2. North American Electric Reliability Corporation
The electric reliability organization (ERO) for North America
Its mission is to assure the reliability of the bulk power system
in North America
Oversight by the Federal Energy Regulatory Commission (FERC)
Prior to August 2003 blackout, was only a standards body
Granted enforcement authority by the federal government as a
result of the 2003 blackout
2
What is NERC?
3. Keep transmission and generation on line when is supposed to
Make sure it trips off line when is supposed to
3
What is NERC?
4. 4
NERC Standards that we can assist with:
NERC Standard Description Done by CE?
PRC-001-1.1(ii) System Protection Coordination Yes
PRC-002 Disturbance Monitoring
PRC-002-NPCC-01 Disturbance Monitoring Yes
PRC-005-1.1b Transmission and Generation Protection System Maintenance and Testing Yes
PRC-005-2(i) Protection System Maintenance Yes
PRC-005-6 Protection System, Automatic Reclosing, and Sudden Pressure Relaying Yes
PRC-006-2 Automatic Under frequency Load Shedding Yes
PRC-006-NPCC-1 Automatic Under frequency Load Shedding Yes
PRC-008-0
Implementation and Documentation of Underfrequency Load Shedding Equipment
Maintenance Program
Yes
PRC-018-1 Disturbance Monitoring Equipment Installation and Data Reporting Yes
PRC-019-2
Coordination of Generating Unit or Plant Capabilities, Voltage Regulating Controls, and
Protection
Yes
PRC-023-3 Transmission Relay Loadability Yes
PRC-024-2 Generator Frequency and Voltage Protective Relay Settings Yes
PRC-025-1 Generator Relay Loadability Yes
PRC-026-1 Relay Performance During Stable Power Swings
PRC-027-1 Coordination of Protection Systems for Performance During Faults
5. 5
NERC Standards that we can assist with:
NERC Standard Description Done by CE?
VAR-001-4.1 Voltage and Reactive Control
VAR-002-4 Generator Operation for Maintaining Network Voltage Schedules
MOD-025-2
Verification and Data Reporting of Generator Real and Reactive Power Capability and
Synchronous Condenser Reactive Power Capability
MOD-026-1
Verification of Models and Data for Generator Excitation Control System or Plant
Volt/Var Control Functions
MOD-027-1
Verification of Models and Data for Turbine/Governor and Load Control or Active
Power/Frequency Control Functions
MOD-032-1 Data for Power System Modeling and Analysis
6. Description: Communicate Failures, changes in Protection and Control Schemes, or
changes in Operating Conditions to Affected Entities
Applies to: All entities in the BES
Required Info: Description of Failed Equipment
Description of Modified Equipment
Description of New Operating Conditions
Revised Protective Device Settings
Revised Fault Analysis (if applicable)
Enforcement Date: 5/29/2015
6
PRC-001-1: System Protection Coordination
7. Description: Installation of Sequence of Events, Digital Fault Recorders, and Dynamic
Disturbance Recorders to provide adequate data on system events to
facilitate the analysis of BES Disturbances
Applies to: GO’s with units >50MVA and Plants >300 MVA (Sequence of Events) and
Plants>200MVA connected to BES via a GSU (Digital Fault Recorder)
Required Info: System One-Line Diagram
List of All Protective Relays in path from Generator to BES Interconnection
List of All Circuit Breakers in path from Generator to BES Interconnection
Plant Layout Drawing showing locations of Relays and Breakers
Enforcement Date: 10/20/2013
7
PRC-002-NPCC-01: Disturbance Monitoring and Reporting Requirements
PRC-018-1: DisturbanceMonitoringEquipmentInstallationandDataReporting
8. Description: Installation of Sequence of Events, Digital Fault Recorders, and Dynamic Disturbance
Recorders to provide adequate data on system events to facilitate the analysis of
BES Disturbances
Applies to: Generator Operators connected to BES where the TO has notified them that they
need to provide Sequence of Events, Digital Fault Recorder, or a Dynamic Disturbance
Required Info: System One-Line Diagram
List of All Protective Relays (type, mfr) in path from Generator to BES Interconnection
List of All Circuit Breakers in path from Generator to BES Interconnection
Plant Layout Drawing showing locations of Relays and Breakers
Enforcement Date: 7/1/2013
8
PRC-002-2: Disturbance Monitoring and Reporting Requirements
PRC-018-1: DisturbanceMonitoringEquipmentInstallationandDataReporting
9. Description: To ensure all transmission and generation Protection Systems affecting
the reliability of the Bulk Electric System (BES) are maintained and tested
by having a documented Protection System maintenance and testing
program (PSMTP) and documented and dated test results
Applies to: All entities in the BES
Required Info: System Relay and Metering One-Line Diagrams
List of All Protective Relays (type, mfr) in path to BES
AC 3 line and DC schematic diagrams
Protective Relay Settings/Settings Files
Enforcement Date: 11/25/2013
9
PRC-005-1.1b: Transmission and Generation Protection
System Maintenance and Testing
10. Description: To ensure all transmission and generation Protection Systems affecting the reliability of the Bulk
Electric System (BES) are maintained and tested by having a documented Protection
System maintenance program (PSMP) and documented and dated test results
Applies to: All entities in the BES
Required Info: System Relay and Metering One-Line Diagrams
List of All Protective Relays (type, mfr) in path to BES
Relay Monitoring Systems
Battery and Charger Systems
AC 3 line and DC schematic diagrams
Original Protective Relay Settings and Current Settings
Enforcement Date: 5/29/15
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PRC-005-2(i): Protection System Maintenance
11. 11
PRC-005-6: Protection System, Automatic Reclosing, and
Sudden Pressure Relaying Maintenance
Description: To ensure all transmission and generation Protection Systems affecting the reliability of the Bulk
Electric System (BES) are maintained and tested by having a documented Protection
System maintenance program (PSMP) and documented and dated test results
Applies to: All entities in the BES
Required Info: System Relay and Metering One-Line Diagrams
List of All Protective Relays (type, mfr) in path to BES including Transformer Sudden Pressure Relays
Relay Monitoring Systems
Battery and Charger Systems
AC 3 line and DC schematic diagrams
Original Protective Relay Settings and Current Settings
Enforcement Date: 1/1/16
12. 12
PRC-005-2 Key Requirements
PSMP to define maintenance intervals as time based or performance based
Intervals for Time based Maintenance defined by type of relay (EM or Digital) and relay monitoring
Ranges from 6 to 12 years
Verify the that relays communications are functioning every 4 months if not monitored
Unmonitored Station Batteries
Verify dc voltage and electrolytes every 4 months
Verify charger, continuity, connection resistance every 18 months
Perform capacity test every 3-6 years depending on type of battery
CT/PT Verification Tests – verify that current & voltage inputs to the relays are providing expected quantities every 6
years for unmonitored relays and every 12 years if self diagnostics and alarming is monitored
Trip Tests – verify operation all breaker trips coils and lockout relays every 6 years, aux relays every 12 yrs
Alarm Monitoring – verify alarms are sent to a monitoring location where corrective action can be initiated within 24
hours
13. 13
PRC-006-2: Automatic Underfrequency Load Shedding
Description: To establish design and documentation requirements for automatic underfrequency
load shedding (UFLS) programs to arrest declining frequency, assist recovery of frequency
following underfrequency events and provide last resort system preservation measures.
Applies to: All entities in the BES (Generators > 20 MVA)
Required Info: Regional Planning Coordinator Requirements for UFLS scheme
List of All Protective Relays which will respond to system frequency excursions and initiate
UFLS scheme
Underfrequency limit curves for generating units and V/Hz curves for power transformers
AC 3 line and DC schematic diagrams
Original Protective Relay Settings and Current Settings
Enforcement Date: 10/1/2015
14. Description: Provide a regional reliability standard for automatic underfrequency load shedding
(UFLS) programs to preserve the security and integrity of the bulk power system
during declining system frequency events
Applies to: All entities in the BES
Required Info: Regional Planning Coordinator Requirements for UFLS scheme
List of All Protective Relays which will respond to system frequency excursions and
initiate UFLS scheme
Underfrequency limit curves for generating units
AC 3 line and DC schematic diagrams
Original Protective Relay Settings and Current Settings
Enforcement Date: 1/1/16
14
PRC-006-NPCC-1: Automatic Underfrequency Load Shedding
15. Description: This study reviews the facility’s generator excitation system(s) limiters and
protection settings for both coordination and proper protection.
Applies to: Generating units > 20MVA, synchronous condenser > 20MVA, plant with total
generation > 75MVA
Required Info: Generator specification sheet(s)
Step-up transformer nameplate/specification sheet(s)
System Impedance Data
Exciter system limiters and protection settings
Loss of field and Over excitation protections (if applicable)
Enforcement Date: 5/29/2015
15
PRC-019-02: Coordination of Generating Unit or Plant
Capabilities, Voltage Regulating Controls, and Protection
16. Description: This study reviews the facility’s line relays looking out to transmission to ensure
that loadability is not limited while still adequately protecting the line.
Applies to: TO’s, GO’s, and distribution providers with load-responsive phase protection
Required Info: System One-Line Diagram
Line relay setting(s)
Generator step-up transformer overcurrent protection relay setting(s)
Owned transmission line data
Reported MW capability to local ISO
Enforcement Date: 10/20/2013
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PRC-023-2: Transmission Relay Loadability
17. Description: This study reviews the facility’s over/under frequency and voltage set points to
avoid nuisance tripping during system (grid) events.
Applies to: GO’s having been notified of required compliance
Required Info: Plant under/over voltage relay settings
Plant under/over frequency relay settings
Enforcement Date: 3/20/2014
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PRC-024-1: Generator Frequency and Voltage Protection
Relay Settings
18. Description: This study reviews the facility’s generator protection settings to prevent
nuisance tripping during system (grid) events.
Applies to: GO’s having been notified of required compliance
Required Info: System One-Line Diagram
Plant generation and step-up transformer protection relay settings
Step-up transformer nameplate
Reported MW capability to local ISO
Enforcement Date: 7/17/2014
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PRC-025-1: Generator Relay Loadability
19. Description: Evaluating load-shed systems to ensure they do not cause nuisance
trips during stable power swings
Applies to: GO’s having been notified of required compliance
Required Info: System One-Line Diagram
Load Shedding Scheme Drawing Package
Generator and Step-Up Transformer Specification Sheet(s)
Enforcement Date: TBD
19
PRC-026-1: Relay Performance During Stable Power Swings
20. Description: Ensure protective devices are properly coordinated to ensure that
faults are isolated with minimal system load interruption
Applies to: GO’s, TO’s, and Distribution Providers with protection systems
installed for detecting and isolating faults on the bulk energy system
Required Info: System One-Line Diagram
All protective relay settings
Enforcement Date: 8/2015
20
PRC-027-1: Coordination of Protection System Performance
During Faults
21. Description: To ensure that voltage levels, reactive flows, and reactive resources
are monitored, controlled, and maintained within limits in Real-time to
protect equipment and the reliable operation of the Interconnection
Applies to: GO’s and TO’s having been notified of required compliance
Required Info: Voltage/reactive power monitoring and control system diagrams
Enforcement Date: 8/1/2014
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VAR-001-4: Voltage and Reactive Control
22. Description: To ensure generators provide reactive support and voltage control,
within generating Facility capabilities, in order to protect
equipment and maintain reliable operation of the Interconnection
Applies to: GO’s having been notified of required compliance
Required Info: System One-Line Diagram
Generator voltage control system set point(s) and specification(s)
Enforcement Date: v.03 - 8/1/2014; v.04 - TBD
22
VAR-002-4: Generator Operation for Maintaining Network
Voltage Schedules
23. Description: Verifies generator capability data, specifically real and reactive power capability.
This is a machine test and does not require protective device coordination in order
to successfully complete the test. Protective devices can be adjusted to allow for as
successful test.
Applies to: Generator Operators connected to BES with individual generating units greater
than 20 MVA or an aggregate generating capacity greater than 75 MVA
Required Info: Generator “D” Curve
Protective Device Coordination Data
Data Gathering Points
Plant One Line Diagram
Enforcement Date: 2/1/2016
23
MOD-025-2: Verification and Data Reporting of Generator
Real and Reactive Power Capability
24. Description: To verify that the generator excitation control system or plant volt/var control
function model (including the power system stabilizer model and the impedance
compensator model) and the model parameters used in dynamic simulations
accurately represent the generator excitation control system or plant volt/var control
function behavior
Applies to: Generator Operators connected to BES with individual generating units greater than
100 MVA (EIR)
Required Info: Detailed Excitation Controller Documentation
Detailed Volt/VAR Control System Documentation
DCS Monitoring Points List or Plant of Relay Protection Diagram
Plant Three-Line Diagram
Enforcement Date: 7/1/2014
24
MOD-026-1: Verification of Models and Data for Generator
Excitation Control System or Plant Volt/VAR Control Functions
25. Description: To verify that the turbine/governor and load control or active power/frequency
control model and the model parameters, used in dynamic simulations that assess
Bulk Electric System (BES) reliability, accurately represent generator unit real power
response to system frequency variations.
Applies to: Generator Operators connected to BES with individual generating units greater
than 100 MVA (EIR)
Required Info: Detailed Automatic Voltage Regulator or Governor Documentation
Load Control Programming and Documentation
System/Machine Limiter Setpoints and Documentation
Plant Relay Protection One-Line Diagram
Enforcement Date: 7/1/2014
25
MOD-027-1: Verification of Models and Data for Turbine/Governor and Load
Control or Active Power/Frequency Control Functions
26. Description: To establish consistent modeling data requirements and reporting
procedures for development of planning horizon cases necessary to
support analysis of the reliability of the interconnected transmission system.
Applies to: All entities in the BES
Required Info: All Machine Data
All Plant Impedance Data
All Line Impedance Data
All Transformer Data
System Component Data
Enforcement Date: 7/1/2015
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MOD-032-1: Data for Power System Modeling and Analysis
