500kV交流线路并联间隙电场分布和电极结构优化  

Study on Electric Field Distribution and Electrode Structure Optimization for 500kV AC Transmission Line Parallel Gap

作　　者：彭波[1] 方玉群 许衡[3] 赵淳[3] 梁加凯 黄瑞莹 苏杰[3] 任华[3] 

机构地区：[1]国家电网公司,北京100031 [2]国网浙江省电力公司金华供电公司,浙江金华321000 [3]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [4]武汉大学电气工程学院,武汉430072

出　　处：《电瓷避雷器》2017年第5期113-117,127,共6页Insulators and Surge Arresters

基　　金：国家电网公司科技项目(编号:5211JH1500X7)

摘　　要：并联间隙装置能保护绝缘子免受工频电弧的灼烧损坏,降低输电线路的雷击事故率,对于高压输电线路防雷保护具有重要意义,但目前并联间隙在500kV输电线路应用较少。因此利用有限元法分析,建立双回单联I型串输电线路三维静电场模型,计算新型环形组合电极结构对绝缘子串电场影响,通过比较绝缘子串及电极表面电场值,与并联间隙导则安装的电极结构进行对比。在此基础上,对新型电极结构下的绝缘子端部电场进行优化。计算结果表明,新型并联间隙电极未加装均压环时,表面最大场强值较按导则安装的电极结构好;在加装均压环后,绝缘子低压端护套最大场强为3.87kV/cm,高压端护套最大场强为5.73kV/cm,均降低至6kV/cm以下。给出了一种较优的结构尺寸参数,对并联间隙电极设计和应用具有一定指导意义。Parallel gap is a device which can protect insulator from the burn of power frequency follow current, and reduce the lightning strike rate of transmission lines, which is of great significance for highvoltage transmission line lightning protection. But the application is still little in 500kV transmission line. Therefore, the finite element method is used to analyze the three-dimensional electrostatic field model of the double-loop single-I-type string transmission line, and the influence of the new ring-shaped elec- trode structure on the electric field of the insulator string is calculated. By comparing the insulator string and the electrode surface electric field value, compared with the electrode structure of the parallel clearance guide. On this basis, the electric field of the insulator under the new electrode structure is optimized. The results show that the maximum field strength of the new parallel - gap electrode without grading ring is better than that of the guide electrode. After installing the grading ring, the maximum field strength of the insulator low voltage side housing is 3.87 kV / cm, and the maximum field strength of the high voltage side housing is 5.73 kV / cm, which is reduced to below 6 kV / cm. A better structural dimension parameter is given, which has some guiding significance for the design and application of parallel gap electrode.

关 键 词：500kV交流线路 并联间隙 电极结构优化 有限元法 电场分布 

分 类 号：TM863[电气工程—高电压与绝缘技术]