绝缘纸对天然酯和矿物油热老化特性的影响

Effect of Insulating Paper on Thermal Ageing Properties of Natural Ester and Mineral Oil

本研究选取矿物油-纸、天然酯-纸、矿物油与天然酯4种样品在140℃下进行1640 h加速热老化试验,重点分析4种油样在不同老化阶段的酸值、介质损耗因数的变化规律,并对比老化油和纸的外观变化情况,来综合对比老化过程中绝缘纸的参与对不同绝缘油的性能影响差异。结果表明:无绝缘纸的老化油样酸值、介质损耗因数和老化程度都高于有绝缘纸的油样,有无绝缘纸的情况下天然酯的老化差异性相比矿物油要小一些,对于酸性物质容纳能力优于矿物油,并可以在一定程度上延缓绝缘纸的老化。

Accelerated thermal ageing test was conducted on mineral oil-paper,natural ester-paper,mineral oil,and natural ester at 140℃for 1640 h.The change law of acid value and dielectric dissipation factor of the four oil samples in different ageing stage were emphatically analyzed,and the appearance changes of aged oil and paper were compared.According to that,the influence of the participation of insulating paper on the properties of different insulating oils during the ageing process was comprehensively compared.The results show that the acid value,dielectric dissipation factor,and ageing degree of the aged oil samples without insulating paper are higher than those with insulating paper.The ageing difference of natural esters with and without insulating paper is smaller than that of mineral oil,and the holding capacity for acidic substances is better than that of mineral oil,which can delay the ageing of insulating paper to a certain extent.