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Misoperations

​​​​​​​Misoperations are a key risk facing the Bulk Power System, and remain an area of focus in the industry.  Misoperations are defined as “the failure of a Composite Protection System to operate as intended for protection purposes.”  Misoperations include a Protection System’s failure to operate, slowness in operating, or operating when not required during either a fault or non-fault condition. 

Misoperations contribute to, and tend to exacerbate the impact of, automatic transmission outages, which adversely affect the reliability of the BES. ​ Misoperations are a key risk facing the Bulk Power System, and remain an area of focus in the industry.  Included below are several ReliabilityFirst Misoperations Analysis documents, which provide summaries of Protection System issues, details and corrective actions associated with those issues, and lessons learned.


 Misoperation Rate by Region and NERC by Year

*NERC 2019 State of Reliability Report

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