Transmission Constraint
A limitation on one or more transmission elements that may be reached during normal or contingency system operations.
- Active Standards
- BAL
- BAL-001-2 – Real Power Balancing Control Performance
- BAL-001-TRE-1: Primary Frequency Response in the ERCOT Region
- BAL-001-TRE-2 – Primary Frequency Response in the ERCOT Region
- BAL-002-3: Disturbance Control Standard – Contingency Reserve for Recovery from a Balancing Contingency Even
- BAL-002-WECC-2a — Contingency Reserve
- BAL-003-1.1 – Frequency Response and Frequency Bias Setting
- BAL-003-2 – Frequency Response and Frequency Bias Setting
- BAL-004-WECC-3: Automatic Time Error Correction
- BAL-005-1: Balancing Authority Control
- BAL-502-RF-03: Planning Resource Adequacy Analysis, Assessment and Documentation
- CIP
- CIP-002-5.1a – Cyber Security – BES Cyber System Categorization
- CIP-003-6 – Cyber Security – Security Management Controls
- CIP-003-8 – Cyber Security — Security Management Controls
- CIP-004-6 – Cyber Security – Personnel & Training
- CIP-005-5 – Cyber Security — Electronic Security Perimeter(s)
- CIP-005-6 — Cyber Security – Electronic Security Perimeter(s)
- CIP-006-6 – Cyber Security – Physical Security of BES Cyber Systems
- CIP-007-6 – Cyber Security – System Security Management
- CIP-008-5 – Cyber Security – Incident Reporting and Response Planning
- CIP-008-6 — Cyber Security — Incident Reporting and Response Planning
- CIP-009-6 – Cyber Security – Recovery Plans for BES Cyber Systems
- CIP-010-2 – Cyber Security – Configuration Change Management and Vulnerability Assessments
- CIP-010-3 – Cyber Security — Configuration Change Management and Vulnerability Assessments
- CIP-011-2 – Cyber Security – Information Protection
- CIP-013-1 – Cyber Security – Supply Chain Risk Management
- CIP-014-2: Physical Security
- COM
- EOP
- FAC
- FAC-001-3 – Facility Interconnection Requirements
- FAC-002-2 – Facility Interconnection Studies
- FAC-002-3 – Facility Interconnection Studies
- FAC-002-3 — Facility Interconnection Studies
- FAC-003-4 – Transmission Vegetation Management
- FAC-008-3: Facility Ratings
- FAC-010-3 – System Operating Limits Methodology for the Planning Horizon
- FAC-011-3 – System Operating Limits Methodology for the Operations Horizon
- FAC-013-2: Assessment of Transfer Capability for the Near-term Transmission Planning Horizon
- FAC-014-2: Establish and Communicate System Operating Limits
- FAC-501-WECC-1: Transmission Maintenance
- FAC-501-WECC-2: Transmission Maintenance
- INT
- INT-001-3: Interchange Information
- INT-003-3: Interchange Transaction Implementation
- INT-004-2: Dynamic Interchange Transaction Modifications
- INT-004-3.1: Dynamic Transfers
- INT-005-3: Interchange Authority Distributes Arranged Interchange
- INT-006-3: Response to Interchange Authority
- INT-006-4: Evaluation of Interchange Transactions
- INT-006-5 – Evaluation of Interchange Transactions
- INT-006-5 – Evaluation of Interchange Transactions
- INT-007-1: Interchange Confirmation
- INT-008-3: Interchange Authority Dis tributes Status
- INT-009-1: Implementation of Interchange
- INT-009-2.1: Implementation of Interchange
- INT-010-1: Interchange Coordination Exemptions
- INT-010-2.1: Interchange Initiation and Modification for Reliability
- INT‐009‐3 — Implementation of Interchange
- IRO
- IRO-001-4: Reliability Coordination – Responsibilities
- IRO-002-6 – Reliability Coordination – Monitoring and Analysis
- IRO-006-5: Reliability Coordination — Transmission Loading Relief
- IRO-006-EAST-2: Transmission Loading Relief Procedure for the Eastern Interconnection
- IRO-006-WECC-2: Qualified Transfer Path Unscheduled Flow (USF) Relief
- IRO-006-WECC-3: Qualified Path Unscheduled Flow (USF) Relief
- IRO-008-2 – Reliability Coordinator Operational Analyses and Real-time Assessments
- IRO-009-2 – Reliability Coordinator Actions to Operate Within IROLs
- IRO-010-2 – Reliability Coordinator Data Specification and Collection
- IRO-010-3 — Reliability Coordinator Data Specification and Collection
- IRO-014-3 – Coordination Among Reliability Coordinators
- IRO-017-1: Outage Coordination
- IRO-018-1(i): Reliability Coordinator Real-time Reliability Monitoring and Analysis Capabilities
- IRO‐002‐7 ‐ Reliability Coordination ‐ Monitoring and Analysis
- MOD
- MOD-001-1a: Available Transmission System Capability
- MOD-004-1: Capacity Benefit Margin
- MOD-008-1: TRM Calculation Methodology
- MOD-020-0: Providing Interruptible Demands and DCLM Data
- 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-028-2: Area Interchange Methodology
- MOD-029-2a: Rated System Path Methodology
- MOD-030-3: Flowgate Methodology
- MOD-031-2: Demand and Energy Data
- MOD-031-3 — Demand and Energy Data
- MOD-032-1: Data for Power System Modeling and Analysis
- MOD-033-1: Steady-State and Dynamic System Model Validation
- MOD-033-2 — Steady-State and Dynamic System Model Validation
- NUC
- PER
- PRC
- PRC-001-1.1 (ii): System Protection Coordination
- PRC-002-2: Disturbance Monitoring and Reporting Requirements
- PRC-004-5(i): Protection System Misoperation Identification and Correction
- PRC-004-WECC-2: Protection System and Remedial Action Scheme Misoperation
- PRC-005-1.1b: Transmission and Generation Protection System Maintenance and Testing
- PRC-005-6: Protection System, Automatic Reclosing, and Sudden Pressure Relaying Maintenance
- PRC-006-3: Automatic Underfrequency Load Shedding
- PRC-006-5 — Automatic Underfrequency Load Shedding
- PRC-006-NPCC-1: Automatic Underfrequency Load Shedding
- PRC-006-NPCC-2 – Automatic Underfrequency Load Shedding
- PRC-006-SERC-02:Automatic Underfrequency Load Shedding Requirements
- PRC-008-0: Underfrequency Load Shedding Equipment Maintenance Programs
- PRC-010-2: Undervoltage Load Shedding
- PRC-011-0: UVLS System Maintenance and Testing
- PRC-012-2 – Remedial Action Schemes
- PRC-015-1: Remedial Action Scheme Data and Documentation
- PRC-016-1: Remedial Action Scheme Misoperations
- PRC-017-1: Remedial Action Scheme Maintenance and Testing
- PRC-018-1: Disturbance Monitoring Equipment Installation and Data Reporting
- PRC-019-2: Coordination of Generating Unit or Plant Capabilities, Voltage Regulating Controls, and Protection
- PRC-023-3: Transmission Relay Loadability
- PRC-023-4: Transmission Relay Loadability
- PRC-024-2: Generator Frequency and Voltage Protective Relay Settings
- PRC-025-1: Generator Relay Loadability
- PRC-025-2: Generator Relay Loadability
- PRC-026-1: Relay Performance During Stable Power Swings
- PRC-027-1 — Coordination of Protection Systems for Performance During Faults
- PRC‐004‐6 — Protection System Misoperation Identification and Correction
- TOP
- TPL
- VAR
- Glossary