StatusThe formal comment period and ballots for draft one of Reliability Standard PRC-005-7 – Protection System, Automatic Reclosing, and Sudden Pressure Relaying Maintenance concluded 8 p.m. Eastern, Monday, July 24, 2023. The comments received and ballot results can be accessed via the links below.
Background On May 14, 2019, NERC received a Standard Authorization Request (SAR) from the North American Generator Forum (NAGF) seeking to revise Reliability Standard PRC-005-6 – Protection System, Automatic Reclosing, and Sudden Pressure Relaying Maintenance to clarify the applicability of PRC-005-6 to the protective functions within an Automatic Voltage Regulator (AVR) and provide the prescribed maintenance activities. The SAR also requests the PRC-005-6 Supplementary Reference and FAQ be updated to reflect the changes to the standard.
Purpose/Industry NeedThe SAR proposes revisions to PRC-005-6 to provide clarity that the protective functions enabled within excitation systems (including analog/digital AVRs), and other control systems, that respond to electrical quantities and act to cease injecting current (75 MVA or greater) or trip Bulk Electric System (BES) elements either directly or via lockout or auxiliary tripping relays are within the scope of the standard. Without clear applicability, the industry is struggling with how to implement PRC-005 and what testing is acceptable to meet the required maintenance activities prescribed by PRC-005. The lack of clarity presents a reliability gap in the application of PRC-005.
Additionally, there are Protection System Station direct current (DC) supply technologies that do not currently have maintenance activities established in PRC-005. The standard needs to address battery-based station DC technologies that are not covered by PRC-005 and consider other emerging technologies, both battery-based and non-battery-based.
Standard(s) Affected – PRC-005-6
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PRC-005-7Clean | Redline to Last Approved
Supporting MaterialsTechnical Rationale
Unofficial Comment Form
SupplementaryReference and FAQ
Standard Authorization RequestClean | Redline to Last Posted
Unofficial Comment Form (Word)
06/02/20 - 07/08/20
07/30/19 – 08/28/19
Consideration of Comments
Drafting Team Nominations Supporting Materials Unofficial Nomination Form (Word)
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