750kV输电线路复合横担均压特性  

Voltage-Sharing Characteristics of Composite Cross-Arm in 750 kV AC Transmission Lines

作　　者：杨熙[1] 喻新强 尚勇 朱岸明 杜进桥[1] 施荣 范传杰[1] 龚兴国 彭宗仁[1] 

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 [2]西北电网有限公司,陕西省西安市710048 [3]陕西省电力公司规划评审中心,陕西省西安市710065

出　　处：《电网技术》2013年第6期1625-1631,共7页Power System Technology

基　　金：国家电网公司基建项目~~

摘　　要：复合横担首次应用于国内750 kV线路,由于电压等级高,结构复杂,均压、均场问题突出,需要对其均压特性进行深入研究。运用三维有限元分析软件ANSYS,考虑杆塔、大地、导线以及相间影响等因素,计算了复合横担在不同设计方案下的电位、电场分布,研究了中间法兰以及横担端部配置均压环、屏蔽环对复合横担电位分布的影响,对比了750 kV线路直线塔绝缘子串与复合横担的电位分布。复合横担最终选择在最初设计方案的基础上取消悬垂串、增加横担长度并配置合理的均压屏蔽装置的方案,其电位分布优于750 kV线路直线塔。经过中国电力科学研究院电气试验验证,复合横担电气性能良好,满足运行要求。It is the first time in China to apply composite cross-arms in 750kV AC transmission system, and in view of its high voltage grade and complex structure the uneven distribution of potential and electric field in 750 kV AC transmission system have to be researched in depth. Utilizing three-dimensional finite element analysis software ANSYS and considering influences of such factors as tower, earth, wires and inter-phase interaction, the distributions of potential and electric field under different design schemes are researched, and the influences of spacer flange and grading ring and sharing ring, which are configured at the terminals of the cross-arm, on potential distribution on composite cross-arm, meanwhile the potential distribution on insulator string for 750kV suspension tower and the potential distribution on composite cross-arm are contrasted. Based on the first design scheme of the cross-arm, a final scheme for the composite cross-arm is chosen, in which the suspension insulator string is canceled, the length of composite cross-arm is prolonged and the grading and shielding devices are configured reasonably, thus the potential distribution of the composite cross-arm is better than that of suspension tower. Verification results of electrical tests performed by China EPR1 show that the composite cross-arm adopting the finally chosen scheme possesses good electrical performances that can meet operational requirements.

关 键 词：复合横担 均压特性 750KV输电线路 有限元 电位分布 均压环 电气试验 

分 类 号：TM726[电气工程—电力系统及自动化] TM854