Insights into System Protection Working Group Updates and Misoperations
Gain valuable insights from the recent System Protection Working Group meeting updates, including discussions on misoperations in 2022 Q4 and key areas like compliance implementation, NERC activities, and more. Explore details on the misoperation rates and categories revealed in the session.
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Presentation Transcript
System Protection Working Group System Protection Working Group (SPWG) (SPWG) Update to ROS Update to ROS APRIL 6, 2023 APRIL 6, 2023 CHAIR: JON SNELLGROVE, P.E. CHAIR: JON SNELLGROVE, P.E. VICE CHAIR: ANDREW MATTEI, P.E. VICE CHAIR: ANDREW MATTEI, P.E.
SPWG Meeting Overview SPWG Meeting Overview 1st SPWG Meeting of 2023 was held on March 1st, 2023 Topics Discussed: Texas RE 2022 Q4 Misoperation Data (included) MIDAS Data Reporting Instructions (DRI) ERCOT Case Build Updates NERC SPCWG Activities PRC-019-2 still working of Compliance Implementation Guidance (CIG) PRC-023 SAR final draft passed PRC-002 SARs made it through initial pass, but some details are not covered yet PRC-002 Project 2021-04b next meeting on April 5th NOGRR247 Changes to UFLS Stages and Load Relief Amounts
Protection System Protection System Misoperations 2022 Q4 2022 Q4 Misoperations
Protection System Misoperations: 2017-2022 Q4 2022 Q4 Misoperation rate was 7.8%
Protection System Misoperations 2022 Q4 Q4 2022 YTD CAP Duration: 2017-Current 35.0% # of Misoperations Total 33 146 30.0% 345 kV 9 41 138 kV 22 94 25.0% < 100 kV 2 11 20.0% By Category Failure to Trip 1 10 15.0% Slow Trip 0 1 Unnecessary Trip during Fault 20 70 10.0% Unnecessary Trip Non Fault 12 65 5.0% RAS 0 0 0.0% By Relay System Type Electromechanical 2 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 # of Days Solid State 1 1 Duration of Corrective Action Plans Microprocessor 24 120 100.0 Avg CAP Duration Other/ N/A 6 20 90.0 By Equipment Protected Line 13 73 80.0 Transformer 3 21 70.0 60.0 Generator 9 21 50.0 Shunt/Series Capacitor 4 8 40.0 Shunt/Series Reactor 0 2 30.0 Dynamic VAR system 0 0 20.0 Bus 1 9 10.0 Breaker 3 9 0.0 Other 0 3 2017 2018 2019 2020 2021 2022
Human Performance - 2022 Q4 Summary of Human Performance Issues noted for 2022 Q4: - Generator tripped when syncing to the grid. PTs were wired C-B-A instead of A-B-C - 138kV line tripped for a remote fault due to carrier control switch in the Test position - 138kV line tripped for a remote fault due to incorrect settings on an overreaching ground element - 138kV line tripped for a remote fault due to multiple grounds in the CT secondary circuit - Generator tripped with normal load due to an instantaneous overcurrent element that was inadvertently enable Failure to Trip/Slow Trip Misoperations in 2022 Q4: - 138kV breaker failed to trip due to a failure of one of it s auxiliary contacts assemblies. The relaying schemes used breaker auxiliary contacts to supervise tripping. The failure of the contacts to correctly indicate that the breaker was open, when it was actually closed, prevented tripping of the breaker and required remote clearing of the fault.
End of SPWG Presentation End of SPWG Presentation Next Meeting Scheduled for July 19-20, 2023 Next ERCOT ROS Update will be Provided on August 3rd, 2023 Thank You Any Questions?
Definitions Protection System Protective relays which respond to electrical quantities, Communications systems necessary for correct operation of protective functions Voltage and current sensing devices providing inputs to protective relays, Station dc supply associated with protective functions (including station batteries, battery chargers, and non-battery-based dc supply), and Control circuitry associated with protective functions through the trip coil(s) of the circuit breakers or other interrupting devices
Definitions Composite Protection System - The total complement of Protection System(s) that function collectively to protect an Element. Backup protection provided by a different Element s Protection System(s) is excluded. Misoperation The failure a Composite Protection System to operate as intended for protection purposes. Any of the following is a Misoperation: 1. Failure to Trip During Fault A failure of a Composite Protection system to operate for a Fault condition for which it is designed. 2. Failure to Trip Other than Fault - A failure of a Composite Protection system to operate for a non-Fault condition for which it is designed, such as a power swing, undervoltage, overexcitation, or loss of excitation.
Definitions Misoperation The failure a Composite Protection System to operate as intended for protection purposes. Any of the following is a Misoperation: 3. Slow Trip During Fault A Composite Protection system that is slower than required for a Fault condition if the duration of its operating time resulted in the operation of at least one other Element s Composite Protection System. 4. Slow Trip Other than Fault - A Composite Protection system that is slower than required for a non-Fault condition, such as a power swing, undervoltage, overexcitation, or loss of excitation, if the duration of its operating time resulted in the operation of at least one other Element s Composite Protection System.
Definitions Misoperation The failure a Composite Protection System to operate as intended for protection purposes. Any of the following is a Misoperation: 5. Unnecessary Trip During Fault An unnecessary Composite Protection system operation for a Fault condition on another Element. 6. Unnecessary Trip Other than Fault - An unnecessary Composite Protection system operation for a non-Fault condition. A Composite Protection System operation that is caused by personnel during on-site maintenance, testing, inspection, construction, or commissioning activities is not a Misoperation.
