What percentage system-wide voltage reduction is reportable for a Transmission Operator (TOP)?

For Transmission Operators (TOP), a reportable system-wide voltage reduction is set at 3%. This percentage is established to ensure that operators can promptly identify and manage abnormal situations that may impact system reliability. In the context of transmission systems, voltage levels are crucial for maintaining stability and ensuring that electricity is efficiently delivered across the grid.

When a voltage reduction of 3% or more occurs, it can signify potential issues within the transmission system, possibly due to load changes, generation issues, or equipment failures. Reporting this level of voltage reduction allows for timely responses and coordination among Transmission Operators and other entities to address any underlying concerns.

Establishing a threshold at this percentage is a critical aspect of grid management, as it aligns with best practices in reliability and risk management, ensuring that enough time and resources can be allocated to investigate and mitigate any potential reliability issues. This standard is well recognized in the industry to maintain operational integrity and support effective communication between entities, which is essential for overall system reliability.