| Table 8.13.B. U.S. Transformer Sustained Automatic Outage Counts and Hours by Cause Code and by NERC Region, 2011 |
| Transformer Outage Counts | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Sustained Outage Causes | FRCC | MRO | NPCC | RFC | SERC | SPP | TRE | WECC | Contiguous U.S. |
| Weather, excluding lightning | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Lightning | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Environmental | -- | 1.00 | -- | -- | -- | -- | -- | -- | 1.00 |
| Contamination | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Foreign Interference | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fire | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Vandalism, Terrorism, or Malicious Acts | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Failed AC Substation Equipment | 2.00 | -- | -- | 5.00 | 4.00 | 1.00 | -- | 3.00 | 15.00 |
| Failed AC/DC Terminal Equipment | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Failed Protection System Equipment | -- | -- | -- | 1.00 | 1.00 | -- | -- | -- | 2.00 |
| Failed AC Circuit Equipment | -- | -- | 4.00 | 2.00 | -- | -- | -- | -- | 6.00 |
| Failed DC Circuit Equipment | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Vegetation | -- | -- | -- | -- | 1.00 | -- | -- | -- | 1.00 |
| Power System Condition | -- | 1.00 | -- | -- | 2.00 | -- | -- | -- | 3.00 |
| Human Error | -- | 1.00 | -- | 2.00 | -- | -- | -- | 1.00 | 4.00 |
| Unknown | -- | -- | -- | 1.00 | 1.00 | -- | -- | -- | 2.00 |
| Other | -- | -- | -- | 1.00 | -- | -- | -- | -- | 1.00 |
| TOTAL | 2.00 | 3.00 | 4.00 | 12.00 | 9.00 | 1.00 | -- | 4.00 | 35.00 |
| Percentage of Total Transformer Outage Counts | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Sustained Outage Causes | FRCC | MRO | NPCC | RFC | SERC | SPP | TRE | WECC | Contiguous U.S. |
| Weather, excluding lightning | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Lightning | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Environmental | 0.00% | 33.33% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 2.86% |
| Contamination | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Foreign Interference | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Fire | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Vandalism, Terrorism, or Malicious Acts | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Failed AC Substation Equipment | 100.00% | 0.00% | 0.00% | 41.67% | 44.44% | 100.00% | -- | 75.00% | 42.86% |
| Failed AC/DC Terminal Equipment | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Failed Protection System Equipment | 0.00% | 0.00% | 0.00% | 8.33% | 11.11% | 0.00% | -- | 0.00% | 5.71% |
| Failed AC Circuit Equipment | 0.00% | 0.00% | 100.00% | 16.67% | 0.00% | 0.00% | -- | 0.00% | 17.14% |
| Failed DC Circuit Equipment | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Vegetation | 0.00% | 0.00% | 0.00% | 0.00% | 11.11% | 0.00% | -- | 0.00% | 2.86% |
| Power System Condition | 0.00% | 33.33% | 0.00% | 0.00% | 22.22% | 0.00% | -- | 0.00% | 8.57% |
| Human Error | 0.00% | 33.33% | 0.00% | 16.67% | 0.00% | 0.00% | -- | 25.00% | 11.43% |
| Unknown | 0.00% | 0.00% | 0.00% | 8.33% | 11.11% | 0.00% | -- | 0.00% | 5.71% |
| Other | 0.00% | 0.00% | 0.00% | 8.33% | 0.00% | 0.00% | -- | 0.00% | 2.86% |
| TOTAL | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | -- | 100.00% | 100.00% |
| Transformer Outage Hours | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Sustained Outage Causes | FRCC | MRO | NPCC | RFC | SERC | SPP | TRE | WECC | Contiguous U.S. |
| Weather, excluding lightning | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Lightning | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Environmental | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Contamination | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Foreign Interference | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fire | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Vandalism, Terrorism, or Malicious Acts | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Failed AC Substation Equipment | 7,459.68 | 12.57 | -- | 7,368.85 | 9,702.97 | 2.33 | -- | 81.93 | 24,628.33 |
| Failed AC/DC Terminal Equipment | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Failed Protection System Equipment | -- | -- | -- | 27.98 | -- | -- | -- | -- | 27.98 |
| Failed AC Circuit Equipment | -- | -- | 454.25 | 18.92 | -- | -- | -- | -- | 473.17 |
| Failed DC Circuit Equipment | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Vegetation | -- | -- | -- | -- | 4.22 | -- | -- | -- | 4.22 |
| Power System Condition | -- | -- | -- | -- | 91.90 | -- | -- | -- | 91.90 |
| Human Error | -- | 11.47 | -- | 8.40 | -- | -- | -- | 1.30 | 21.17 |
| Unknown | -- | -- | -- | -- | 12.67 | -- | -- | -- | 12.67 |
| Other | -- | 0.43 | -- | -- | -- | -- | -- | -- | 0.43 |
| TOTAL | 7,459.68 | 24.47 | 454.25 | 7,424.15 | 9,811.76 | 2.33 | -- | 83.23 | 25,259.87 |
| Percentage of Total Transformer Outage Hours | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| outage_cause | FRCC | MRO | NPCC | RFC | SERC | SPP | TRE | WECC | Contiguous U.S. |
| Weather, excluding lightning | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Lightning | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Environmental | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Contamination | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Foreign Interference | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Fire | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Vandalism, Terrorism, or Malicious Acts | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Failed AC Substation Equipment | 100.00% | 51.37% | 0.00% | 99.26% | 98.89% | 100.00% | -- | 98.44% | 97.50% |
| Failed AC/DC Terminal Equipment | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Failed Protection System Equipment | 0.00% | 0.00% | 0.00% | 0.38% | 0.00% | 0.00% | -- | 0.00% | 0.11% |
| Failed AC Circuit Equipment | 0.00% | 0.00% | 100.00% | 0.25% | 0.00% | 0.00% | -- | 0.00% | 1.87% |
| Failed DC Circuit Equipment | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| Vegetation | 0.00% | 0.00% | 0.00% | 0.00% | 0.04% | 0.00% | -- | 0.00% | 0.02% |
| Power System Condition | 0.00% | 0.00% | 0.00% | 0.00% | 0.94% | 0.00% | -- | 0.00% | 0.36% |
| Human Error | 0.00% | 46.87% | 0.00% | 0.11% | 0.00% | 0.00% | -- | 1.56% | 0.08% |
| Unknown | 0.00% | 0.00% | 0.00% | 0.00% | 0.13% | 0.00% | -- | 0.00% | 0.05% |
| Other | 0.00% | 1.76% | 0.00% | 0.00% | 0.00% | 0.00% | -- | 0.00% | 0.00% |
| TOTAL | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | -- | 100.00% | 100.00% |
| Notes: Detailed information on the Transmission Availability Data System outage causes is available at: http://www.nerc.com/docs/pc/tadswg/Appendix%207%2020101202a%20clean.pdf Source: U.S. Energy Information Administration, Form EIA-411, "Coordinated Bulk Power Supply Program Report." |