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/

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