Equipment Failure Rates: Transformer
E38-111 to E38-221
Equipment failure rates, MTBF, MTTR, and downtime statistics for electrical and mechanical plant equipment. Primary data from the USACE PREP reliability database (IEEE Std 3006.8-2018 Table 2), covering ~280 equipment classes. Supplemental data from IEEE motor and transformer surveys.
| equipment type | class code | description | failure rate per year (failures/year) | failures (count) | mdt hours (h) | mtbf hours (h) | mttm hours (h) | mttr hours (h) | standard | survey | unit years (unit-years) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Transformer | E38-111 | Transformer, dry, air cooled, ≤ | 0.002625 | 226 | 2.33 | 3,337,148 | 2.36 | 2.13 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 86,095.4 |
| Transformer | E38-112 | Transformer, dry, air cooled, | 0.001764 | 3 | 36.5 | 4,964,760 | 5.41 | 2 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 1,700.3 |
| Transformer | E38-121 | Transformer, dry, isolation, | 0.002795 | 19 | 2.52 | 3,134,156 | 0.93 | 21.26 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 6,797.8 |
| Transformer | E38-211 | Transformer, liquid, forced air, | 0.00889 | 52 | 2.08 | 985,418 | 0.98 | 8.69 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 5,849.5 |
| Transformer | E38-212 | Transformer, liquid, forced air, | 0.038292 | 23 | 23.6 | 228,766 | 22.96 | 251 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 600.6 |
| Transformer | E38-213 | Transformer, liquid, forced air, | 0.070519 | 34 | 24.34 | 124,222 | 21.69 | 965.33 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 482.1 |
| Transformer | E38-214 | Transformer, liquid, forced air, | 1.289753 | 24 | 5.3 | 6,792 | 2.43 | 11.95 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 18.6 |
| Transformer | E38-221 | Transformer, liquid, non-forced | 0.001055 | 63 | 2.02 | 8,302,262 | 2 | 2.33 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 59,708 |
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