Influence of moisture and oxygen on aging of oil-paper insulation

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2013-10-01 DOI:10.1109/CEIDP.2013.6747086

Yantao Li, Guangning Wu, Wei Li, Yunguang Cui, B. Gao

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引用次数: 4

Abstract

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.

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水分和氧气对油纸绝缘老化的影响

为研究水分和氧气对油纸绝缘老化过程的影响机理，设计了不同水分和氧气含量的矿物油纸样品在不同温度下进行热老化的加速热老化实验。在老化过程中测定了油脂中的聚合度(DP)和糠醛，验证了在水分和氧气条件下，聚合度的变化对二级动力学模型参数的影响。实验结果表明:水分和温度作用下的加速老化现象明显，低含水率的水氧之间存在拮抗作用。油中的氧会阻止水与纤维素的相互作用，并且随着氧含量的增加，这种作用会越来越明显，从而降低绝缘纸的老化速度;在老化过程中，湿、氧含量和绝缘纸的种类会影响糠醛的变化趋势。

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2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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