1000kV特高压交流输电线路双回耐张塔刚性跳线电晕抑制分析  

Corona Suppression Analysis of Rigid Jumper in Double-circuit Tension Tower for 1 000 kV Ultra High Voltage AC Transmission Line

作　　者：杨熙[1] 王青于 廖晋陶[1] 李乃一[1] 杜进桥[1] 彭宗仁[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高电压技术》2014年第6期1839-1846,共8页High Voltage Engineering

基　　金：国家电网公司科技项目(编号略)~~

摘　　要：特高压交流1 000 kV双回耐张塔结构复杂,为分析其刚性跳线表面电场分布,并抑制电晕放电,运用3维有限元分析软件ANSYS,考虑了杆塔、金具、绝缘子串等因素和相间影响,计算了特高压双回耐张塔采用铝管式结构时刚性跳线的表面电场分布,对比分析了跳线表面场强的不同影响因素;并选取特高压试验示范工程典型单回耐张塔JTP3,通过电场仿真计算结合实地电晕测量,确定了特高压双回耐张塔刚性跳线表面场强的控制值;最后研究了跳线表面场强随弧垂值、耐张塔转角度数以及跳线直径的变化规律。研究结果表明:相间影响对中相跳线表面场强影响相对较大,杆塔、大地以及回间影响对中相跳线表面场强的影响百分比<5%,特高压双回耐张塔刚性跳线表面场强控制值可取为2 600 kV/m,刚性跳线应选用JL/G3A-900/40型导线并在实际安装中应使弧垂值控制在<0.2 m。The structures of double-circuit tension towers used in 1 000 kV ultra high voltage AC transmission lines are complex. To analyze the electric field distribution on the surface of the rigid jumpers to inhibit the corona discharge on the tension tower, we calculated the electric field distribution on the surface of the aluminum-tube rigid jumper and compared the factors influencing the distribution on jumper. Taking the effect of tower, fittings, insulator strings, and phase into consideration, we conducted the calculation using ANSYS. Then, using JTP3, the single-circuit tension tower in the 1 000 kV AC pilot project, as an example, we determined the tower＇s electric field strength standard through electric field calculation and field corona measurement. Lastly we studied the variation of the electric field distribution on the jumper surface with the changes of sag height, angle of tower and jumper diameter. The results show that, the influence of phase is more significant, meanwhile the tower, ground, and another circuit influence the electric field distribution by less than 5%. The critical value of the electric field can be determined as 2 600 kV/m. It is suggested to use JL/G3A-900/40 as the rigid jumper while assuring the sag height is less than 0.2 m.

关 键 词：特高压 双回耐张塔 刚性跳线 电场分布 有限元法 电晕测量 

分 类 号：TM751[电气工程—电力系统及自动化]