10kV配电线路差异化防雷研究

Study on differentiated lightning protection for 10 kV distribution lines

配电线路易遭受感应雷过电压而发生雷害事故,在配电线路上安装防雷设施可以有效降低感应雷过电压对线路的影响,常规的防雷设施安装未考虑线路所处地形问题,导致技术经济性较差,存在一定的盲目性。在ATPDraw中建立感应雷过电压计算模型,仿真分析线路装设不同防雷设施以及装设密度不同时线路感应雷耐雷水平。根据广西地形地貌特点、配电网线路杆塔间距、导线类型以及地区雷区等级,将配电线路防雷等级分为A、B、C、D、E五级,对应设计不同的防雷方案。最后通过两条10kV配电网线路防雷改造前后雷电参数对比,验证了所提出的差异化防雷方案可以有效地提高线路耐雷水平,降低感应雷对线路的影响,提高供电可靠性,降低运行成本,同时相关研究结论可以指导生产实践,减少一线工人检修压力。

Distribution lines are susceptible to induced lightning overvoltage and lightning accidents,the installation of lightning protection facilities on the distribution line can effectively reduce the impact of induced lightning overvoltage on the line,the conventional lightning protection facilities are installed without taking into account the topography of the line is located in the problem,resulting in poor technical economy,there is a certain degree of blindness.This paper establishes an induced lightning overvoltage calculation model in ATPDraw,simulates and analyses the level of induced lightning resistance of the line when the line is equipped with different lightning protection facilities as well as different densities of installation.According to the topographic and geomorphological characteristics of Guangxi,distribution network line tower spacing,conductor type and regional minefield level,the distribution line lightning protection level is divided into A,B,C,D,E five levels,corresponding to the design of different lightning protection scheme.Finally,through the comparison of lightning parameters before and after the lightning protection transformation of two 10kV distribution network lines,it is verified that the differentiated lightning protection scheme proposed in this paper can effectively improve the level of lightning resistance of the line and reduce the impact of induced lightning on the line,improve power supply reliability and reduce operating costs,while the relevant research conclusions can guide production practice and reduce the pressure on first-line workers to overhaul.