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电网技术  2014 

大尺寸特高压输电线路雷电屏蔽性能模拟试验影响因素

DOI: 10.13335/j.1000-3673.pst.2014.05.040, PP. 1385-1389

Keywords: 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

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Abstract:

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20/2500μs和负极性80/2500μs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1000kV特高压线路SZ322型杆塔开展了模型比例为112.5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。

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