safety of the transmission network. Adhering to this time limit is critical for maintaining the reliability of the power system and minimizing risks associated with thermal overloads. As such, this parameter is integral to effective transmission planning and operational protocols within the PJM framework.