500 kV超高压直流穿墙套管有限元三维电场分析  

Finite Element Three-Dimensional Electric Field Analysis of 500 kV EHV DC Wall Bushing

作　　者：曾令文 ZENG Lingwen(Tianshengqiao Bureau EHV transmission company of China Southern Power Grid,Xingyi 562400,China)

机构地区：[1]中国南方电网超高压输电公司天生桥局,贵州兴义562400

出　　处：《电瓷避雷器》2021年第2期53-58,共6页Insulators and Surge Arresters

摘　　要：对±500 kV超高压直流穿墙套管电场进行研究。首先建立±500 kV超高压干式直流穿墙套管模型,分别讨论了套管的结构特点和绝缘性能。其次利用有限元仿真软件Ansoft Maxwell计算了穿墙套管的三维电场分布,重点分析了套管外绝缘厚度和端部均压环及中部屏蔽环对套管电场分布的影响。然后根据实验数据提出了优化思路和改进方向。结果表明:套管高场强区集中在屏蔽层翻边位置及套管两端端头位置,使用均压环和屏蔽环能有效提高套管绝缘稳定性。The electric field of ± 500 kV EHV DC wall bushing is studied. Firstly,the model of ± 500 kV EHV dry-type DC wall bushing is established,and the structural characteristics and insulation performance of the bushing are discussed respectively. Secondly,the three-dimensional electric field of wall bushing is calculated by Ansoft Maxwell,and the influence of insulation thickness,grading ring and middle shielding ring on electric field distribution is analyzed. According to the experimental data,the optimization idea and improvement direction are proposed. The results show that the high field strength area of the bushing is concentrated in the flanging position of the shielding layer and the ends of the casing.The use of grading ring and shielding ring can effectively improve the insulation stability of the bushing.

关 键 词：超高压穿墙套管 三维电场 有限元 SF^(6)气体 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM216.5[一般工业技术—材料科学与工程]