多层土壤结构下垂直接地装置在输电杆塔接地中的应用方法  

Application Method of Vertical Grounding Device in Grounding of Transmission Tower Under Multilayer Soil Structure

作　　者：朱子茵 杨鑫[1] 焦艺哲 谢炀 乐骁文 刘宇彬 ZHU Ziyin;YANG Xin;JIAO Yizhe;XIE Yang;LE Xiaowen;LIU Yubin(School of Electrical Engineering,Changsha University of Science and Technology,Changsha 410114,China;Hunan Economic Research Electric Power Design Co.,Ltd.,Changsha 410014,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114 [2]湖南经研电力设计有限公司,长沙410114

出　　处：《电瓷避雷器》2024年第6期111-120,共10页Insulators and Surge Arresters

摘　　要：针对山岩等高土壤电阻率地区输电线路杆塔接地施工不便、降阻技术经济效益差的问题,本研究提出一种含垂直接地装置的立体式输电杆塔接地方法。该方法利用现阶段大力推广的输电杆塔基础机械化施工技术,在杆塔基础施工的同时在接地射线的固定点位植入一定长度的接地锚栓,构成垂直接地装置,起到降阻增效的作用。文中首先给出含垂直接地装置的立体式输电杆塔接地装置的模型,并研究了考虑火花放电效应时输电杆塔接地装置冲击接地电阻数值计算方法。然后分析了土壤水平分层结构对该立体式输电杆塔接地装置冲击降阻效果的影响。最后在给出土壤水平分层反演原理和方法的基础上,通过单位长度利用率的提出以及降阻效率分析,得到了多层土壤结构下垂直接地装置最优长度的确定方法,并给出了计算实例。本研究为垂直接地装置在立体式输电杆塔接地系统中的应用提供了方法指导,为杆塔接地装置的设计提供了新思路。Aiming at the problems of inconvenient construction of transmission line tower grounding and poor economic benefits of resistance reduction technology in high soil resistivity areas such as mountain rock,the author proposes a three-dimensional transmission tower grounding method with vertical grounding device.The method utilizes the mechanized construction technology of transmission tower foundation which is vigorously promoted at the present stage to implant a grounding anchor bolt of a certain length at the fixed point of the grounding ray while the tower foundation is constructed to form a vertical grounding device,which plays the role of reducing resistance and increasing efficiency.In this paper,the model of three-dimensional transmission tower grounding device with vertical grounding device is given,and the numerical calculation method of impulse grounding resistance of transmission tower grounding device considering spark discharge effect is studied.Then,the influence of soil horizontal stratification structure on the impact resistance reduction effect of the three-dimensional transmission tower grounding device is analyzed.Finally,on the basis of the principle and method of soil horizontal stratification inversion,the method of determining the optimal length of vertical grounding device under multi-layer soil structure is obtained by proposing the utilization rate of unit length and analyzing the drag reduction efficiency,and a calculation example is given.The research provides a method guidance for the application of vertical grounding device in three-dimensional transmission tower grounding system,and offers new idea for the design of tower grounding device.

关 键 词：土壤水平分层 高土壤电阻率 垂直接地装置 冲击接地电阻 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM75