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A commercial dodecylbenzene (DDB) cable oil was aged at temperatures between 90 and 135degC in air and was analyzed using various analytical techniques including optical and infra-red spectroscopy and dielectric analysis. On ageing, the oil darkened, significant oxidation features were found by infra-red spectroscopy and the acid number, water content and dielectric loss all increased. Ageing in the...
The mineral oil/paper insulating medium used in high voltage applications is subject to ageing through electrical, thermal and mechanical stresses. A significant factor in ageing is chemical action through moisture, metal contaminants and oxidation. The stresses change the properties of the paper and oil, which ages the insulation system. Transmission and distribution operators use condition monitoring...
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