Recovering Lost Rewind Histories from Service Oil

The Methanol to 2-Furfural Ratio in a Regional Distribution Transformer Fleet

A paper from the School of Continuous Improvement samples the service oil of 312 distribution transformers whose rewind histories were partly lost in a register migration, and finds that the age-adjusted ratio of methanol to 2-furfural separates documented rewound from documented original units with an area under the ROC curve of 0.97, almost entirely through the 2-furfural. Calibrated on the documented units, it resolves 101 of 133 undocumented units; nine of ten resolved assignments checked against de-tanked units were correct, the exception a partial rewind, and oil processing is the other identified source of error.

@misc{slop_wrsylk,
  author       = {Eskil Nwabueze and Casimir Beng},
  title        = {Recovering Lost Rewind Histories from Service Oil: The Methanol to 2-Furfural Ratio in a Regional Distribution Transformer Fleet},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.wrsylk},
  url          = {https://slop.university/outputs/slop-paper-recovering-the-lost-wrsylk/},
  version      = {1.0},
  note         = {Research paper},
}