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作 者:张子建[1] 孟庆大[2] 戴雪光[1] 张先知 刘伟楠 ZHANG Zijian;MENG Qingda;DAI Xueguang;ZHANG Xianzhi;LIU Weinan(State Grid Beijing Electric Power Company, Beijing 100031, China;State Grid Corporation of China, Beijing 100031, China;State Grid Ganzi Power Supply Company, Ganzi 626000, China;State Grid Corporation of China, Beiging 100031, China)
机构地区:[1]国网北京市电力公司,北京100031 [2]国家电网公司,北京100031 [3]国网四川省电力公司甘孜供电公司,四川甘孜626000
出 处:《电瓷避雷器》2018年第3期91-95,共5页Insulators and Surge Arresters
摘 要:配电线路由于线路布置区域复杂、高度较低等因素,树木对其防雷性能会产生一定影响。本文利用改进电气几何模型分析并行树木对配电线路的屏蔽效应,通过EMTP软件建立树木与线路耦合模型,计算雷击树木时线路感应过电压,分析树木高度、树木与线路水平间距对线路防雷的影响。分析结果表明:树木对线路的屏蔽作用随着树木和线路水平间距的增大而降低;树木高度越高,对线路的屏蔽效应越明显。雷击树木时线路感应过电压随着树木高度的增加而降低,但降低趋势趋缓。过电压随着树木与线路水平间距的增大而减小,且水平距离越远,降低幅度越大。雷击树木时对线路跳闸危害相对较小,但进行线路敷设与绿化设计时仍需合理考虑二者间距。Due to the complexity of the line layout and the lower height of the distribution lines, the trees will have a certain impact on their lightning protection performance. An improved electro geometric model (EGM) is applied to analyze shielding effect of trees, the tree and line coupling model is estab- lished by EMTP software, to calculate induced overvoltage on the distribution line. Effects of height of the tree and distance of the tree from the distribution line on induced overvohage were discussed. The results show that, the shielding effect of trees on the line decreases with the increase of distance between trees and lines. The higher the height of trees is, the more obvious the shielding effect is. The induced overvoh- age caused by lightning strikes trees decreases with the increase of tree height, but the trend decreases. The overvoltage decreases with the increase of the distance between the tree and the line, and the farther the distance is, the greater the reduction is. When lightning strikes trees, the damage to the line tripping is relatively small, but the distance between the two should be considered reasonably when laying the line and greening design.
分 类 号:TM863[电气工程—高电压与绝缘技术]
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