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FRCC System Protection Outage Procedure Rev 1

FRCC System Protection Outage Procedure Rev 1. Objectives. Know the applicable NERC Standards for Protection System Outages Know the changes to the FRCC System Protection Outage Procedure Know and apply the procedure for planned Protection System Outages

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FRCC System Protection Outage Procedure Rev 1

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  1. FRCC System Protection Outage Procedure Rev 1

  2. Objectives • Know the applicable NERC Standards for Protection System Outages • Know the changes to the FRCC System Protection Outage Procedure • Know and apply the procedure for plannedProtection System Outages • Know and apply the procedure for unplanned outages or failures of Protection Systems

  3. NERC Standard PRC-001-1.1 • Purpose: To ensure protection is coordinated among operating entities. • Applicability: BA’s, TOP’s, GOP’s • Effective Date: January 1, 2007

  4. NERC Standard PRC-001-1.1 • R2. Each GOP and TOP shall notify reliability entities of relay or equipment failures as follows: • R2.1. If a protective relay or equipment failure reduces system reliability, the GOP shall notify its TOP and Host Balancing Authority. The GOP shall take corrective action as soon as possible. • R2.2. If a protective relay or equipment failure reduces system reliability, the TOP shall notify its Reliability Coordinator and affected TOPs and BAs. The TOP shall take corrective action as soon as possible.

  5. System Protection Outage Procedure • Current Document Layout • Procedure • A. Purpose • B. Applicability • C. Requirements • From PRC-001 • D. Review Cycle • E. References • Appendix A • Procedure for Planned and Unplanned Outages. • Appendix B: Definitions

  6. System Protection Outage Procedure • New Document Layout • Procedure • Attachment A:Procedure for Planned Outages • Attachment B: Procedure for Unplanned Outages • Attachment C: BES Risk Assessment Worksheet • Attachment D: BES Risk Assessment Flow Chart

  7. System Protection Outage Procedure Purpose: • Ensure Protection System (as defined by NERC) outages that may reduce reliability of the FRCC Bulk Electric System (BES) are identified and communicated amongst operating entities

  8. Definition References From NERC Glossary: • Protection System • Protective relays which respond to electrical quantities • Comm systems necessary for correct operation of protective functions • Voltage and current sensing devices providing inputs to protective relaying • Station dc supply associated with protective functions • Control circuitry associated with protective functions through the trip coil(s)

  9. Definition References • Primary Protection: First-choice relay protection in contrast with backup relay protection. • Backup Protection: A form of protection that operates independently of specified components in the primary protective system. It may duplicate the primary protection or may be intended to operate only if the primary protection fails or is temporarily out of service.

  10. Definition References • Redundancy: The quality of a relaying system that allows a function to operate correctly, without degradation, irrespective of the failure or state of one portion, since another portion performs the same function (not to be confused with backup).

  11. Attachment A Procedure for Planned FRCC Protection System Outages with Monitored Facility Remaining in Service

  12. Planned Protection System Outages Identification: • System protection personnel (TO or GO) shall inform their TOP or GOP when they are planning outages of Protection Systems with the associated facility remaining in-service and when one of the following conditions is met: • The Protection System outage is associated with a BES component. • The protection system outage could impact BES reliability. • Any protection system outages resulting in increased clearing time on BES facilities for any faults. • The potential for cascading outages or wide area load loss. • A fault within the zone of protection that causes multiple BES elements to trip. • The potential for BES elements to “Over-Trip”.

  13. Planned Protection System Outages Condition Assessment: • Any planned maintenance outage that meets these guidelines will require a condition assessment of the remaining protection that would be relied on to clear a potential fault. • a physical verification that the remaining protection is in service. • a check that settings calculations for the remaining protection are appropriately coordinated. • a check that the remaining protection has been maintained and tested within the maintenance and testing interval of the maintenance program. • a check that the Carrier blocking cut out switch is in the correct position for the given situation.

  14. Planned Protection System Outages BES Risk Assessment: • Every GOP and/or TOP that is planning a transmission Protection System outage shall make an assessment of the risk to the FRCC Bulk Electric System (BES). • Outage duration < 72 hours: assume remaining protection systems are in service. • Outage duration > 72 hours: assume the next protection system expected to clear a fault is failed.

  15. Planned Protection System Outages BES Risk Assessment: • Breakers that are expected to trip and clearing time for remaining protection. • Additional BES elements that may “over-trip”. • Potential for cascading outages on the BES or wide-area load loss. • Attachment C is provided to assist in gathering the appropriate information. It is not mandatory to use this form.

  16. Planned Protection System Outages Attachment C: BES Risk Assessment Form STEP 1: Substation Name: ________________ Date & Duration of Outage: _________________ Protection System(s) to be Disabled: ________________________________________ Equipment Protected: ____________________________________________________ What Type of Scheme is this: DCB Line Diff Other:_________________ Will a Scheme with Equivalent (or faster) Clearing Times Remain in Service? Y N * If yes, which scheme will remain in service that is equivalent to the scheme being disabled? ______________________________________ Comments: _______________________________________________________________________________________________________________________________________________________________________________________________________________ Relay Technician: ____________________ Date: _____________ * If a scheme with equivalent (or faster) clearing time remains in service and outage is estimated to be less than 72 hours in duration, then no further analysis is needed.

  17. Planned Protection System Outages Attachment C: BES Risk Assessment Form STEP 2: The next fastest Protection System must be assumed to be disabled for Protection System outages that are estimated to be greater than 72 hours in duration. For a faulton the equipment while the protection is disabled, which breaker(s) will trip? Breaker # Station Relay (Diff, Line) Clearing Time  P&C Engineer: __________________ Date: ________________

  18. Planned Protection System Outages Attachment C: BES Risk Assessment Form STEP 3: Additional analysis (steady state or dynamic studies) may be needed by the TOP or GOP to answer the following questions. 1. Could this protection outage cause cascading outages or wide-area load loss? 2. Could this protection outage directly impact generation output? 3. Is it possible for multiple facilities to trip for a single contingency? If yes, define all the possible multiple contingencies to be evaluated by the Reliability Coordinator.

  19. Planned Protection System Outages Notification (New Requirements): The responsible TOP or GOP shall notify all directly connected TOP or GOP for the outage of any Protection System directly associated with an interconnected facility (tie lines or any other jointly owned facility) so that affected parties may coordinate to perform a BES Risk Assessment.  This notification should occur at least two weeks prior to the planned outage.

  20. Planned Protection System Outages Notification (New Requirements): Each FRCC TOP shall notify the FRCC RC and any affected parties identified in the BES Risk Assessment: • When multiple BES Elements will trip for a single contingency. • For the outage of any transmission Protection System that could reduce BES reliability as identified by the TOP. The TOP should provide the FRCC RC, the FRCC OPC and the FRCCNext Day Planner with the necessary information regarding the Protection System outage as outlined in the procedure. This notification should occur one week prior to the planned outage.  

  21. Planned Protection System Outages OPC and Next Day Planner Actions (New Requirements): • In their applicable studies, The FRCC OPC and Next Day Planner shall perform a steady state power flow and contingency analysis study with the affected facilities (lines, busses, generators, transformers, load, etc.) that are expected to trip based on the BES risk assessment provided by the TOPs. • If the study indicates the potential for cascading outages on the BES or wide-area load loss, the impact must be mitigated or the Facility must be taken out of service.

  22. Planned Protection System Outages RC Actions (New Requirements): • Prior to approving a Protection System outage, The FRCC RC shall perform a steady state power flow and contingency analysis study with the affected facilities (lines, busses, generators, transformers, load, etc.) that are expected to trip based on the BES risk assessment provided by the TOPs. • If the study indicates the potential for cascading outages on the BES or wide-area load loss, the impact must be mitigated or the Facility must be taken out of service.

  23. Attachment B Procedure for Unplanned FRCC Protection System Outages or Failures

  24. Unplanned Protection System Outages or Failures Identification: • System protection personnel (TO or GO) shall inform their TOP or GOP of any unplanned protection system outages or failures when one of the following conditions is met: • The outage or failure of any Protection System associated with a BES component. • Any protection system outage or failure that could impact BES reliability. • Any protection system outages resulting in increased clearing time on BES facilities for any faults. • The potential for cascading outages or wide area load loss. • A fault within the zone of protection that causes multiple BES elements to trip. • The potential for BES elements to “Over-Trip”.

  25. Unplanned Protection System Outages or Failures Condition Assessment: • Any outage or failure that meets these guidelines will require a condition assessment of the remaining protection that would be relied on to clear a potential fault. • a physical verification that the remaining protection is in service. • a check that settings calculations for the remaining protection are appropriately coordinated. • a check that the remaining protection has been maintained and tested within the maintenance and testing interval of the maintenance program. • a check that the Carrier blocking cut out switch is in the correct position for the given situation.

  26. Unplanned Protection System Outages or Failures GOP and TOP Actions: Under No Circumstancesshall a Facility remain in service without any Protection Systems in service.

  27. Unplanned Protection System Outages or Failures GOP and TOP Actions (from PRC-001): • Every GOP shall notify their host TOPupon being informed of an unplanned Protection System outage or failure. • Every TOP shall notify the FRCC RC upon being informed of an unplanned Protection System outage or failure unless a redundant Protection System remains in service.

  28. Unplanned Protection System Outages or Failures GOP and TOP Actions: • Within 30 minutes of being notified of a Protection System outage or failure, the TOP or GOP shall remove the facility monitored by the failed Protection System from service unless: • The Protection System Outage is not on the Primary Protection. • A redundant protection system remains in service. • A system study has been performed that simulates a fault on the facility with the protection system outage or failure and the study determines that there will be no cascading outages or wide area load loss. • Removing the monitored element will result in thermal overloads, an under-voltage condition, or cascading outages. These issues must be resolved as soon as possible so that the facility monitored by the failed Protection System can be removed from service.

  29. Unplanned Protection System Outages or Failures GOP and TOP Actions: If the facility must remain in service with a reduced level of protection while the unplanned Protection System outage or failure is being addressed: • the TOP or GOP should perform the condition assessment as soon as practical, placing an emphasis on the physical check of the remaining protection. • If the Protection System outage or failure could last for more than 72 hours and the facility is in service, the TOP or GOP must perform the BES Risk Assessment prior to the Protection System outage or failure exceeding 72 hours.

  30. Unplanned Protection System Outages or Failures GOP and TOP Actions: • If the monitored facility is removed from service, • The TOP or GOP should perform a BES Risk Assessment. This will provide the FRCC RC and the TOP valuable information in the event the facility must be returned to service for a system emergency. • The facility can be returned to service (with the Protection System outage or failure) for any of the following conditions: • A BES Risk Assessment determines that the Protection System outage or failure causes no reliability concerns. • An alternate remediation has been implemented to alleviate the reliability concern discovered in the BES Risk Assessment.

  31. Unplanned Protection System Outages or Failures RC Actions (New Requirement): • In the event that the monitored facility must be placed in service with the Protection System still in an outage, the FRCC RC shall perform a steady state power flow and contingency analysis study with the affected facilities (lines, busses, generators, transformers, load, etc.) that are expected to trip. • If the study indicates the potential for cascading outages on the BES or wide-area load loss, the impact must be mitigated or the Facility must be taken out of service.

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