山区复杂地形条件下输电线路雷击跳闸故障分析方法

Analysis on the Lightning Trip-out Failure of Transmission Line Under Conditions of Complex Landscape in a Mountainous Area

为提高山区输电线路防雷水平,揭示部分已安装塔顶避雷针或避雷线侧针保护失效原因,应加强对雷击点位置的诊断分析。基于雷电定位系统监测数据,利用三维地理信息系统扫描提取的故障杆塔邻近档距精细地形地貌数据,建立全档距三维全景复现防雷性能计算模型,仿真故障时刻状态,分析确定故障性质和雷击点范围,并考虑邻近杆塔绝缘水平差异和防雷措施保护范围的影响校核雷击点区间。运用该方法对发生在山区的典型故障进行三维全景复现,得到的分析结果能够较好地与故障情况吻合,并且量化解释了部分现有防雷措施失效的原因,对后续防雷改造具有显著的工程指导意义。

In order to technology and economy protection, and reveal the improve the performance of for improvement of lightning failure cause of controllable discharging lightning rods and side needles, the incidence range of lightning current should be analyzed carefully. This paper proposed the calculation of whole-span lightning protection performance to simulate the status of the fault time, based on the lightning detection data, and the accurately topography and geomorphology data acquired by 3D geography information system （GIS）. Through this simulation method, the fault property and the incidence range of lightning shielding failure current can be obtained. Moreover, the insulation configuration differences of adjacent towers and the protection range of lightning protection measures can be considered to verify the incidence range of lightning shielding failure current. This method has been verified by the typical fault in the mountain. In this example, the reason of lightning protection measure failure also has been explained quantitatively. The analysis result can be applied to the improvement of lightning protection.