Project 2019-04 Modifications to PRC-005-6

Related Files

The formal comment period for the Project 2019-04 Modifications to PRC-005-6 Standard Authorization Request (SAR) concluded 8 p.m. Eastern, Wednesday, July 8, 2020. The drafting team will review all responses received and determine the next steps of the project.

On May 14, 2019, NERC received a 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 Need
The SAR proposes revisions to PRC-005-6 to provide clarity that the protective functions enabled within excitation systems (including analog/digital Automatic Voltage Regulators (AVRs)), and other control systems, that respond to electrical quantities and act to cease injecting current (75 MVA or greater) or trip 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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Consideration of Comments

Standard Authorization Request
Clean | Redline to Last Posted

Supporting Materials

Unofficial Comment Form (Word)


Comment Period


Submit Comments​

06/02/20 - 07/08/20

Comments Received

Standard Authorization Request

Supporting Materials

Unofficial Comment Form (Word)​

​Comment Period


Submit Comments

07/30/19 – 08/28/19​

Comments Received​


Consideration of Comments


Drafting Team Nominations

Supporting Materials

Unofficial Nomination Form (Word)


Nomination Period


Submit Nomination

07/30/19 – 08/28/19