基于雷电定位系统和实测的多回击地闪雷电流参数及模型分析

Analysis of Lightning Current Parameters and Model Based on Lightning Location System and Measured Multi-return Stroke of Cloud-to-ground Lightning

多回击地闪可能造成同一输电线路连续遭受多次雷电冲击,进而引起线路重合闸失败,以及变电站内断路器和避雷器等设备事故。传统以单次雷击设计线路和变电站雷电防护的方法已不足以对现有输电线路和变电站进行很好的防护。为此,依据广东省内12年雷电定位系统数据及人工引雷数据,研究多回击地闪雷电流参数及模型,为线路和变电站的雷电防护提供基础参数和模型。广东地区12年内雷电定位数据统计分析表明:多回击地闪占比为52.58%,而负地闪占多回击地闪的96.84%;正负极性多回击地闪平均频次为2.2和4.1次,时间间隔的平均值分别为140 ms和103 ms;对此提出负极性雷电流幅值概率分布公式。最后,结合人工引雷试验的后续雷击雷电流波形参数及拟合函数、IEEE和GB 50057—2010标准等推荐的首次回击的波形参数,提出可以应用于防雷设计的多回击地闪雷电流参数及模型。

Multi-return stroke of cloud-to-ground(CG) lightning may cause the same transmission line suffer multiple lightning impulse,and then lead to the failure of line reclosure as well as equipment accidents of circuit breakers and arresters in the substation.The traditional lightning protection design method based on single lightning strike is not enough to protect the existing transmission lines and substations well.Therefore,according to the data from the lightning location system in 12 years and artificial triggering lightning in Guangdong province,this paper studies the lightning current parameters and models of multi-return stroke of CG lightning,providing basic parameters and models for lightning protection of lines and substations.The statistical analysis of lightning location data in Guangdong in the past 12 years shows that the proportion of multi-return stroke of CG lightning is 52.58%,while the negative multi-return stroke of CG lightning accounts for 96.84% of the multi-return stroke of CG lightning.The average frequency of positive and negative multi-stroke of CG lightning is 2.2 and 4.1,and the average time interval is 140 ms and 103 ms,respectively.Thus,the paper proposes the probability distribution formula of the negative polarity lightning current amplitude.Finally,combined with the waveform parameters and fitting function of the subsequent lightning current from the artificial triggering test and the waveform parameters of the first return stroke recommended by IEEE and GB 50057—2010,this paper proposes the parameters and model of the lightning current with multiple return strokes of CG lightning,which can be applied in lightning protection design.