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


The paper provides a general overview of chemical processes leading to the degradation of oil-paper 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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Sevastyanova, O. , Pasalskiy, B. and Zhmud, B. (2015) Copper Release Kinetics and Ageing of Insulation Paper in Oil-Immersed Transformers. Engineering, 7, 514-529. doi: 10.4236/eng.2015.78048.

Conflicts of Interest

The authors declare no conflicts of interest.


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