![]() Furthermore, a statistical overview of methanol concentration from a database and two transformer fault diagnostic cases are presented. This means that methanol is a paper-degradation marker that can be used in diagnostics over shorter equilibrium times and for the detection of developing faults at broader temperature ranges. ![]() The results of partitioning experiments at 60 ☌ showed that re-absorption of methanol from oil to the cellulose materials is faster than the re-absorption of furans. The results of aging experiments at 120 ☌ and 60 ☌ of Kraft paper, copper, barrier, and pressboard immersed in mineral oil, as well as the aging of thermal upgrade paper in mineral and natural ester oil at 140 ☌ are presented, in order to investigate correlations between different aging markers and to evaluate their partitioning between oil and cellulose at defined conditions. ![]() This article presents a method for quantification of methanol and ethanol integrated in the same gas-chromatographic run with a quantification of gases dissolved in mineral oil, making it an integrated tool in transformer diagnostics.
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