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Curtis Crews, Reliability ServicesTexas Reliability Entity, Inc.
Changes in Relay Misoperations Reporting
2
Highlights
● Changes● Why Change?● How to Change?
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Changes
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History of Proposed Changes
● Result of NERC Reliability Metrics Working Group (RMWG), ERO-Reliability Assessments and Performance Analysis Group (ERO-RAPA), discussions
● Coordinated with Reliability Assessment Subcommittee (RAS), System Protection and Control Subcommittee (SPCS), Transmission Availability Data System Working Group (TADSWG), Transmission Availability Data System Regional Entity Coordinators (TADS-REC)
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Adequate Levels of Reliability(ALRs defined by RMWG)
● ALR4-1 Automatic Transmission Outages (ATO) Caused by Protection System Misoperations
● ALR6-11 ATO initiated by Failed Protection System
● ALR6-12 ATO initiated by Human Error● ALR6-13 ATO initiated by Failed AC Substation
Equipment● ALR6-14 ATO initiated by Failed AC Circuit
Equipment
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ERO-RAPA Key Function
● Develop a plan and an enterprise approach to data collection, checking, validation and assessment for use throughout NERC and the eight Regional Entities.
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Transmission Availability Data System(TADS)
● System change required to capture misoperation data
● Expansion of data required (TADS reports >200kV)
● Communication issues with TADS responsible entity and Relay Misoperation responsible entity
● TADS personnel are not Relay personnel
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How to change?
● NERC Standard change● NERC Rules of Procedure Section 1600
Request● Change TADS● Regional procedures
● First 3 options determined to be a more extended timeframe
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0
50
100
150
200
250
2006 2007 2008 2009 2010
Total Misoperations vs. Year
020406080
100120140160180200
2006 2007 2008 2009 2010
Misoperations vs. Year345 kV 138 kV
0.00%
2.00%
4.00%
6.00%
8.00%
10.00%
12.00%
14.00%
2006 2007 2008 2009 2010
% Misoperation vs. Year345 kV 138 kV
Misoperations “Trend”
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26%
24%
10%
22%
17%
Relay Settings
Implementation (Wiring errors,etc.)
Relay Failure
Pilot
Other
Per TADS Definitions:50% of 2009 misoperations attributable to Human Error
Summary of 2009 Misoperations - Cause
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Summary of 2010 Misoperations - Cause
37%
22%
9%
23%
10%
Relay Settings
Implementation (Wiringerrors, etc.)
Relay Failure
Pilot
Other
Per TADS Definitions:59% of 2010 misoperations attributable to Human Error
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References
● NERC Reliability Metrics Working Grouphttp://www.nerc.com/filez/rmwg.html
● NERC ERO Reliability Assessments and Performance Analysis Grouphttp://www.nerc.com/filez/ero-rapa.html
● NERC System Protection and Control Subcommitteehttp://www.nerc.com/filez/spctf.html
● ERCOT System Protection Working Grouphttp://www.ercot.com/committees/board/tac/ros/spwg/
● ERCOT Operating Guideshttp://www.ercot.com/mktrules/guides/operating/
ERCOT ROS November 11, 2010
