NERC PRC-024 ensures generating resources can ride through voltage and frequency disturbances without tripping unnecessarily — a key safeguard for grid stability. Yet, many entities fall short of compliance due to avoidable missteps. Here are the four most common causes of PRC-024 violations:
- Miscalculating Percentage Completion: Many organizations misinterpret how to calculate the percentage of applicable facilities completed for each compliance deadline. Assumptions not grounded in the PRC-024 Implementation Plan can lead to false confidence and missed targets.
- Missing R1 Frequency Verification Deadlines: Entities are required to verify that generator frequency protection settings align with the PRC-024-3 ride-through curves. Failing to meet the milestone percentages set by the Implementation Plan for R1 is a common and serious compliance issue.
- Missing R2 Voltage Verification Deadlines: Similar to R1, R2 requires voltage protection settings to be verified for each applicable facility. Falling short of the required percentage thresholds by each deadline can quickly put an entity out of compliance.
- Misidentifying “Applicable Facilities:” Incorrectly defining which units fall under PRC-024 leads to flawed compliance planning. If a unit is mistakenly excluded (or included), the completion percentages for R1 and R2 become inaccurate — exposing the organization to risk even if the underlying work was completed properly.
PRC-024 compliance hinges not just on technical work but also on proper interpretation of scope, timelines, and percentage calculations. Clear definitions, careful planning, and cross-functional coordination between compliance, protection, and plant staff are critical to staying on track.
For more information on PRC-024 and how Certrec can assist with compliance, visit www.certrec.com or contact us at NERCExperts@certrec.com.
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