The accompanying files include dissolved gas analysis records from coolant oil in 13 UK power station transformers for various timespans between 2010-2015.

The files are presented in comma separated variable format. Each file includes a header line, describing the content of each "column" of data. After this header, each line includes one record corresponding to the timestamp indicated in the first column (in Universal Time). Data are recorded in units of parts per million (ppm).

With the exception of Transformers C and D, concentrations of 8 trace gases are recorded in each phase of the transformer. For Transformers C and D, concentrations of 8 trace gases are recorded in one phase only.

Please cite Lewis et al. [2022] if using these data. The authors thank D. Barker, EDF Energy Nuclear Generation, for providing these data.