1965
DOI: 10.1149/1.2423555
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The Role of Copper During the Oxidation of Transformer Oils

Abstract: Air oxidation of two transformer oils, differing mainly in the fact that one contained metal deactivator, was studied at 95°C in the presence and absence of metallic copper. Power factor, hydroperoxide and carbonyl oxidation intermediates, and copper contents were measured as a function of time. In the absence of metallic copper, oxidation of the two oils is quite similar. Curves of power factor and oxidation intermediates show no striking differences. There appears to be a relation between power factor and ca… Show more

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Cited by 16 publications
(7 citation statements)
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“…The commercial transformer oil exhibits a peak very early in the oxidation followed by rapid oxidative degradation. This peak is due primarily to the conductivity of soluble copper (5).…”
Section: Resultsmentioning
confidence: 99%
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“…The commercial transformer oil exhibits a peak very early in the oxidation followed by rapid oxidative degradation. This peak is due primarily to the conductivity of soluble copper (5).…”
Section: Resultsmentioning
confidence: 99%
“…As the oil oxidatively degrades, the conductivity of the oil increases and the power factor rises. A more detailed discussion of the test has been reported (5).…”
Section: Methodsmentioning
confidence: 99%
“…Transition metal ions, notably copper, acting as initiators of the radical reactions, are known to increase the oxidation rate of hydrocarbons. The classical theory of the copper-catalysed oxidation process assumes the following initiation step, This mechanism-homogeneous catalytic oxidation-is supported by the fact that the concentration of peroxides in oils oxidized by air increases with increasing the copper concentration [5].…”
Section: Oil Oxidationmentioning
confidence: 99%
“…Water and oxygen trigger corrosion of metallic parts. The subsequent release of transitional metal ions, in particular copper, will catalyse further oxidation of the oil [5]. Oil oxidation products, some of which have acidic character, will gradually accumulate in oil, contributing to protonic conductivity and eventually causing unwanted electrochemical processes, e.g.…”
Section: Introductionmentioning
confidence: 99%
“…The presence of zinc, lithium, and silver compounds as cobalttypes is further evidence against the catalytic cycle; it is difficult to imagine a reversible one-electron redox cycle for these metals even in a nonpolar environment. Hydroperoxide and hydroperoxy complexes with metal ions have been proposed as intermediates in catalytic reactions (Chalk and Smith, 1957;Melchiore and Mills, 1965). The changes in the thermograms can then be explained by postulating the formation of such complexes:…”
Section: M2+ + Roohmentioning
confidence: 99%