Review of TADS Data for 2012 Voltage Class Name Metric AC Transmission Outages - Failed Protection...
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Transcript of Review of TADS Data for 2012 Voltage Class Name Metric AC Transmission Outages - Failed Protection...
Review of TADS Data for 2012
Voltage Class Name Metric
AC Transmission Outages - Failed
Protection System
Equipment
AC Transmission
Outages - Human Error
AC Transmission Outages - Failed AC Substation
Equipment
AC Transmission Outages - Failed
AC Circuit Equipment
AC Transmission
Outages - Lightning
AC Transmission
Outages - Contamination
AC Transmission
Outages - Foreign
Interference
Total
Element Availability Percentage
(APC)
Transmission System
Unavailability
AC Circuit 300-399 kV
Outages per Circuit 0.0262 0.0426 00.0589 0.0458 0.2013 0.0990 0.0607 0.7348 98.6192 1.3808
AC Circuit 300-399 kV
Outages per 100 miles per year 0.0804 0.1307 0.1809 0.1407 0.6333 0.3116 0.1910 2.3121
300-399 kV Jan-12 Dec-12
# Circuits 310 316
Circuit Miles 9845.6 10049.4
Multi-circuit Structure Miles 2755.3 2970.3
Automatic Outages
Circuit Data
Outage Information Count Duration (hrs)
Automatic 230 682.6
Non-Automatic 516 36295.1
Outage Data
Outage Information CountDuration
(hrs)
Two Elements 9 4.82
Three Elements 3 5.3
Four or More Elements 1 18.3
Multiple Element Automatic Outages
Fault Types Count % Count % Duration %No fault 4 2.67% 41 51.25% 259.67 38.04%P-P fault 1 0.67% 0 0.00% 0 0.00%P-G fault 134 89.33% 38 47.50% 422.9 61.96%P-P-G, 3P, or 3P-G fault 7 4.67% 1 1.25% 0.02 0.00%Unknown 4 2.67% 0 0.00% 0 0.00%Total 150 80 682.59
Momentary Sustained
Review of TADS Automatic Outage Data for 2012
7.3%
31.3%
15.3%10.7%
0.0%0.0%
1.3%
5.3%0.7%
0.7%
26.7%
0.7%
Momentary Outage Cause Weather, excluding lightning
Lightning
Contamination
Foreign Interference
Fire
Failed AC Substation Equipment
Failed Protection System Equipment
Failed AC Circuit Equipment
Power System Condition
Human Error
Unknown
Other
05
101520253035404550
Sustained Outages Momentary OutagesAutomatic Outages By Month
● Lightning, Contamination, and Unknown represent 73% of all momentary outages
● Momentary and Sustained automatic outages by month for 2012
Review of TADS Automatic Outage Data for 2012
2.5%
20.0%
10.0%
3.8%1.3%
22.5%
7.5%
7.5%
5.0%
15.0%
5.0% 0.0%
Sustained Outage Cause Weather, excluding lightning
Lightning
Contamination
Foreign Interference
Fire
Failed AC Substation Equipment
Failed Protection System Equipment
Failed AC Circuit Equipment
Power System Condition
Human Error
Unknown
Other
0.0%6.1%
0.0% 0.2%
2.8%
46.4%
2.9%
16.2%
21.3%
4.0%
0.1%0.0%
Sustained Outage DurationWeather, excluding lightning
Lightning
Contamination
Foreign Interference
Fire
Failed AC Substation Equipment
Failed Protection SystemEquipmentFailed AC Circuit Equipment
Power System Condition
Human Error
Unknown
Other
● Failed AC Substation Equipment represented 22% of sustained outage cause vs. 46% of sustained outage duration
● Failed AC Circuit Equipment represented 7% of sustained outage cause vs. 16% of sustained outage duration
Review of TADS Planned Outage Data for 2012
42482.2%
438.3%
40.8%
346.6%
81.6%
00.0%
30.6%
Planned & Operational Outage CauseMaintenance andConstruction3rd Party Request
Other Planned Outage
Emergency
System Voltage LimitMitigationSystem Operating LimitMitigationOther Operational Outage 29879.5
82%
1892.55%
258.51%
2354.756% 1270.75
4%0
0% 639.022%
Planned & Operational Outage Duration (Hours) Maintenance and
Construction3rd Party Request
Other Planned Outage
Emergency
System Voltage LimitMitigationSystem Operating LimitMitigationOther Operational Outage
0
10
20
30
40
50
60
70
80
Planned & Operational Outages by Month
0
1000
2000
3000
4000
5000
6000
7000
8000
Planned & Operational Outage Duration by Month (Hours)
Review of TADS Planned Outage Data for 2012
40.8%
10.2%
163.1% 23
4.5%
28455.0%
458.7%
14327.7%
Planned & Operational Outage Count by Duration
1-5 minutes
6-10 minutes
11-30 minutes
31-120 minutes
121 minutes to 24 hours
>24 hours to 48 hours
> 48 hours
● 55% of planned outage duration ranges from two to 24 hours
● 37% of planned outage duration is greater than 24 hours
TADS Comparison, 2011 vs 2012
2011 2012
Outage Information Count Duration (hrs) Count Duration (hrs)
Automatic 279 1908.6 230 682.6
Non-Automatic 787 46712.4 516 36295.1
2011 2012 2011 2012Voltage Class 300-399 kV 300-399 kV 300-399 kV 300-399 kV
Metric Outages/Number of circuits Outages/100 mi/year
AC Transmission Outages - Failed Protection System Equipment
0.0305 0.0262 0.0926 0.0804
AC Transmission Outages - Human Error0.0677 0.0426 0.2057 0.1307
AC Transmission Outages - Failed AC Substation Equipment
0.1320 0.0589 0.4011 0.1809
AC Transmission Outages - Failed AC Circuit Equipment
0.0508 0.0458 0.1543 0.1407
AC Transmission Outages - Lightning0.2067 0.2055 0.6376 0.6333
AC Transmission Outages - Contamination0.1667 0.1011 0.5142 0.3116
AC Transmission Outages - Foreign Interference0.0567 0.0620 0.1748 0.1910
Total 0.9300 0.7504 2.8694 2.3121
Element Availability Percentage (APC)98.0625 98.6192
Transmission System Unavailability1.9375 1.3808
TADS Comparison, 2010-2012
0
10
20
30
40
50
60
702010 2011 2012
Automatic Outages by Month
0
100
200
300
400
500
600
700
8002010 2011 2012
Automatic Outage Duration by Month (Hours)
0
20
40
60
80
100
120
1402010 2011 2012
Planned and Operational Outages by Month
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
100002010 2011 2012
Planned and Operational Outage Duration (Hours) by Month
TADS Comparison, 2008-2012
0
10
20
30
40
50
60
70
802008 2009 2010 2011 2012
Momentary Outages by Cause
0
5
10
15
20
25
302008 2009 2010 2011 2012
Sustained Outages by Cause
0
100
200
300
400
500
600
700
8002008 2009 2010 2011 2012
Sustained Outage Duration (Hours) by Cause
• April-May 2011 had higher than normal rate of contamination-related outages due to ongoing drought issues
• Sept 2011 had high sustained outage duration due to wildfires
Common Mode and Dependent Mode Outage Statistics2010-2012
• Dependent Mode outages (defined as an automatic outage of an element which occurred as a result of another outage)
• Common Mode outages (defined as one or more automatic outages with the same initiating cause and occur nearly simultaneously)
• In 2012, represented 6.0% of all momentary outages, 26.3% of all sustained outages (6.6% of sustained outage duration), and 13.0% of all automatic outages.
0.00%
1.00%
2.00%
3.00%
4.00%
5.00%
6.00%
7.00%
8.00%
Dependent ModeInitiating
Dependent Mode Common Mode Common ModeInitiating
2010 2011 2012Momentary Outage Modes Comparison
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
30.00%
Dependent ModeInitiating
Dependent Mode Common Mode Common ModeInitiating
2010 2011 2012Sustained Outage Modes Comparison
91.89%
0.72%
4.30%3.10%
0.00%
Avg AC Circuit Momentary Automatic Outage Mode
Single Mode
Dependent ModeInitiating
Dependent Mode
Common Mode
Common Mode Initiating
66.67%
3.86%
25.61%
3.86%0.00%
Avg AC Circuit Sustained Automatic Outage Mode
Single Mode
Dependent ModeInitiating
Dependent Mode
Common Mode
Common Mode Initiating
NERC Adequate Level of Reliability (ALR) Metrics
2010 2011 2012
Metric Definition ERCOTMetric
NERCMetric
ERCOTMetric
NERC Metric
ERCOTMetric
NERCMetric
ALR6-11 Automatic Outages Initiated by Failed Protection Equipment
4.95% 6.26% 3.05% 5.55% 2.62% 5.07%
ALR6-12 Automatic Outages Initiated by Human Error
1.41% 6.57% 6.77% 6.87% 4.26% 6.55%
ALR6-13 Automatic Outages Initiated by Failed AC Substation Equipment
8.13% 5.59% 13.2% 8.14% 5.89% 6.19%
ALR6-14 Automatic Outages Initiated by Failed AC Circuit Equipment
2.83% 5.89% 5.08% 5.37% 4.58% 4.78%
ALR6-15 Element Availability Percentage
98.64% 98.41% 98.06% 97.86% 98.62% 97.89%
Comparison of ERCOT to NERC metrics for Adequate Level of Reliability measurements