±500kV直流输电线路耐雷性能研究  

Study on Lightning Withstand Performance of ±500 kV DC Transmission Lines

作　　者：胡斌[1] 郭洁[1] 万帅[2] 金青[3] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [3]西安电力高等专科学校,西安710032

出　　处：《电瓷避雷器》2013年第2期94-98,共5页Insulators and Surge Arresters

摘　　要：直流架空输电线路的耐雷特性不同于交流系统,特高压直流输电线路杆塔高、跨度大,且工作电压幅值、极性不变,使得雷击直流高压输电线路的概率增大,有必要对直流架空输电线路耐雷性能进行研究。针对近年来葛南±500 kV直流输电线路多发的雷击故障,以葛南±500 kV直流单、双回架空输电线路为工程背景,采用ATP-EMTP和电气几何模型法分别对线路的反击和绕击耐雷性能进行了仿真计算研究,并与交流输电线路耐雷性能进行了分析比较。研究表明:±500 kV直流输电线路的雷电绕击跳闸率远高于反击跳闸率;工作电压对雷电先导发展、建弧率以及导线绕击距的影响比交流更大,使得直流输电线路正极性导线的雷击跳闸率高于负极性。The lightning withstand performance of DC transmission system is different from AC transmission system, it has the following characteristics： higher tower, large span of transmission lines, high voltage and to maintain the same polarity which make it vulnerable to lightning, there is a need for DC transmission line lightning withstand performance research. According to Ge-Nan DC transmission line lightning fault occurs frequently in recent years, Taking the ＋500kV HVDC circuit transmission lines as the engineering background, study the back flashover and shielding failure performance by using ATP- EMTP and EGM method, further make a comparative analysis with the AC lightning withstand perfor- mance. It is generally believe that the ＋500kV DC transmission lines lightning shielding failure rate much higher than the back striking trip-out rate. Compared with the AC transmission lines, the DC oper- ating voltage plays a significant role in promoting the development of the lightning leader, improving the arc building rate and increasing the conductor shielding striking distance. As a consequence, the lightning trip-out rate of positive conductor of DC transmission lines is much higher than negative conductor.

关 键 词：ATP-EMTP 直流架空输电线路 反击 绕击 耐雷水平 雷击跳闸率 

分 类 号：TM863[电气工程—高电压与绝缘技术]