云广±800kV特高压直流输电线路绕击模拟试验  

Shielding Failure Simulation Experiment on the Lightning Performance of Yunguang ±800kV UHVDC Transmission Lines

作　　者：杜忠东[1] 尚涛[2] 张成巍[1] 

机构地区：[1]国网电力科学研究院,武汉430074 [2]中国南方电网有限公司,广州510000

出　　处：《高电压技术》2008年第10期2090-2096,共7页High Voltage Engineering

基　　金：中国南方电网有限责任公司重点项目(200710)~~

摘　　要：为了研究±800 kV特高压直流输电线路绕击性能,指导云广±800 kV特高压直流输电工程建设,通过模型试验模拟了云广±800 kV特高压直流输电线路中工作电压、保护角、地面倾角等因素对绕击性能的影响并采用统计的方法对影响云广±800 kV特高压直流输电线路的各种因素进行了分析,同时也对防绕击预放电避雷针的防雷效果进行了模拟试验。试验得出:正极性工作电压下,线路的屏蔽性能差,绕击率大,地面倾角和保护角增大时,绕击率随之增大;防绕击预放电避雷针可以有效地降低绕击率,建议在云广±800 kV特高压直流输电线路中推广使用。In order to accomplish the project of the lightning protection design of the Yunguang ±800 kV UHVDC Transmission Lines, the authors simulate influential factors such as working voltage, protection angle, ground elevation in the test model to analyze their effects on the shielding failure rate. A statistical method is used in the treatment of experimental results to get the influences of the factors on the shielding failure rate and to obtain the lightning performance of shielding failure-protection predischarge lightning rod. Through analyzing the experimental data, conclusions can be drawn as follows： polarity and magnitude of the working voltage, ground elevation have great influences on the lightning performance, and the shielding failure-protection predischarge lightning rod can be widely applied to the YUN-GUANG UHVDC transmission lines due to the fact that test results can decrease the shielding failure rate effectively.

关 键 词：绕击 保护角 地面倾角 避雷针 概率 特高压 

分 类 号：TM726.1[电气工程—电力系统及自动化]