两回±800kV特高压直流线路交叉跨越时的地面合成电场计算及设计应用  

Calculation and Design Application of Ground Total Electric Field Generated by Two Crossing ±800 kV UHVDC Transmission Lines

作　　者：谢莉 黄韬 陶莉 杨勇[3] 赵录兴 XIE Li;HUANG Tao;TAO Li;YANG Yong;ZHAO Luxing(China Electric Power Research Institute,Beijing 100192,China;Electric Power Research Institute of State Grid Hunan Electric Power Company,Changsha 410007,China;College of Electrical Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]国网湖南省电力有限公司电力科学研究院,长沙410007 [3]河南工业大学电气工程学院,郑州450001

出　　处：《南方电网技术》2021年第10期12-17,共6页Southern Power System Technology

基　　金：国家电网公司科技项目“两回交叉跨越直流输电线路地面合成电场三维预测和控制技术研究”(GYB17201800203)。

摘　　要：采用三维方法计算交叉跨越直流输电线路的地面合成电场,并将计算结果与架设4×95 mm2导线的交叉跨越直流试验线段的试验结果进行对比,验证计算方法的有效性。采用该方法分析实际两回交叉跨越±800 kV直流线路的导线表面电场、地面标称电场和地面合成电场分布情况。通过计算导线对地高度、垂直极间距对地面合成电场最大值的影响,给出满足电磁环境要求的导线最小对地高度和垂直极间距。研究结果和研究思路可为交叉跨越超/特高压直流线路的设计提供技术支撑。The 3-D method is used to calculate the ground total electric field of two crossing HVDC transmission lines. By the comparison of the calculated results and the measured data on the crossing test lines with the bundles of 4×95 mm2, the method is verified. Then the 3-D method is applied to the problem of practical crossing ±800 kV UHVDC transmission lines, including the distribution analysis of the voltage gradients on the conductor surface, the ground nominal electric field and the ground total electric field. Finally, the influence of the lower conductor height and the vertical polar distance on the maximum of the ground total electric field is discussed, and the minimal values of the lower conductor height and the vertical polar distance are recommended to meet the requirement of the electricmagnetic environmental protection standards. The results and approaches can provide technical support for the design of crossing HVDC and UHVDC transmission lines.

关 键 词：地面合成电场 导线电晕 三维方法 交叉跨越直流线路 高压直流 

分 类 号：TM862[电气工程—高电压与绝缘技术]