基于时变指前因子和频域介电谱平移系数的油浸纸热老化评估方法  

Thermal Aging Assessment Method of Oil Impregnated Paper Based on Time-Varying Pre-Exponential Factor and Translation Coefficient of Frequency Domain Spectroscopy

作　　者：黎枝鑫 王东阳[1] 温荣婷 廖维 周利军[1] Li Zhixin;Wang Dongyang;Wen Rongting;Liao Wei;Zhou Lijun(School of Electrical Engineering Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《电工技术学报》2022年第17期4487-4496,4516,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金高铁联合基金(U1834203);国家自然科学基金(51877183);四川省科技计划(2020JDTD0009)资助项目。

摘　　要：油浸纸老化过程中产生的微水和酸等杂质不仅对老化具有催化作用,其中的极性产物还会参与到材料的介电响应过程中。为了利用传统老化动力学模型从微观分子链断裂角度准确地描述油浸纸老化过程的特点,以及利用频域介电谱无损、快速测量的特点,更好地分析油浸纸老化过程,该文通过对油浸纸老化的分析以及理论推导,提出一种不同介电响应过程的分离方法用来分析不同老化油浸纸试样频域介电谱曲线,引入老化修正平移系数和时变指前因子的概念,并将其代入传统老化动力学模型得到了老化修正模型。制备了不同老化程度的油浸纸试样,对试样进行聚合度和频域介电谱测试,并将修正老化动力学模型代入聚合度-时间曲线中,验证了模型的正确性。最后提出了一种油浸纸老化评估方法,并通过试验验证了该方法的有效性。结果表明:基于老化修正平移系数和时变指前因子的油浸纸老化修正模型能够很好地拟合聚合度变化曲线,基于此提出的老化评估方法,相对误差较小,可以用于评估油浸纸老化。Not only moisture,acid and other impurities produced in the aging process of oil impregnated paper have catalytic effect on the aging,but also the polar products participate in the dielectric response process of the material.In order to use the characteristic of traditional aging dynamic model in describing the aging process of oil impregnated paper from the perspective of micro molecular chain fracture,as well as the nondestructive,fast measurement characteristics of frequency domain spectroscopy to better analysis the aging process of oil impregnated paper,a separation method of different dielectric response processes was proposed to analyze the frequency domain spectroscopy curves of different aged oil impregnated paper samples by the analysis and theoretical derivation of oil impregnated paper aging.The concepts of aging modified translation coefficient and time-varying pre-exponential factor were proposed.The aging modified model was obtained by introducing the aging modified translation coefficient and time-varying pre-exponential factor into the traditional aging dynamic model,and the oil impregnated paper samples with different aging degree were prepared.The degree of polymerization and frequency domain spectroscopy of the samples were tested,and the modified aging kinetics model was introduced the degree of polymerization and time curve to verify the correctness of the model.Finally,an aging evaluation method for oil impregnated paper was proposed and the effectiveness of this method was verified by experiments.The results show that the modified aging model based on the aging modified translation coefficient and time-varying pre-exponential factor can well fit the curve of degree of polymerization,which verifies the effectiveness of the proposed aging modified translation coefficient and time-varying pre-exponential factor.Based on this relationship,an aging evaluation method was proposed,the relative error of this evaluation method is small,which can be used to evaluate the aging of oil impregnated pape

关 键 词：油浸纸老化 修正老化动力学模型 老化评估 老化修正平移系数 时变指前因子 

分 类 号：TM855[电气工程—高电压与绝缘技术]