不同放电能量下酯类绝缘油的产气差异性分析  

Gas Generation Difference Analysis of Ester Insulating Oil Under Different Discharge Energy

作　　者：邢亚东 董明[1] 刘阳 胡一卓 余家赫 席英杰 徐阳[1] XING Yadong;DONG Ming;LIU Yang;HU Yizhuo;YU Jiahe;XI Yingjie;XU Yang(State Key Library of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《中国电机工程学报》2023年第15期6099-6111,共13页Proceedings of the CSEE

基　　金：国家自然科学基金项目(U1866603)。

摘　　要：酯类绝缘油作为一种环境友好型绝缘液,在电力变压器中的应用越来越广泛。但不同酯类绝缘油的理化、电气特性具有显著的差异,在相同故障下其产气规律也有一定的区别。该文以天然酯、改性酯以及合成酯为研究对象,研究其在不同放电能量下的产气规律与产气差异,并将特征气体含量与放电能量进行关联性分析。结果表明,不同酯类绝缘油的产气规律具有一定差异,天然酯绝缘油易产生更多的H_(2)和C_(2)H_(6),改性酯和合成酯绝缘油易产生较多的C_(2)H_(4)和C_(2)H_(2),绝缘油的分子结构和特征气体的溶解特性差异是影响油中溶解气体的主要原因;随着放电能量的增加,H_(2)、CH_(4)和C_(2)H_(6)占比呈现下降趋势,C_(2)H_(2)、C_(2)H_(4)以及CO占比呈现上升趋势;通过特征气体的单位焦耳产气量、C_(2)H_(2)/H_(2)比值以及CO含量可以定性判断放电故障的严重程度。结果可为酯类绝缘油变压器的状态诊断提供参考。Ester insulating oils are increasingly being used in power transformers as environmental-friendly insulating fluid.However,there are significant differences in the physicochemical and electrical properties of different ester insulating oils,and their gas generation laws under the same fault type are also somewhat different.In this paper,natural,modified and synthetic esters are used to study the gas generation law and differences at different discharge energies,and the correlation between characteristic gas content and discharge energy is analyzed.The results show that there are some differences in the gas generation law of ester insulating oil with different molecular structures and compositions.Natural esters are prone to produce more H_(2)and C_(2)H_(6),while modified esters and synthetic esters are prone to produce more C_(2)H_(4)and C_(2)H_(2).Differences in the molecular structure of the insulating oil and the dissolution characteristics of the gases are the main reasons for the dissolved gases in oil.With the increase of discharge energy,the relative percentage contents of H_(2),CH_(4)and C_(2)H_(6)decrease,while the relative percentage contents of C_(2)H_(2),C_(2)H_(4)and CO increase.In addition,the severity of the discharge fault can be qualitatively determined by fault gas volumes per unit fault energy,the ratio of C_(2)H_(2)/H_(2)and the CO content,which can provide reference for the state diagnosis of ester insulating oil transformers.

关 键 词：酯类绝缘油 溶解气体 放电能量 差异性分析 

分 类 号：TM855[电气工程—高电压与绝缘技术]