烷基苯绝缘油热老化过程中的多参量关联性分析  

Multi-parameter correlation analysis of alkylbenzene insulating oil during thermal ageing

作　　者：廖建平 刘志峰 杨小爱 高帆 陈宇飞 徐永烨 汪红梅[2] 朱志平[2] LIAO Jianping;LIU Zhifeng;YANG Xiaoai;GAO Fan;CHEN Yufei;XU Yongye;WANG Hongmei;ZHU Zhiping(Electric Power Research Institute of EHV Transmission Company,China Southern Power Grid Co.,Ltd.,Guangzhou 510663,China;Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]南方电网超高压输电公司电力科研院,广东广州510663 [2]长沙理工大学电力与交通材料防护湖南省重点实验室,湖南长沙410114

出　　处：《绝缘材料》2024年第12期74-81,共8页Insulating Materials

基　　金：南方电网超高压输电公司科技项目(CGYKJXM20220080);湖南省教育厅科学研究重点项目(23A0269)。

摘　　要：为研究充油高压电缆内部铜和绝缘纸对烷基苯绝缘油性能的影响,将烷基苯绝缘油置于4种不同环境中,在120℃的条件下进行50天热老化实验,测定老化过程中油样酸值、介质损耗因数、界面张力、水含量等老化特征参量,并采用回归分析法研究4个指标之间的关联性。结果表明:随老化时间增加,油样老化程度加剧,其中铜加快了烷基苯绝缘油的老化,绝缘纸对烷基苯绝缘油的老化无明显作用;绝缘油的介质损耗因数与其酸值、水含量呈正相关性,与界面张力呈负相关,且均呈指数函数关系,其回归拟合方程为y=A_(1)·exp(±x/t_(1))+y_(0),拟合优度大于0.94;多元线性回归结果中介质损耗因数与酸值、界面张力、水含量存在共同制约关系。In order to investigate the influence of copper and insulating paper on the properties of alkylbenzene insulating oil inside oil-filled high-voltage cables,alkylbenzene insulating oil was placed in four different environments and subjected to a thermal ageing experiment at 120℃for 50 days.Ageing characteristic parameters of oil sample such as acid value,dielectric loss factor,interfacial tension,and water content were measured during the ageing process,and the correlation between the four indicators was studied using regression analysis.The results show that as the ageing time increases,the ageing degree of oil sample intensifies,copper accelerats the ageing of alkylbenzene insulating oil,while insulating paper has no significant effect on the ageing of the oil.The dielectric loss factor of insulating oil is positively correlated with its acid value and water content,and negatively correlated with interfacial tension,both of which are exponential functions.The regression fitting equation is y=A_(1)·exp(±x/t_(1))+y_(0),and the goodness of fit is greater than 0.94.In the results of multiple linear regression,there is a common constraint relationship between the dielectric loss factor,acid value,interfacial tension,and water content.

关 键 词：烷基苯绝缘油 热老化 相关性 回归分析 

分 类 号：TM214[一般工业技术—材料科学与工程]