采用六相输电技术优化双回高压输电线路电磁环境的研究  

Improving the electromagnetic environment of a double-circuit high-voltage transmission line using the six-phased technology

作　　者：葛小宁 庞福滨 嵇建飞 邹军[1] GE Xiaoning;PANG Fubin;JI Jianfei;ZOU Jun(State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Dept. of Electrical Engineering,Tsinghua University),Beijing 100084,China;State Grid Jiangsu Electric Power Co.,Ltd. Research Institute,Nanjing 211103,China)

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京100084 [2]国网江苏省电力有限公司电力科学研究院,江苏南京211103

出　　处：《电力工程技术》2019年第1期1-5,共5页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51577103);电网环境保护国家重点实验室开放基金资助项目(GYW51201700-589)

摘　　要：随着输电线路电压等级的提升,特高压线路电磁环境问题已成为决定其杆塔尺寸的主要因素之一。文中对1 000 k V特高压双回线路和六相578 k V线路的电磁环境进行了计算和比较,结果显示采用同样的塔头和呼高情况下,六相线路的电磁环境优于三相线路。文中还研究了六相线路电磁环境随呼高的变化规律,地线及距地面最高的两根输电线的表面场强随呼高降低而降低,其余导体表面场强随呼高降低而增加;线路下方地面附近工频电场强度、无线电干扰及可听噪声均随着呼高的降低而增加。相比于同等相电压等级的三相线路,其导线表面电场强度更小。因此,六相输电可有效改善双回交流线路的电磁环境。As the rated voltage of the transmission line increases, the electromagnetic environment of ultra-high voltage transmission lines has become one of the main factors to determine the tower size. The comparison of the electromagnetic environment is analyzed between the 1 000 kV three-phase double-circuited transmission line and the six-phased 578 kV. The numerical results show that the electromagnetic environment of a six-phased transmission line is much improved with the same tower configuration and nominal tower height. Further more, the characteristic of the electromagnetic environment of a six-phased transmission line with respect to the nominal tower height is studied in detail. With the decrease of nominal height, the electric field strength on the surface of the ground wire and the two highest transmission lines decreases, while that of the other conductors increases. The ground-level electric field, radio interference and audible noise increases as the nominal height decreases. In comparison with a three-phased transmission line with the same phase voltage, the electric intensity on the surface of the conductor of the six-phased transmssion line is much lower than that of the three-phased ones. The six-phased technology of the transmission line can essentially improve the electromagnetic environment of the high-voltage AC transmission lines.

关 键 词：特高压 六相输电线路 三相双回线路 电磁环境 呼高 

分 类 号：TM75[电气工程—电力系统及自动化]