How long may a load dump last under post-contingency rules?

A load dump, occurring as a result of a contingency in the electrical grid, can last up to 5 minutes in accordance with post-contingency rules. This timeframe is established to ensure that system operators can respond effectively to disturbances while minimizing disruptions to the grid.

The 5-minute duration is significant in maintaining system stability, allowing operators to assess the situation and implement corrective actions, such as redistributing power or bringing additional resources online without overwhelming the transmission network. This period is recognized as sufficient to manage typical contingencies that could lead to a load dump, balancing the need for swift response with operational considerations.

Understanding this timeframe is crucial for grid management, as it forms part of the broader strategy to maintain reliability and prevent further system degradation following an initial disturbance.