大尺寸特高压输电线路雷电屏蔽性能模拟试验影响因素  

Impacting Factors of Large-Sized Model Test for Lightning Shielding Performance of UHV Transmission Lines

作　　者：安韵竹[1] 蓝磊[1] 文习山[1] 王羽[1] 戴敏[2] 李志军[2] 叶奇明[2] 鄂胜龙 陈文广[1] 陈子涵[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]中国电力科学研究院,湖北省武汉市430074

出　　处：《电网技术》2014年第5期1385-1389,共5页Power System Technology

摘　　要：输电线路雷电屏蔽性能模拟试验研究是线路雷电防护研究的重要手段。根据实际观测的雷电梯级先导停滞时间,确定采用负极性20/2 500?s和负极性80/2 500?s两种操作冲击电压波形模拟雷电最后一击的放电过程,针对1 000 kV特高压线路SZ322型杆塔开展了模型比例为1:12.5的大尺寸雷电屏蔽性能模拟试验。试验结果表明:导线接地方式明显影响导线的放电被击概率;正极性偏置电压将增大导线的放电被击概率,负极性偏置电压将减小导线的放电被击概率;波头时间对放电路径影响不明显;导线被击概率随着线路保护角的增大而增大。所得结果为后续特高压线路雷电屏蔽性能试验的开展提供参考借鉴。The model test based study on lightning shielding performance of transmission lines is an important means for the research on lightning protection of transmission lines. According to the observed dead time of lightning stepped leader, two switching impulse waveforms with negative polarity, they are 20/2 500 gs and the 80/2 500 gs respectively, are adopted to simulate the final stage of lightning strike, and using the tower type of SZ322 for 1 000 kV ultra high voltage （UHV） with the scaling of 1：12.5 a large-sized simulation test of lightning shielding is performed. Test results show that the lightning struck probability of transmission line is obviously influenced by the grounding mode of transmission line; the lightning struck probability of transmission line increases under DC bias voltage with positive polarity and decreases under DC bias voltage with negative polarity; the influence of the wave front duration on discharge path is not evident; the lightning struck probability of transmission line increases with the increasing of protective angle. The obtained results are available for reference to the follow-up lightning shielding performance tests for UHV transmission lines carried out in the future.

关 键 词：雷电屏蔽性能试验 特高压 大尺寸 接地方式 工作电压 波头时间 保护角 

分 类 号：TM863[电气工程—高电压与绝缘技术]