高海拔地区±400kV直流线路型避雷器设计  

Design of ±400kV DC Line Arrester in High Altitude Area

作　　者：曹伟 万帅 谷山强[1,2] 陈家宏 王剑[3] 杜雪松 CAO Wei;WAN Shuai;GU Shanqiang;CHEN Jiahong;WANG Jian;DU Xuesong(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,Jiangsu Province,China;Hubei Key Laboratory of Power Grid Lightning Risk Prevention(Wuhan NARI Limited Company,State Grid Electric Power Research Institute),Wuhan 430074,Hubei Province,China;State Grid Corporation of China,Xicheng District,Beijing 100031,China)

机构地区：[1]南瑞集团有限公司(国网电力科学研究院有限公司),江苏省南京市211106 [2]电网雷击风险预防湖北省重点实验室(国网电力科学研究院武汉南瑞有限责任公司),湖北省武汉市430074 [3]国家电网有限公司,北京市西城区100031

出　　处：《电网技术》2020年第1期347-353,共7页Power System Technology

基　　金：国家电网公司总部科技项目(WNJ151-0006)~~

摘　　要：±400 kV青海柴达木—西藏拉萨直流输电线路(简称柴拉线)是西藏电网的主受电通道,是国内外第一条途径5000m海拔等级地区的直流输电线路。为有效提高其抵御雷害风险的能力,结合现行的交直流线路避雷器技术标准,针对高海拔地区环境要求,设计了±400kV直流线路避雷器的结构型式和关键技术参数,并进行了试验验证。研究结果表明:±400kV直流线路避雷器的额定电压为±480 kV,标称放电电流为20kA,雷电冲击放电电压≤2100 kV,雷电冲击残压≤960 kV,外绝缘的统一爬电比距≥32.5 mm/kV,直流湿耐受电压为480 kV,复合外套的雷电冲击耐受电压为1344 kV和直流湿耐受电压为480 kV,统一空气串联间隙距离为2.8~3.2 m。研制的±400 kV直流线路避雷器填补了高海拔直流线路避雷器的技术空白,为该避雷器在±400 kV柴拉线上的推广应用打下了基础。The ±400 kV transmission line from Chaidam,Qinghai to Lhasa,Tibet(Chaidam-Lhasa line)is the main power receiving channel of Tibet Power Grid,and also the first DC transmission line over the world crossing 5000m altitude region.In order to improve its ability to withstand the risk of lightning damage effectively,the structure type and technical parameters of the line arrester used in this line was analyzed according to current technical standards for AC/DC line arresters and high-altitude environmental requirements.The key technical parameters of ±400kV DC line arrester were designed,calculated and verified with tests.Its key technical parameters are:rated voltage 480 kV,nominal discharge current 20kA,lightning impulse discharge voltage≤2100 kV,residual voltage≤960 kV,unified specific creepage distance≥32.5mm/kV,DC wet withstand voltage 480 kV,polymer lightning impulse discharge withstand voltage 1344 kV,and polymer DC wet withstand voltage also 480 kV.In addition,the unified air series gap distance is 2.8~3.2 m.Development of ±400kV DC line arrester fills the technical gap of high-altitude DC line arrester,laying a foundation for popularization and application of the arrester on ±400kV Chaidam-Lhasa line.

关 键 词：±400kV柴拉线 高海拔 线路避雷器 海拔修正 雷电冲击放电电压 直流湿耐受电压 

分 类 号：TM86[电气工程—高电压与绝缘技术]