What duration of voltage deviation greater than or equal to 10% nominal is considered reportable?

A duration of voltage deviation greater than or equal to 10% nominal is considered reportable when it lasts for 15 minutes or longer. This standard helps maintain grid reliability and ensures that any significant voltage issues can be promptly addressed to prevent further complications, such as equipment damage or cascading failures in the electrical system. Monitoring this threshold assists reliability coordinators in maintaining system stability and provides essential data for operational assessments and planning. By establishing a 15-minute duration as the reportable timeframe, it balances the need for timely reporting with the practicality of managing transient voltage issues that may occur briefly without causing serious consequences.