糠醛在油纸绝缘系统中的动态扩散过程

发布时间：2019-05-14 22:50

【摘要】：油中糠醛评估绝缘纸老化受温度及换油的影响,建立可靠的糠醛温度归一化和换油修正方法的前提是分析糠醛在绝缘油中的动态扩散过程。以实验室加速热老化为基础,研究了四种不同温度、四种不同老化程度油纸绝缘样品中糠醛的扩散过程;以菲克第二定律为理论依据,研究了不同温度、不同老化程度下糠醛在绝缘油中的扩散系数,建立糠醛动态扩散模型,并使用试验数据对其进行了验证。研究结果表明,糠醛在绝缘油中的扩散受温度和老化程度的影响:温度越高,老化程度越深,则糠醛在绝缘油中的扩散速度越快,越容易达到扩散平衡。提出现场变压器糠醛扩散平衡时间的计算方法,在达到扩散平衡后进行油中糠醛检测才能获得可靠数据。
[Abstract]:Furfural in oil is evaluated by the influence of temperature and oil exchange on the aging of insulation paper. the premise of establishing a reliable method of furfural temperature normalization and oil exchange correction is to analyze the dynamic diffusion process of furfural in insulating oil. On the basis of accelerated thermal aging in laboratory, the diffusion process of furfural in four kinds of oil paper insulation samples with different temperature and different aging degree was studied. Based on Fick's second law, the diffusion coefficients of furfural in insulating oil at different temperatures and different aging degrees were studied. The dynamic diffusion model of furfural was established and verified by experimental data. The results show that the diffusion of furfural in insulating oil is affected by temperature and aging degree. The higher the temperature and the deeper the aging degree, the faster the diffusion rate of furfural in insulating oil and the easier it is to reach the diffusion equilibrium. The calculation method of furfural diffusion equilibrium time of field transformer is put forward, and the reliable data can be obtained only by detecting furfural in oil after reaching diffusion balance.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);
【基金】：国家自然科学基金创新研究群体科学基金资助项目(51321063)
【分类号】：TM855

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