不同交直流复合电压下油浸绝缘纸微观结构及电气性能的变化规律分析  

Analysis of Microstructure and Electrical Properties of Oil-impregnated Insulation Paper Under Different AC/DC Composite Voltages

作　　者：欧阳希 周湶[1] 李雪丰 姜茜 OUYANG Xi;ZHOU Quan;LI Xuefeng;JIANG Qian(State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Shapingba District,Chongqing 400044,China;Xuzhou Maintenance Branch of Jiangsu State Grid,Xuzhou 221000,Jiangsu Province,China)

机构地区：[1]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),重庆市沙坪坝区400044 [2]国网江苏省电力有限公司检修分公司徐州运维站,江苏省徐州市221000

出　　处：《中国电机工程学报》2019年第24期7394-7404,共11页Proceedings of the CSEE

基　　金：国家自然科学基金智能电网联合基金项目((U1866603)~~

摘　　要：为了充分掌握换流变压器中油浸绝缘纸缺陷产生规律,并提出处理方法,指导新型绝缘材料的研发,需深入分析复合电压累积放电作用下绝缘纸微观结构、电气性能的变化规律。搭建交直流复合电压下油浸绝缘纸放电损伤试验平台,探究不同复合电压下材料微观结构、电气性能的变化规律及关联机制。研究结果表明:不同复合电压下,微观结构及电气性能劣化机理存在一致性,局部放电可造成绝缘纸表面结构逐步损伤,并引起表面粗糙度的增加、纤维素中糖苷键的断裂及羧基类固体物质的产生,进一步导致绝缘纸介电常数、体积电导率和介质损耗等参量增加;由于气隙及绝缘纸中复合电压、空间电荷分布规律的差异影响,直流电压比例的增加将减缓绝缘纸微观结构和电气性能的劣化。The effect of partial discharge on the microstructure and electrical properties of insulation paper in AC/DC environment needs to be analyzed, in order to evaluate the performance of oil-impregnated insulation paper in converter transformers. In this paper, the discharge damage test platform of oil-impregnated insulation paper under AC/DC composite voltage was built. The changes of microstructure and electrical properties of materials under different composite voltages and their mutual correlation mechanism were explored. The results show that under different composite voltages, the degradation mechanism of microstructure and electrical performance are consistent. Partial discharge will cause the microscopic surface of the insulation paper to be gradually damaged, accompanied with the breakage of glycosidic bonds in cellulose, the production of carboxyl solid materials. The parameters of the insulation paper, such as dielectric constant, conductivity and dielectric loss, increase. Due to the influence of the distribution law of the complex voltage and the space charge, the increase of DC voltage ratio will slow down the deterioration of the microstructure and electrical properties of the insulation paper.

关 键 词：油浸绝缘纸 局部放电 交直流复合电压 微观结构 电气性能 

分 类 号：TM855[电气工程—高电压与绝缘技术]