Analysis of radicals and copper(I) ion formed in initial oxidation stage of insulating oils.

Yanagisawa, Kazuhiro; Saito, M.; Matsunaga, Atushi; Nakamura, Yasushi

doi:10.1627/jpi1958.33.378

Cited by 1 publication

(2 citation statements)

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“…This conforms to the fact that the single-valent copper is stabilized by complexation with a variety of "soft" ligands whose electron orbitals are capable of hybridization with occupied d-orbitals of the Cu + ion; a number of such complexes with olefins, carbonyls, acetylenes as ligands have been described in the literature [11]. The presence of single-valent Cu(I) ions in oxidized insulating oil has also been directly confirmed by neocuproine titration [10].…”

Section: Oil Oxidationsupporting

confidence: 68%

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Copper Release Kinetics and Ageing of Insulation Paper in Oil-Immersed Transformers

Sevastyanova¹,

Pasalskiy²,

Zhmud³

2015

ENG

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The paper provides a general overview of chemical processes leading to the degradation of oilpaper insulation in oil-immersed electrical current transformers. Previous knowledge available in literature is complemented by new results placing a specific emphasis on the physicochemical factors which affect the copper release in the insulation oil and the oil oxidation kinetics. It is demonstrated that various ageing processes interact with each other, with one or another process dominating under specific conditions. Comprehensive but disjoint studies focusing on separate sub-processes may produce rather misleading results, and occasionally, lie behind rather irrelevant quality demands imposed on the insulating liquids.

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Section: Oil Oxidationsupporting

confidence: 68%

“…There are indications that Cu 2 O is more active in generation of radicals than CuO [10]. The two-valent copper ions, Cu(II), can be stabilized by complexation with a variety of bi-or poly-dentate ligands, such as aminoacids, hydroxycarboxylic acids, porphyrins, etc.…”

Section: Oil Oxidationmentioning

confidence: 99%