Modules · Modeling studies · Module 032
PRC-025-2 Generator Relay Loadability Evaluation
Load-responsive relays set to avoid unnecessary tripping during disturbances that pose no risk to the equipment.
About this module
What this module covers.
NERC PRC-025-2 requires Generator Owners to set load-responsive protective relays associated with generation Facilities at a level to prevent unnecessary tripping of generators during a system disturbance for conditions that do not pose a risk of damage to the associated equipment.
This module covers the technical assessment and studies to develop compliance evidence for NERC PRC-025-2 for each IBR plant.
Module: 032
Kind: Modeling studies
Governing body: NERC
Applies to: Operating plants
Typical time: Two to three weeks, all in, including your review
Support services
What GridStrong does inside this module.
- Identify all applicable protective elements in the IBR plant for PRC-025-2 evaluation such as relay elements 21, 50, 51, 67 and 51V.
- Collect and analyze the relay protection settings for applicable elements. Evaluate the settings of each applicable element against the loadability criteria of the applicable PRC-025-2 Attachment 1 option, and check coordination with the plant's PRC-029-2 ride-through curves.
- Select the applicable evaluation methods per Attachment 1 of PRC-025-2 for each element.
- For each applicable protective function, perform the applicable evaluation and document whether the existing settings are compliant. If settings are non-compliant, develop a corrective action plan to adjust the settings.
- Document analysis including protective function IDs, evaluation method(s) used, setting values and thresholds, results, corrective action plans needed, etc.
- Provide recommendations for changes to settings, if required.
- Note: Relay loadability should also be coordinated and aligned with ride-through performance, capability curves, protection coordination, and model validation efforts.
Final deliverables
- PRC-025-2 Compliance Evaluation Report, including inventory of protection functions and settings, evaluation and results, and any corrective actions as needed.
- Recommended updates to relay settings and plant protection/control documentation where necessary to support PRC-025-2 requirements.
What we need from you
- Generating unit data and type
- Plant single line diagram and grounding configuration
- Relay diagrams, configuration, protection calculation sheets, protection philosophy documents, and settings files
- IBR unit and plant capability curve (from testing, reports, or OEMs)
- Voltage and frequency ride-through capability data
- PT/VT ratios and wiring configurations and other related documentation, as needed
- NERC MOD-025, MOD-026/MOD-027, PRC-019, PRC-024 and PRC-029 reports (if available)
Assumptions and considerations
How the scope is bounded.
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.