针-板电极结构下三元混合绝缘油纸复合体系沿面放电特性研究  

Creeping Discharge Characteristics of Three-element Mixed Insulating Oil-paper Composite System Under Needle-plate Electrode Structure

作　　者：陈鑫 郝建[2] 高晨煜 冯大伟[2] 廖瑞金[2] 叶文郁 CHEN Xin;HAO Jian;GAO Chenyu;FENG Dawei;LIAO Ruijin;YE Wenyu(State Grid Wuxi Power Supply Company,Wuxi 214000,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]国网无锡供电公司,江苏无锡214000 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《绝缘材料》2022年第1期52-61,共10页Insulating Materials

基　　金：国家自然科学基金面上项目(52077015)。

摘　　要：基于一种具有优良理化、电气性能的新型三元混合绝缘油,以矿物绝缘油纸复合体系为参比,在针-板电极结构下分析了三元混合绝缘油纸复合体系的沿面放电特性,并对两种绝缘油纸复合体系在针-板电极结构下的电场分布进行仿真;基于密度泛函理论,对天然酯分子和矿物绝缘油分子能带结构开展对比研究。结果表明:与矿物绝缘油纸复合体系相比,在沿面放电故障下,三元混合绝缘油纸复合体系具有更小的局部放电起始电压、闪络电压以及更大的最大放电量、放电脉冲数。两种绝缘油纸复合体系在针-板电极下的电场分布差异较小。三元混合绝缘油中棕榈油分子和大豆油分子的能隙均小于矿物油分子,因此在强电场作用下混合油分子更容易发生电离。On the basis of a new type of three-element mixed insulating oil with excellent physichemical and electrical properties,and taking the mineral insulating oil-paper composite system as a reference,the creeping discharge characteristics of the three-element mixed insulating oil-paper composite system were analyzed under needle-plate electrode structure.The electric field distribution of two insulating oil-paper composite systems were simulated under needle-plate electrode structure.On the basis of density functional theory,the energy band structures of natural ester molecule and mineral oil molecule were studied comparatively.The results show that compared with the mineral insulating oil-paper composite system,the three-element mixed insulating oil-paper composite system has smaller partial discharge inception voltage,flashover voltage and larger maximum discharge magnitude,discharge pulse number under creeping discharge fault.There is small difference on electric field distribution between two insulating oil-paper composite systems under needle-plate electrode structure.The energy gap of palm oil molecule and soybean oil molecule in mixed oil are smaller than that of the mineral oil molecule,therefore,the mixed oil molecule is more likely to ionize under strong electric field.

关 键 词：混合油 沿面放电 针-板电极 能带结构 

分 类 号：TM214[一般工业技术—材料科学与工程] TM215[电气工程—电工理论与新技术]