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pdfExhibit B
Implementation Plan
Implementation Plan
Project 2016-04 – Modifications to PRC-025-1
Reliability Standard PRC-025-2
Applicable Standard
PRC‐025‐2 – Generator Relay Loadability
Requested Retirement
PRC‐025‐1 – Generator Relay Loadability
Prerequisite Standard
None
Applicable Entities*
Generator Owner
Transmission Owner
Distribution Provider
*See the proposed standard for detailed applicability for functional entities and Facilities.
Terms in the NERC Glossary of Terms
No definitions are proposed as a part of this standard.
Background
The Reliability Standard PRC‐025‐1 went into effect in the United States on October 1, 2014 under a
phased implementation plan based on two time frames. The first timeframe was provided to the
Generator Owner, Transmission Owner, or Distribution Provider to apply settings to its existing load‐
responsive protective relays that are capable of meeting the standard while maintaining reliable fault
protection. The second and extended timeframe was provided to the Generator Owner, Transmission
Owner, or Distribution Provider that determined its existing load‐responsive protective relays require
replacement or removal. The PRC‐025‐1 standard drafting team recognized that it may be necessary to
replace a legacy load‐responsive protective relay with a modern advanced‐technology relay that can be
set using functions such as load encroachment or that removal of the load‐responsive protective relay is
the best alternative to satisfy the entity’s protection criteria and meet the requirements of PRC‐025‐1.
General Considerations
This Implementation Plan supersedes and retires the Implementation Plan PRC‐025‐1 – Generator Relay
Loadability1 such that entities are not required to implement the requirements in the PRC‐025 Reliability
Standard until the dates provided herein. In drafting this Implementation Plan, the PRC‐025‐2 standard
drafting team considered the scope of the proposed revisions and the timing for regulatory approvals
with respect to the phased‐in implementation dates for PRC‐025‐1. The first U.S. phased‐in
implementation date for PRC‐025‐1 of October 1, 2019 applies to load‐responsive protective relays where
the applicable entity will be making a setting change to meet the setting criteria of the standard while
maintaining reliable fault protection. The second U.S. phased‐in implementation date for PRC‐025‐1 of
October 1, 2021 applies to load‐responsive protective relays where the applicable entity will be removing
or replacing the relay to meet the setting criteria of the standard while maintaining reliable fault
protection.
The PRC‐025‐2 Implementation Plan reflects consideration of the following:
The phased‐in implementation dates for PRC‐025‐1,
The proposed Option 5b reduces the implementation burden to the applicable entities,
The proposed revisions to Options 14b, 15b, and 16b may give reason for entities to re‐evaluate
their settings for load‐responsive protective relays,
A few proposed Option(s) that now include the 50 element, and
Generator outage cycles.
Effective Date
PRC‐025‐2
Where approval by an applicable governmental authority is required, the standard shall become effective
on the first day of the first calendar quarter after the effective date of the applicable governmental
authority’s order approving the standard, or as otherwise provided for by the applicable governmental
authority.
Where approval by an applicable governmental authority is not required, the standard shall become
effective on the first day of the first calendar quarter after the date the standard is adopted by the NERC
Board of Trustees, or as otherwise provided for in that jurisdiction.
1 http://www.nerc.com/pa/Stand/PRC0251RD/PRC_025_1_Implementation_Plan_2013_06_20_Draft_4_(Clean).pdf
Implementation Plan
Project 2016‐04 – Modifications to PRC‐025‐1
2
Effective Date and Phased-In Compliance Dates
Load‐responsive protective relays subject to the standard
Each Generator Owner, Transmission Owner, or Distribution Provider shall not be required to comply with
Requirement R1 until the following dates after the effective date of Reliability Standard PRC‐025‐2:
Requirement
R1
Applicability
Each Generator Owner,
Transmission Owner, and
Distribution Provider shall apply
settings that are in accordance
with PRC‐025‐2 – Attachment 1:
Relay Settings, on each load‐
responsive protective relay while
maintaining reliable fault
protection.
Implementation Date
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, the
later of October 1, 2019 or 12 months after the
effective date of Reliability Standard PRC‐025‐2,
except as noted for the PRC‐025‐2 – Attachment
1, Table 1 Relay Loadability Evaluation Criteria,
Options listed below
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, the later of
October 1, 2021 or 36 months after the effective
date of Reliability Standard PRC‐025‐2, except as
noted for the Table 1 Relay Loadability Evaluation
Criteria Options listed below
Phased-in implementation of specific Table 1 Relay Loadability Evaluation Criteria Options
Option
Option 5b
Application and Relay Type
Asynchronous generating unit(s)
(including inverter‐based
installations), including Elements
utilized in the aggregation of
dispersed power producing
resources applying any phase
overcurrent relay (e.g., 51, or 51V‐
R – voltage‐restrained)2
Implementation Date
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 24
months after the effective date of Reliability
Standard PRC‐025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 48 months
after the effective date of Reliability Standard PRC‐
025‐2
2 Phased‐in implementation of the phase overcurrent relay 50 element is provided under Options 5a and 5b.
Implementation Plan
Project 2016‐04 – Modifications to PRC‐025‐1
3
Synchronous generating unit(s),
Options 2a, including Elements utilized in the
2b, and 2c aggregation of dispersed power
(50 element producing resources applying,
only)
specifically the phase overcurrent
relay 50 element
Options 5a
and 5b (50
element
only)
Asynchronous generating unit(s)
(including inverter‐based
installations), including Elements
utilized in the aggregation of
dispersed power producing
resources applying, specifically
the phase overcurrent relay 50
element
Generator step‐up transformer(s)
Options 8a, connected to synchronous
8b, and 8c generators applying, specifically
(50 element the phase overcurrent relay 50
only)
element installed on generator‐
side of the GSU transformer
Generator step‐up transformer(s)
Option 11 connected to asynchronous
(50 element generators only (including
only)
inverter‐based installations)
applying, specifically the phase
Implementation Plan
Project 2016‐04 – Modifications to PRC‐025‐1
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 60
months after the effective date of Reliability
Standard PRC‐025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 84 months
after the effective date of Reliability Standard PRC‐
025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 60
months after the effective date of Reliability
Standard PRC‐025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 84 months
after the effective date of Reliability Standard PRC‐
025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 60
months after the effective date of Reliability
Standard PRC‐025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 84 months
after the effective date of Reliability Standard PRC‐
025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 60
months after the effective date of Reliability
Standard PRC‐025‐2
4
overcurrent 50 element –
installed on generator‐side of the
GSU transformer
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 84 months
after the effective date of Reliability Standard PRC‐
025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
Unit auxiliary transformer(s) (UAT) replacement or removal is not necessary, 60
applying, specifically the phase
months after the effective date of Reliability
Options 13a
overcurrent 50 element applied at Standard PRC‐025‐2
and 13b (50
the high‐side terminals of the
element
Where determined by the Generator Owner,
UAT, for which operation of the
only)
Transmission Owner, or Distribution Provider that
relay will cause the associated
replacement or removal is necessary, 84 months
generator to trip
after the effective date of Reliability Standard PRC‐
025‐2
Option 14b
Option 15b
Relays installed on the high‐side
of the GSU transformer, including
relays installed on the remote end
of line, for Elements that connect
the GSU transformer(s) to the
Transmission system that are used
exclusively to export energy
directly from a BES generating
unit or generating plant (except
that Elements may also supply
generating plant loads) –
connected to synchronous
generators applying a phase
distance relay (e.g., 21) –
directional toward the
Transmission system
Relays installed on the high‐side
of the GSU transformer, including
relays installed at the remote end
of the line, for Elements that
connect the GSU transformer(s) to
Implementation Plan
Project 2016‐04 – Modifications to PRC‐025‐1
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 24
months after the effective date of Reliability
Standard PRC‐025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 48 months
after the effective date of Reliability Standard PRC‐
025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 24
months after the effective date of Reliability
Standard PRC‐025‐2
5
the Transmission system that are
used exclusively to export energy
directly from a BES generating
unit or generating plant (except
that Elements may also supply
generating plant loads) –
connected to synchronous
generators applying a phase
instantaneous overcurrent
supervisory element (e.g., 50) –
associated with current‐based,
communication‐assisted schemes
where the scheme is capable of
tripping for loss of
communications and/or phase
time overcurrent relay (e.g., 51)
Option 16b
Relays installed on the high‐side
of the GSU transformer, including
relays installed at the remote end
of the line, for Elements that
connect the GSU transformer(s) to
the Transmission system that are
used exclusively to export energy
directly from a BES generating
unit or generating plant (except
that Elements may also supply
generating plant load.) –
connected to synchronous
generators applying Phase
directional instantaneous
overcurrent supervisory element
(e.g., 67) – associated with
current‐based, communication‐
assisted schemes where the
scheme is capable of tripping for
loss of communications
directional toward the
Transmission system and/or
phase directional time
overcurrent relay (e.g., 67) –
directional toward the
Transmission system
Implementation Plan
Project 2016‐04 – Modifications to PRC‐025‐1
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 48 months
after the effective date of Reliability Standard PRC‐
025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 24
months after the effective date of Reliability
Standard PRC‐025‐2
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 48 months
after the effective date of Reliability Standard PRC‐
025‐2
6
Load‐responsive protective relays which become applicable to the standard
Each Generator Owner, Transmission Owner, or Distribution Provider that owns load‐responsive
protective relays that become applicable to this standard, not because of the actions of itself including but
not limited to changes in NERC Registration Criteria or Bulk Electric System (BES) definition, shall not be
required to comply with Requirement R1 until the following dates:
Requirement
Applicability
R1
Each Generator Owner,
Transmission Owner, and
Distribution Provider shall
apply settings that are in
accordance with PRC‐025‐2
– Attachment 1: Relay
Settings, on each load‐
responsive protective relay
while maintaining reliable
fault protection.
Implementation Date
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is not necessary, 60 months
beyond the date the load‐responsive protective relays
become applicable to the standard
Where determined by the Generator Owner,
Transmission Owner, or Distribution Provider that
replacement or removal is necessary, 84 months beyond
the date the load‐responsive protective relays become
applicable to the standard
Retirement Date
PRC‐025‐1
Reliability Standard PRC‐025‐1 shall be retired immediately prior to the effective date of PRC‐025‐2 in the
particular jurisdiction in which the revised standard is becoming effective.
Phased-In Retirement
None
Implementation Plan for Definitions
No definitions are proposed as a part of this standard.
Implementation Plan
Project 2016‐04 – Modifications to PRC‐025‐1
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File Type | application/pdf |
Author | Courtney Baughan |
File Modified | 2018-07-09 |
File Created | 2018-02-13 |