Proposed Rel. Std. PRC-005-1.1b (clarifying std. covered by FERC-725A)

Standard PRC-005-1.1b — Transmission and Generation Protection System Maintenance and
Testing

A. Introduction
1.

Title:

Transmission and Generation Protection System Maintenance and Testing

2.

Number:

PRC-005-1.1b

3.

Purpose:
To ensure all transmission and generation Protection Systems affecting the
reliability of the Bulk Electric System (BES) are maintained and tested.

4.

Applicability
4.1. Transmission Owner.
4.2. Generator Owner.
4.3. Distribution Provider that owns a transmission Protection System.

5.

Effective Date:
In those jurisdictions where regulatory approval is required, all
requirements become effective upon approval. In those jurisdictions where no regulatory
approval is required, all requirements become effective upon Board of Trustee’s adoption or as
otherwise made effective pursuant to the laws applicable to such ERO governmental
authorities.

B. Requirements
R1. Each Transmission Owner and any Distribution Provider that owns a transmission Protection
System and each Generator Owner that owns a generation or generator interconnection Facility
Protection System shall have a Protection System maintenance and testing program for
Protection Systems that affect the reliability of the BES. The program shall include:
R1.1.

Maintenance and testing intervals and their basis.

R1.2.

Summary of maintenance and testing procedures.

R2. Each Transmission Owner and any Distribution Provider that owns a transmission Protection
System and each Generator Owner that owns a generation or generator interconnection Facility
Protection System shall provide documentation of its Protection System maintenance and
testing program and the implementation of that program to its Regional Entity on request
(within 30 calendar days). The documentation of the program implementation shall include:
R2.1. Evidence Protection System devices were maintained and tested within the defined
intervals.
R2.2.

Date each Protection System device was last tested/maintained.

C. Measures
M1. Each Transmission Owner and any Distribution Provider that owns a transmission Protection
System and each Generator Owner that owns a generation or generator interconnection Facility
Protection System that affects the reliability of the BES, shall have an associated Protection
System maintenance and testing program as defined in Requirement 1.
M2. Each Transmission Owner and any Distribution Provider that owns a transmission Protection
System and each Generator Owner that owns a generation or generator interconnection Facility
Protection System that affects the reliability of the BES, shall have evidence it provided
documentation of its associated Protection System maintenance and testing program and the
implementation of its program as defined in Requirement 2.

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Standard PRC-005-1.1b — Transmission and Generation Protection System Maintenance and
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D. Compliance
1.

Compliance Monitoring Process
1.1. Compliance Monitoring Responsibility
Regional Entity.
1.2. Compliance Monitoring Period and Reset Time Frame
One calendar year.
1.3. Data Retention
The following evidence retention periods identify the period of time an entity is required
to retain specific evidence to demonstrate compliance. For instances where the evidence
retention period specified below is shorter than the time since the last audit, the
Compliance Enforcement Authority may ask an entity to provide other evidence to show
that it was compliant for the full time period since the last audit.
The Transmission Owner and any Distribution Provider that owns a transmission
Protection System and each Generator Owner that owns a generation or generator
interconnection Facility Protection System, shall retain evidence of the implementation of
its Protection System maintenance and testing program for three years.
The Compliance Monitor shall retain any audit data for three years.
1.4. Additional Compliance Information
The Transmission Owner and any Distribution Provider that owns a transmission
Protection System and the Generator Owner that owns a generation or generator
interconnection Facility Protection System, shall each demonstrate compliance through
self-certification or audit (periodic, as part of targeted monitoring or initiated by
complaint or event), as determined by the Compliance Monitor.

2.

Violation Severity Levels (no changes)

E. Regional Differences
None identified.
Version History
Version

Date

Action

Change Tracking

0

April 1, 2005

Effective Date

New

1

December 1,
2005

1. Changed incorrect use of certain
hyphens (-) to “en dash” (–) and “em
dash (—).”
2. Added “periods” to items where
appropriate.
3. Changed “Timeframe” to “Time Frame”
in item D, 1.2.

01/20/05

1a

February 17,
2011

Added Appendix 1 - Interpretation
regarding applicability of standard to
protection of radially connected

Project 2009-17
interpretation

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Standard PRC-005-1.1b — Transmission and Generation Protection System Maintenance and
Testing

transformers
1a

February 17,
2011

Adopted by Board of Trustees

1a

September 26,
2011

FERC Order issued approving interpretation
of R1 and R2 (FERC’s Order is effective as
of September 26, 2011)

1.1a

February 1,
2012

Errata change: Clarified inclusion of
generator interconnection Facility in
Generator Owner’s responsibility

Revision under Project
2010-07

1b

February 3,
2012

FERC Order issued approving
interpretation of R1, R1.1, and R1.2
(FERC’s Order dated March 14, 2012).
Updated version from 1a to 1b.

Project 2009-10
Interpretation

1.1b

April 23, 2012

Updated standard version to 1.1b to reflect
FERC approval of PRC-005-1b.

Revision under Project
2010-07

1.1b

May 9, 2012

Adopted by Board of Trustees

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Standard PRC-005-1.1b — Transmission and Generation Protection System Maintenance and
Testing

Appendix 1
Requirement Number and Text of Requirement
R1. Each Transmission Owner and any Distribution Provider that owns a transmission Protection
System and each Generator Owner that owns a generation Protection System shall have a
Protection System maintenance and testing program for Protection Systems that affect the
reliability of the BES. The program shall include:
R1.1. Maintenance and testing intervals and their basis.
R1.2. Summary of maintenance and testing procedures.
R2. Each Transmission Owner and any Distribution Provider that owns a transmission Protection
System and each Generator Owner that owns a generation Protection System shall provide
documentation of its Protection System maintenance and testing program and the
implementation of that program to its Regional Reliability Organization on request (within 30
calendar days). The documentation of the program implementation shall include:
R2.1 Evidence Protection System devices were maintained and tested within the defined intervals.
R2.2 Date each Protection System device was last tested/maintained.

Question:
Is protection for a radially-connected transformer protection system energized from the BES considered a
transmission Protection System subject to this standard?

Response:
The request for interpretation of PRC-005-1 Requirements R1 and R2 focuses on the applicability of the
term “transmission Protection System.” The NERC Glossary of Terms Used in Reliability Standards
contains a definition of “Protection System” but does not contain a definition of transmission Protection
System. In these two standards, use of the phrase transmission Protection System indicates that the
requirements using this phrase are applicable to any Protection System that is installed for the purpose of
detecting faults on transmission elements (lines, buses, transformers, etc.) identified as being included in
the Bulk Electric System (BES) and trips an interrupting device that interrupts current supplied directly
from the BES.
A Protection System for a radially connected transformer energized from the BES would be considered a
transmission Protection System and subject to these standards only if the protection trips an interrupting
device that interrupts current supplied directly from the BES and the transformer is a BES element.

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Standard PRC-005-1.1b — Transmission and Generation Protection System Maintenance and
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Appendix 2
Requirement Number and Text of Requirement
R1.

Each Transmission Owner and any Distribution Provider that owns a transmission Protection
System and each Generator Owner that owns a generation Protection System shall have a
Protection System maintenance and testing program for Protection Systems that affect the
reliability of the BES. The program shall include:
R1.1. Maintenance and testing intervals and their basis.
R1.2. Summary of maintenance and testing procedures.

Question:
1. Does R1 require a maintenance and testing program for the battery chargers for the “station batteries”
that are considered part of the Protection System?
2. Does R1 require a maintenance and testing program for auxiliary relays and sensing devices? If so,
what types of auxiliary relays and sensing devices? (i.e transformer sudden pressure relays)
3. Does R1 require maintenance and testing of transmission line re-closing relays?
4. Does R1 require a maintenance and testing program for the DC circuitry that is just the circuitry with
relays and devices that control actions on breakers, etc., or does R1 require a program for the entire
circuit from the battery charger to the relays to circuit breakers and all associated wiring?
5. For R1, what are examples of "associated communications systems" that are part of “Protection
Systems” that require a maintenance and testing program?

Response:
1. While battery chargers are vital for ensuring “station batteries” are available to support Protection
System functions, they are not identified within the definition of “Protection Systems.” Therefore,
PRC-005-1 does not require maintenance and testing of battery chargers.
2. The existing definition of “Protection System” does not include auxiliary relays; therefore,
maintenance and testing of such devices is not explicitly required. Maintenance and testing of such
devices is addressed to the degree that an entity’s maintenance and testing program for 3 DC control
circuits involves maintenance and testing of imbedded auxiliary relays. Maintenance and testing of
devices that respond to quantities other than electrical quantities (for example, sudden pressure
relays) are not included within Requirement R1.
3. No. “Protective Relays” refer to devices that detect and take action for abnormal conditions.
Automatic restoration of transmission lines is not a “protective” function.
4. PRC-005-1 requires that entities 1) address DC control circuitry within their program, 2) have a basis
for the way they address this item, and 3) execute the program. PRC-005-1 does not establish specific
additional requirements relative to the scope and/or methods included within the program.
5. “Associated communication systems” refer to communication systems used to convey essential
Protection System tripping logic, sometimes referred to as pilot relaying or teleprotection. Examples
include the following:
•

communications equipment involved in power-line-carrier relaying

•

communications equipment involved in various types of permissive protection system
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Standard PRC-005-1.1b — Transmission and Generation Protection System Maintenance and
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applications
•

direct transfer-trip systems

•

digital communication systems (which would include the protection system communications
functions of standard IEC 618501 as well as various proprietary systems)

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* FOR INFORMATIONAL PURPOSES ONLY *
Enforcement Dates: Standard PRC-005-1.1b — Transmission and Generation Protection System
Maintenance and Testing
United States
Standard

Requirement

PRC-005-1.1b

All

Enforcement Date

Inactive Date

This standard has not yet been approved by the applicable regulatory authority.

Printed On: August 30, 2013, 11:11 AM