Vegetable oil electrical properties analysis for power insulation use



Abstract. Transformer industry called upon insulating oils, among them mineral oils used since more than one century, and PCBs which are prohibited because of their high toxicity and non-biodegradability and it could be source of contamination of soils and waterways, in the other hand petroleum based mineral oils are going to run out according to many studies. For these reason many studies undertaken by researchers and industrial groups allowed improvements of the performances of mineral oils, and the design of new liquids of substitution to replace the PCBs such synthetic esters and silicones. Although they present good properties, they remain nonrenewable sources and poorly biodegradable substances, hence the necessity to seek other alternative oils that resolve both problems of biodegradability and durability, criteria that vegetable oils correspond perfectly. In this paper, we report results of the behavior of a vegetable oil (olive oil) subjected to a thermal stress of 110°C in an oven for 716 hours duration by checking the evolution of the electric and physicochemical properties in regular intervals of time. The results so obtained show a decrease in flashpoint and water content inducing an increase of breakdown voltage. However, a trend of increase in total acidity and viscosity are observed.

Olive Oil, Transformers, Dielectric Liquids, Thermal Aging

Published online 12/10/2016, 6 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: O. IDIR, A. REFFAS, S. AMEUR, F. CHETIBI, H. MOULAI, I. KHELFANE, M. OUAGUENI, A. BEZAZ, ‘Vegetable oil electrical properties analysis for power insulation use’, Materials Research Proceedings, Vol. 1, pp 25-30, 2016

The article was published as article 7 of the book Dielectric Materials and Applications

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