Equipment Failure Rates: Transformer
E38-222 to XFMR-AGE-300K-GT25
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 | E38-222 | Transformer, liquid, non-forced | 0.005243 | 1 | 2.5 | 1,670,904 | 2.67 | 1 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 190.7 |
| Transformer | E38-223 | Transformer, liquid, non-forced | 0.016812 | 11 | 0.65 | 521,068 | 0.58 | 6.09 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 654.3 |
| Transformer | XFMR-1979-LIQ-10M | Transformer liquid filled >10000 kVA (1979 survey) | 0.0153 | — | 192 | — | — | 1,178.5 | IEEE Std 3006.8-2018 | IEEE 1979 Transformer Survey | — |
| Transformer | XFMR-1979-LIQ-300K | Transformer liquid filled 300-10000 kVA (1979 survey) | 0.0059 | — | 79.3 | — | — | 297.4 | IEEE Std 3006.8-2018 | IEEE 1979 Transformer Survey | — |
| Transformer | XFMR-1979-LIQ-ALL | Transformer all liquid filled (1979 survey) | 0.0062 | — | 85.1 | — | — | 356.1 | IEEE Std 3006.8-2018 | IEEE 1979 Transformer Survey | — |
| Transformer | XFMR-AGE-10M-11-25 | Transformer liquid >10000 kVA age 11-25 yr | 0.0246 | 7 | — | — | — | — | IEEE Std 3006.8-2018 | IEEE Transformer Age Study | 283.5 |
| Transformer | XFMR-AGE-10M-GT25 | Transformer liquid >10000 kVA age >25 yr | 0.0126 | 2 | — | — | — | — | IEEE Std 3006.8-2018 | IEEE Transformer Age Study | 158 |
| Transformer | XFMR-AGE-300K-1-10 | Transformer liquid 300-10000 kVA age 1-10 yr | 0.0072 | 19 | — | — | — | — | IEEE Std 3006.8-2018 | IEEE Transformer Age Study | 2,625.5 |
| Transformer | XFMR-AGE-300K-11-25 | Transformer liquid 300-10000 kVA age 11-25 yr | 0.0053 | 47 | — | — | — | — | IEEE Std 3006.8-2018 | IEEE Transformer Age Study | 8,846.5 |
| Transformer | XFMR-AGE-300K-GT25 | Transformer liquid 300-10000 kVA age >25 yr | 0.006 | 36 | — | — | — | — | IEEE Std 3006.8-2018 | IEEE Transformer Age Study | 5,938 |
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