Transmission System Protection Misoperations Analysis
Explore the comprehensive review of protection system misoperations in the electric transmission system. The analysis covers misoperation rates, categories, equipment types, and voltages, providing insights for improved system reliability and performance.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
System Protection Working Group (SPWG) Update to ROS February, 2019 Genardo T. Corpuz, P.E.
SPWG Meeting No meeting in January 2019 Next meeting will be held March 5-6, 2019 2019 SPWG Chair: Micheal A. Davis, Jr, P.E. CenterPoint Energy | Supervising Engineer | Transmission Planning - System Modeling 2019 SPWG Vice-Chair: ?
Transmission Operator Protection System Misoperations 2018 Q3 ERCOT Protection System Misoperations Data 138kV and 345kV Combined % Misoperation Rate Overall 345kV 138kV 4 per. Mov. Avg. (Overall) 14.0% 12.0% 10.0% 8.0% 6.0% 4.0% 2.0% 0.0% 2011 Q1 2011 Q2 2011 Q3 2011 Q4 2012 Q1 2012 Q2 2012 Q3 2012 Q4 2013 Q1 2013 Q2 2013 Q3 2013 Q4 2014 Q1 2014 Q2 2014 Q3 2014 Q4 2015 Q1 2015 Q2 2015 Q3 2015 Q4 2016 Q1 2016 Q2 2016 Q3 2016 Q4 2017 Q1 2017 Q2 2017 Q3 2017 Q4 2018 Q1 2018 Q2 2018 Q3
Misop Rates by Region 18% 16% 14% 12% 10% 8% 6% 4% 2% 0% FRCC MRO NPCC RF SERC TRE WECC NERC 2013 Q4 - 2014 Q3 2014 Q4 - 2015 Q3 2015 Q4 - 2016 Q3 2016 Q4 - 2017 Q3 2017 Q4 - 2018 Q3
Protection System Misoperations 2018 Q3 Q3 YTD # of Misoperations Total 40 136 345 kV 13 45 138 kV 25 87 < 100 kV 2 4 By Category Failure to Trip 0 4 Slow Trip 0 4 Unnecessary Trip during Fault 21 71 Unnecessary Trip Non Fault 19 56 SPS 0 0 By Relay System Type Electromechanical 4 14 Solid State 2 5 Microprocessor 29 100 Other/ N/A 5 17 By Equipment Protected Line 20 62 Transformer 8 23 Generator 2 11 Shunt/Series Capacitor 2 2 Shunt/Series Reactor 1 6 Dynamic VAR system 0 0 Bus 2 6 Breaker 5 25
Protection System Misoperations 2018 Q3 <100 (Bulk Electric System Elements Only) 3% By Voltage 138 64% 345 33%
Protection System Misoperations 2018 Q3 By Category Failure to Trip - During Fault 2% 2% Failure to Trip - Other than Fault 41% 2% 1% Slow trip - During Fault Slow trip - Other than Fault Unnecessary Trip - During Fault Unnecessary Trip - Other than Fault 52%
Protection System Misoperations 2018 Q3 By Relay System Type 10% 12% 4% Electromechanical Solid State Microprocessor N/A 74%
Protection System Misoperations 2018 Q3 By Equipment Protected 19% Line Transformer 46% Generator 0% Shunt Capacitor 4% Bus 4% Shunt Reactor/Inductor 2% Dynamic Var Systems Breaker 8% 17%
Protection System Misoperations 2018 Q3 By Cause AC system As-left personnel error 12% 4% 17% Communication failures 8% DC system Incorrect settings 10% 10% Logic errors 1% 9% Design errors Relay failures/malfunctions 29% Unknown/unexplainable
Protection System Misoperations 2018 Q3 Human Performance Issues 138kV line overtripped during a fault. A mistake was identified with the panel wiring drawing from a recent panel upgrade project. 138kV line overtripped during a fault due to the carrier communication switch being left in the OFF position. Two 138kV lines overtripped during a fault due to incorrect calculation of settings. It was found that the lines were modeled incorrectly during the development of the settings.
ERCOT SPWG Procedure Revision 6. Reporting of Protective Relay System Misoperations Reporting of protective relay system misoperations shall be submitted per Regional Entity procedures NERC Section 1600 Data Request and ERCOT Nodal Operating Guide Section 6. Protective relay system misoperations shall be reported in the format requested by the Regional Entity. The submitted data shall include all applicable protective relay system misoperations occurring on Resource Systems and at Transmission Facilities 100 kV and above.
