精细化地形地貌影响因子下杆塔绕击跳闸率计算及治理方案决策  

Shielding Failure Trip-out Rate Calculation and Lightning Protection Strategy Making Based on More-refined Topography Influence Factor

作　　者：吴敏[1] 赵淳[1] 谷山强[1] 林卿[1] 周航[1] 王韬[1] 

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,武汉430074

出　　处：《电瓷避雷器》2015年第3期84-88,95,共6页Insulators and Surge Arresters

摘　　要：输电线路沿线地形地貌分布情况将对线路本体的雷害防护水平产生较大影响,同一基杆塔外坡侧导线相比于内坡侧更易被雷电绕击,山顶处杆塔雷击概率远大于平地杆塔,为将该因素考虑到线路防雷仿真计算中,规程法及电气几何模型均定义了相应概念及参数,但计算结果表明,其均难以达到高精度雷击跳闸率计算要求。为此,提出一种基于分段地形的导线跳闸率计算及评估方法,其以高精度地形地貌数据为基础,通过深度挖掘获取坐标、海拔、高程差、坡度等信息。以线路走向为基准线,杆塔左右侧地面为研究对象,分8点精确计算导线侧地面倾角,实现线路引雷范围内地形地貌高度还原。取左右两侧4点地面倾角平均值为导线侧地面倾角实际值,融入杆塔雷击跳闸率计算中,进而实现计算结果精度的大幅提升及雷害风险等级的准确评估。最后,以各相导线跳闸率计算结果为依据、改造金额及改造目标为前提,制定针对导线最优差异化防雷治理策略,为线路改造提高可靠指导,并证明了该方法的有效性。The geographic and geomorphic conditions along the line will make a large affection on the lightning protection level of transmission line. The wire which is outside the slope is more likely to be struck by lightning than the one at inner slope, and the lightning probability of mountaintop tower is higher than to the ground tower. In order to consider topography factors into simulation calculation of lightning protection, GUI and EGM both define the relevant concepts and parameters. But the calculation results show that they are hard to meet the accuracy requirements. Therefore, a new shielding failure trip-out calculation and evaluation method based on the section of topography. Dingging deeper into internal information to get multidimensional parameters, such as coordinates, elevation, elevation and slope. Then consider transmission line as the center line and calculate ground beside the line as the research object. Cut both sides of the ground into eight pieces and get their ground tilt angle values. Take average values of the ground tilt at 4 points on left and right sides as the actual values for ground angle at the wire side, and put it into the tower lightning trip-out rate calculation. Finally, make the optimal differentiation lightning protection strategy for wires based on the calculation results of conductors tripping rate for each phase, on the premise of transformation costs and transformation goals, the reliable guidance for line modification is provided, and the effectiveness of the proposed method is proved.

关 键 词：电气几何模型 地形地貌 地面倾角 治理方案 差异化 

分 类 号：TM863[电气工程—高电压与绝缘技术]