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RC
- Reliability Coordinator
- NERC GLOSSARY
- The entity that is the highest level of authority who is responsible for the Reliable Operation of the Bulk Electric System, has the Wide Area view of the Bulk Electric System, and has the operating tools, processes and procedures, including the authority to prevent or mitigate emergency operating situations in both next-day analysis and real-time operations. The Reliability Coordinator has the purview that is broad enough to enable the calculation of Interconnection Reliability Operating Limits, which may be based on the operating parameters of transmission systems beyond any Transmission Operator’s vision.
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Reliability Standard
- NERC GLOSSARY
- A requirement, approved by the United States Federal Energy Regulatory Commission under Section 215 of the Federal Power Act, or approved or recognized by an applicable governmental authority in other jurisdictions, to provide for Reliable Operation of the Bulk-Power System. The term includes requirements for the operation of existing Bulk-Power System facilities, including cybersecurity protection, and the design of planned additions or modifications to such facilities to the extent necessary to provide for Reliable Operation of the Bulk-Power System, but the term does not include any requirement to enlarge such facilities or to construct new transmission capacity or generation capacity.
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RAS
- Remedial Action Scheme
- NERC GLOSSARY
- A scheme designed to detect predetermined System conditions and automatically take corrective actions that may include, but are not limited to, adjusting or tripping generation (MW and Mvar), tripping load, or reconfiguring a System(s). RAS accomplish objectives such as:
- - Meet requirements identified in the NERC Reliability Standards;
- - Maintain Bulk Electric System (BES) stability;
- - Maintain acceptable BES voltages;
- - Maintain acceptable BES power flows;
- - Limit the impact of Cascading or extreme events.
- The following do not individually constitute a RAS:
- - At least 14 elements are listed…
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Schedule
- NERC GLOSSARY
- (Verb) To set up a plan or arrangement for an Interchange Transaction.
- (Noun) An Interchange Schedule.
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Scheduled Frequency
- NERC GLOSSARY
- 60.0 Hertz, except during a time correction.
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NIS
- Scheduled Net Interchange (NIS)
- NERC GLOSSARY
- The algebraic sum of all scheduled megawatt transfers, including Dynamic Schedules, to and from all Adjacent Balancing Authority areas within the same Interconnection, including the effect of scheduled ramps. Scheduled megawatt transfers on asynchronous DC tie lines directly connected to another Interconnection are excluded from Scheduled Net Interchange.
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Sink Balancing Authority
- NERC GLOSSARY
- The Balancing Authority in which the load (sink) is located for an Interchange Transaction and any resulting Interchange Schedule.
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Source Balancing Authority
- NERC GLOSSARY
- The Balancing Authority in which the generation (source) is located for an Interchange Transaction and for any resulting Interchange Schedule.
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SOL
- System Operating Limit
- NERC GLOSSARY
- The value (such as MW, MVar, Amperes, Frequency or Volts) that satisfies the most limiting of the prescribed operating criteria for a specified system configuration to ensure operation within acceptable reliability criteria.
- System Operating Limits are based upon certain operating criteria. These include, but are not limited to:
- - Facility Ratings (Applicable pre- and post-Contingency equipment or facility ratings)
- - Transient Stability Ratings (Applicable pre- and post-Contingency Stability Limits)
- - Voltage Stability Ratings (Applicable pre- and post-Contingency Voltage Stability)
- - System Voltage Limits (Applicable pre- and post-Contingency Voltage Limits)
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System Operator
- NERC GLOSSARY
- An individual at a control center (Balancing Authority, Transmission Operator, Generator Operator, Reliability Coordinator) whose responsibility it is to monitor and control that electric system in real time.
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TOP
- Transmission Operator
- NERC GLOSSARY
- The entity responsible for the reliability of its “local” transmission system, and that operates or directs the operations of the transmission facilities.
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TO
- Transmission Owner
- NERC GLOSSARY
- The entity that owns and maintains transmission facilities.
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TP
- Transmission Planner
- NERC GLOSSARY
- The entity that develops a long-term (generally one year and beyond) plan for the reliability (adequacy) of the interconnected bulk electric transmission systems within its portion of the Planning Authority Area.
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TSP
- Transmission Service Provider
- NERC GLOSSARY
- The entity that administers the transmission tariff and provides Transmission Service to Transmission Customers under applicable transmission service agreements.
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