Modules · Event analysis · Module 080
PRC-024-4 Ride-Through Event Review for Synchronous Generators
Disturbance records from your synchronous plant checked against the standard's no-trip zones, with any trip inside them analyzed and corrected.
About this module
What this module covers.
PRC-024-4 applies to synchronous generators, Type 1 and Type 2 wind resources, and synchronous condensers; inverter-based resources (IBRs) are covered by PRC-029-2. It requires each Generator Owner and Transmission Owner to set applicable frequency protection in accordance with PRC-024-4 Attachment 1 (R1) and applicable voltage protection in accordance with PRC-024-4 Attachment 2 (R2), such that the protection does not cause the Facility to trip within the "no trip zone" during a frequency or voltage excursion, except for documented and communicated regulatory or equipment limitations (R3).
This module screens disturbance records from your synchronous plant against the PRC-024-4 no-trip zones and, when protection tripped inside a zone, records the analysis, root cause, and corrective action in an event review workflow and report.
Module: 080
Kind: Event analysis
Governing body: NERC
Applies to: Operating plants
Typical time: Days per event, not weeks
Dashboard capabilities
- Every Common Format for Transient Data Exchange (COMTRADE) record from your plant is screened against the PRC-024-4 no-trip zones when your plant profile records synchronous generation; IBR plants are not screened under this standard.
- You see the voltage and frequency excursions drawn against the no-trip zones, with each excursion listed.
- A record that stayed inside the no-trip zones, or whose trip happened outside them, passes; a trip inside a zone is reported as a finding naming the crossing and the time.
- From a finding you open the PRC-024-4 event review workflow with the excursions already filled in, and record the findings, the root cause, the corrective action with its schedule, and the supporting evidence in one place.
- You receive a PRC-024-4 event review report in the same format as our other event review reports.
Support services
What GridStrong does inside this module.
Task 1: Develop Compliance Procedure
- Create an audit-ready compliance procedure for meeting the PRC-024-4 requirements, working collaboratively across your engineering, operations, and compliance departments. This includes:
- Identifying applicable assets, functions, subject matter experts (SMEs), roles, responsibilities, and ownership
- Determining specific actions and evidence to demonstrate compliance with specific requirements and measures
- Conducting a gap analysis comparing current practices with the standard's requirements, identifying missing processes, incomplete documentation, any staff training needed, etc.
- Developing clear step-by-step procedures for PRC-024-4 that align with your internal controls and documentation policies, including review of trips inside the no-trip zones, root-cause analysis, and corrective action tracking
- Establishing compliance timelines that align with the standard's deadlines
- Defining specific compliance evidence per site
Task 2: Ride-Through Event Review (for each finding)
- Review the disturbance record against the generator's frequency and voltage protection settings
- Determine why the protection tripped inside the no-trip zone, including any documented regulatory or equipment limitation
- Propose corrective actions and a schedule
- Compile the evidence for the review
Final deliverables
- Task 1: Compliance procedure for PRC-024-4 event reviews.
- Task 2: PRC-024-4 event review report for each finding, including findings, root cause, corrective actions, schedule, and evidence.
What we need from you
- COMTRADE disturbance records from your plant's recorders.
- Your plant profile's generation technology.
- Generator frequency, voltage, and volts per hertz protection settings, and any documented regulatory or equipment limitations.
Assumptions and considerations
How the scope is bounded.
- You supply the disturbance records and protection settings needed for each review.
- Applicability is read from your plant profile's generation technology.
- Data is assumed to be time synchronized or to carry accurate time stamps across data sources.
- We do not assume liability for any data or information you supply that is inaccurate or incorrect.
Other modules
Every module runs on the same record.
Run this module on one site.
Tell us the plant and the deadline. An engineer confirms the inputs, the schedule and what the Dashboard needs from you.