Influence of Moisture and Oxygen on Aging of Oil-paper Insulation

To research the influence mechanism of moisture and oxygen on the aging process of oil-paper insulation, accelerated thermal aging experiment which the mineral oil-paper samples with different moisture and oxygen contents were thermally aged under different temperature has been designed. The degree of polymerization (DP) and furfural in oil were measured during the aging process, and the influence of changes in the degree of polymerization on the second-order kinetics model parameters were verified under the condition of moisture and oxygen. Experimental results indicate that: the phenomenon of accelerated aging under the effect of moisture and temperature is obvious, there is an antagonistic effect between water and oxygen with low moisture content. Oxygen in oil will prevents the interaction of water and cellulose, and with the increase of the oxygen content it will become more and more obvious, thereby the rate of aging of the insulating paper will be reduced; Moisture and oxygen content and the type of insulation paper will affect furfural variation tendency during the aging process.