雷电流在接地网上的暂态电位差研究

Research on Transient Potential Difference of Lightning Current on Grounding Grid

为了研究雷电流经过雷达阵地接地网时产生的最大电位差,根据接地网中雷电暂态的计算方法,给出了接地分支的电气参数计算公式;采用π型电路表示接地分支的分段单元,建立了接地网的等效电路模型.利用电磁暂态分析程序(ATP-EMTP)仿真法对不同结构的水平接地网在脉冲电流下的冲击特性进行分析,得出不同接地体的结构对接地网上最大地电位差的影响.采用类似田字型结构地网及在地网中心接入装备保护地可使分置装备之间因接地产生的电位差最小.该结论具有实用推广价值.

For purpose of discussing the maximum ground potential difference caused by lightening current flowing through grounding grid of the radar position,this paper gives a formula for computing the electrical parameters of grounding branches by computing method of lightning transient current on grounding grid,and construct an equivalent circuit model of the grounding grid using π-type circuits to represent segmentation unit of those grounding branches.The impacts of various grounding configuration on the maximum potential differences on the grid are picked out,by employing the simulation of alternative transients program-elector-magnetic transient program（ATP-EMTP） to analyze the impulse characteristics of horizontal grounding grid with different structure.Finally,it comes to a conclusion that the potential difference produced by grounding of various separate installation can be minimized by using the grounding grid with configuration similar to Chinese character‘田’and grounding the equipment protection in the center of grounding grid.And the conclusion is of availability.