Event Update Fourth Quarter 2012
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February 26, 2013Board of Directors Meeting
Event UpdateFourth Quarter 2012
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4th Quarter 2012 Events
4th Quarter 2012 Event and Compliance Monitoring Report
23
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Events - 4th Qtr
Cat 0
Cat 1
Cat 2
Cat 3
Cat 4
4% 4%4%
88%
Event Cause - 4th Qtr
Equipment Failure
Sabotage
Cyber Security
Weather
Relaying Issues
Unit Trips > 450 MW (Mult. Causes)
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2012 Events
4th Quarter 2012 Event and Compliance Monitoring Report
81
24
1
2012 Events
Cat 0
Cat 1
Cat 2
Cat 3
Cat 4
2% 2% 1%6%
2%
86%
2012 Event CausesEquipment Failure
Sabotage
Cyber Security
Weather
Relaying Issues
Unit Trips > 450 MW (Mult. Causes)
![Page 4: Event Update Fourth Quarter 2012](https://reader036.fdocuments.net/reader036/viewer/2022082818/5681328d550346895d992526/html5/thumbnails/4.jpg)
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NERC Event Category Examples
4th Quarter 2012 Event and Compliance Monitoring Report
● Category 1 - unexpected loss of 3 or more BPS elements contrary to design; failure or misoperation of SPS/RAS; unplanned evacuation from BPS control center facility with BPS SCADA for 30 minutes or more; loss of generation of 1000-1300 MW in ERCOT Interconnection; etc.*
● Category 2 - loss of all BPS control center voice or SCADA, control, or monitoring functionality for 30 minutes or more; unintended loss of 300 MW or more firm load for > 15 minutes; loss of off-site power to nuclear generating station, violation of IROL for > Tv; unintended system separation resulting in island of 1000-4999 MW, etc.*
● Category 3 - loss of 1,400 MW or more in ERCOT Interconnection or unintended system separation resulting in an island of 5,000 MW to 10,000 MW*
● Category 4 - loss of load or generation from 5,001 MW to 9,999 MW, or unintended separation resulting in an island of more than 10,000 MW*
● Category 5 - loss of load or generation of 10,000 MW or more*
● Category 0 - events below the above thresholds, such as SPS activations, useful for trending purposes.