1次人工触发闪电引起的临近地网电位升高及其特征分析

发布时间：2018-01-05 08:00

本文关键词：1次人工触发闪电引起的临近地网电位升高及其特征分析　出处：《高电压技术》2017年05期 　论文类型：期刊论文

【摘要】：为了研究近距离闪电发生时临近地网地电位升高的电压特征,对1次触发闪电过程中2个相距40 m的地网地电位升高电压的观测数据进行了分析。研究结果表明:(1)3次回击对应的地电位升高电压峰值范围为-9.0kV~-15.4 kV,均在亚μs时间内快速下降形成次峰,下降幅度分别为51.1%、51.9%和53.9%,之后缓慢下降;(2)11次M分量引起的地电位升高电压峰值范围为-0.3 kV~-3.0 kV,平均为-1.0 kV;10%~90%上升时间范围为14.0μs~776.6μs,平均为190.7μs,与对应触发闪电电流特征基本一致;半峰宽度范围为49.6μs~1 005.4μs,平均为317.9μs,是对应雷电流参数平均值的1.5倍;(3)回击过程地电位升高电压峰值与雷电流峰值及雷电流陡度的相关系数分别为0.96和0.98,回击阶段的地电位升高是由雷电流在土壤中的泄放和感应耦合共同作用的结果;M分量过程地电位升电压峰值与雷电流峰值及雷电流陡度的拟合系数分别为0.99和0.73,M分量引起地网地电位升高主要是由雷电流在土壤中的泄放引起的,感应耦合的作用是第2位的。长连续电流叠加M分量会使临近地网的地电位升高电压长时间维持在较高水平,这是临近地网地电位反击导致浪涌保护器(SPD)损坏的重要原因。
[Abstract]:In order to study the voltage characteristics of the ground potential rise in the near ground network when the lightning occurs at close range. In this paper, the observed data of the rising voltage of earth potential of two ground grids with a distance of 40 m during a lightning trigger are analyzed. The peak range of ground potential rise voltage corresponding to three backstrokes is -9.0 kV / -15.4 kV. In the time of sub-渭 s, the second peak was formed by the rapid decrease, which was 51.9% and 53.9%, respectively, and then decreased slowly. The peak range of ground potential rise voltage caused by 11 M components is -0.3 kV~-3.0 KV, with an average of -1.0 KV. The rising time range of 10 ~ 90% is 14.0 渭 s ~ 776.6 渭 s, with an average of 190.7 渭 s, which is basically consistent with the characteristics of the corresponding triggered lightning current. The width of the half-peak is 49.6 渭 s / 1 005.4 渭 s, with an average of 317.9 渭 s, which is 1.5 times of the average lightning current parameter. 3) the correlation coefficients between the peak voltage of ground potential and the peak value of lightning current and the lightning current steepness are 0.96 and 0.98, respectively. The rise of ground potential in the return stroke stage is the result of the combined action of lightning current releasing and induction coupling in the soil. The fitting coefficients of peak voltage of ground potential and lightning current and lightning current steepness in M component are 0.99 and 0.73, respectively. The increase of ground potential caused by M component is mainly caused by the discharge of lightning current in soil. The inductive coupling action is the second position. The long continuous current stack M component will make the ground potential rise voltage of the adjacent ground network to be maintained at a higher level for a long time. This is an important reason for the damage of surge protector SPD.
【作者单位】：中国气象局广州热带海洋气象研究所广东省区域数值天气预报重点实验室;中国气象科学研究院灾害天气国家重点实验室;
【基金】：灾害天气国家重点实验室基金(2016LASW-B09) 国家重点基础研究发展计划(973计划)(2014CB441405) 国家自然科学基金(51420105011)~~
【分类号】：TM862
【正文快照】： 0引言在雷电防护系统中,地网是不可或缺的重要组成部分,它能将雷电流安全快速地泄放入大地,起到保护建(构)筑物及其内部人员、设备不受雷电直接危害的作用。但地网在泄放频率和幅值都较大的雷电流时,会产生很高的地电位,会对与之相连的设备以及附近的人畜产生反击,极易造成重

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