摘要
云广±800 kV特高压直流输电线路工程是世界上第1个±800 kV、输电容量5 GW的特高压、大容量直流输电工程。所处地区属于雷击多发、易发区,防雷任务十分艰巨。为此结合特高压输电线路特点,建立了基于ATP-EMTP仿真软件的特高压直流输电线路反击仿真模型;依据改进电气几何模型,建立输电线路的屏蔽模型。计算结果表明:云广线路反击耐雷水平较高,反击闪络率较低;绕击闪络率较高,应该在云广线路中采用负的保护角;当杆塔升高到很高(>60 m),或地面倾角很大(>20°)时,应该考虑采用安装防绕击避雷针,架设耦合地线等防雷措施。
Yun-guang ±800 kV UHVDC power transmission line is the first UHVDC project with ±800 kV voltage and 5 million kW capacity in the world. Lightning protection for the transmission line is arduous for the severe lightning stroke in the area. Based on ATP-EMTP,EGM, models of lightning withstand performances for back striking and shielding failure for UHVDC transmission line are established. Research results show that back striking withstand performance is better than shielding failure withstand performance in Yun-guang ± 800 kV UHVDC power transmission line, and the negative shielding angle should be adopted because the principal cause of lightning stroke failure is the shielding failure. Other measures for lightning protection such as lightning rod for shielding failure and coupling ground wire should be installed when the tower is excessively high（higher than 60 m） or the ground obliquity is excessively large（larger than 20°）.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2008年第10期2086-2089,共4页
High Voltage Engineering
基金
中国南方电网有限责任公司重点项目(200710)~~
