三维交错结构短导体在输电杆塔接地装置中的应用方法  

Application of three‑dimensional interleaved short conductors in transmission tower grounding device

作　　者：杨泰 杨鑫[1] 刘宇彬 朱子茵 谢炀 周秀 YANG Tai;YANG Xin;LIU Yubin;ZHU Ziyin;XIE Yang;ZHOU Xiu(School of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha 410114,China;Hunan Economic Research Electric Power Design Co.,Ltd.,Changsha 410014,China;Electric Power Research Institute,State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750001,China)

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410114 [2]湖南经研电力设计有限公司,湖南长沙410014 [3]国网宁夏电力有限公司电力科学研究院,宁夏银川750001

出　　处：《电力科学与技术学报》2023年第6期259-266,共8页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金面上项目(52177015)。

摘　　要：降低杆塔的冲击接地电阻是提高输电线路反击耐雷水平的有效措施,而目前的各种降阻方法普遍存在技术经济性及施工难度难以兼顾的问题。在接地体上添加短导体,兼具降阻和施工简便的优势。为此,研究利用三维交错结构短导体降低杆塔冲击接地电阻的方法,并给出短导体的参数优化方法。首先,考虑土壤非线性电离影响在内,采用CDEGS软件对添加短导体接地装置时的冲击接地电阻进行计算,计算结果表明三维交错结构短导体具有更好的降阻效果;然后,以单位长度降阻率和最小冲击接地电阻为指标,对三维交错结构短导体的长度和间隔进行参数优化;最后,以1000Ω⋅m土壤电阻率为例,求得短导体的最优长度和最优间隔分别为1.1、2.8 m,添加三维交错结构短导体的接地装置可降低16.52%的冲击接地电阻。研究结果可为输电杆塔接地装置的设计提供方法指导。Reducing the impulse grounding resistance of transmission towers is an effective measure to improve the lightning surge withstand capability of transmission lines.However,current methods for reducing resistance generally face challenges in balancing technical and economic feasibility,as well as construction difficulty.Adding short conductors to the grounding device combines the advantages of resistance reduction and simplified construction.This paper explores the use of three‑dimensional interleaved short conductors to reduce the impulse grounding resistance of transmission towers,and provides the parameter optimization approach for short conductors.Firstly,considering the influence of nonlinear ionization in the soil,the impulse grounding resistance of grounding device with short conductors is calculated by the CDEGS software.Results indicate that the short conductors with three‑dimensional interleaved structure exhibit superior resistance reduction effects.Subsequently,taking the resistance reduction rate per unit length and minimum impulse grounding resistance as indicators,the length and spacing arrangements of three‑dimensional interleaved short conductors are optimized.Finally,taking a soil resistivity of 1000Ω•m as an example,the optimal length and spacing of the short conductors are determined to be 1.1 m and 2.8 m,respectively.The addition of the three-dimensional interleaved structure short conductors to the grounding device can reduce the impulse grounding resistance by 16.52%.This paper provides a method guidance for the design of transmission tower grounding device.

关 键 词：三维交错结构短导体 接地优化设计 杆塔接地装置 降阻 CDEGS软件 

分 类 号：TM862[电气工程—高电压与绝缘技术]