Abstract:New insulating materials, as biodegradable oils and upgraded paper, need to be investigated. In this paper, the ageing of a wood pulp -cotton presspaper is studied. Solid insulation is impregnated and aged with three different fluids: a mineral oil and two vegetable oils, from sunflower and soybean. Both oils and paper were dried before the ageing process, which was carried out at 150ºC for 732 hours in iron vessels. Degradation of oils is analysed through the measurement of their breakdown voltage, dielectric… Show more
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