土壤模型复杂化对输电线路杆塔接地及耐雷性能的影响  

Influence on Power Tower Grounding and Lightning Performance of Power Transmission Line for the Complexity Soil Model

作　　者：唐波[1] 朱建雄[1] 黄颖[1] 瞿子航 葛光祖[1] 

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《太原理工大学学报》2015年第1期94-99,共6页Journal of Taiyuan University of Technology

基　　金：三门峡供电公司资助项目:三门峡周边小区110kV杆塔接地电阻特性分析及降阻措施研究(SDHZ2012087)

摘　　要：传统输电线路杆塔接地工程设计均基于无限大均匀土壤电性模型,该土壤电性模型与实际土壤不符,可能造成接地设计的不准确。基于拉普拉斯方程,推导了水平双层和垂直双层土壤电性模型下的杆塔接地装置的电位函数表达式,从而提出了相应条件下接地电阻的计算方法。以三门峡地区110kV中横线典型铁塔接地为例,分别采用规程法和分层土壤精确计算法,对无限大均匀土壤、水平双层和垂直双层等土壤电性模型下的典型线路杆塔反击跳闸率进行了计算。结果表明,若以无限大均匀土壤设计接地装置,其反击跳闸率较土壤二分层情况低。In the traditional design of tower ground engineering of power transmission line, the soil is simulated as infinite uniform electric soil model, which is different from the actual soil. Therefore, there would be errors for ground design. Based on Laplace Equation, the potential function of tower grounding device under the horizontal and vertical two-layer soil model is deduced. As a result, the corresponding method for grounding resistance calculation is acquired. With the typical ground device of 110 kV Zhongheng power line as an example,the rules method and the accurate calculation method for layer soil model are adopted, and then the counterattack trip rates of the typical line are calculated with several of electrical models：the infinite uniform soil, the horizontal and vertical two-layer electric soil. The results show that with an infinite uniform soil for design of grounding device, counterattack trip rate is lower than those two-layer soil model.

关 键 词：输电线路 杆塔接地装置 接地电阻 土壤电性模型 反击跳闸率 

分 类 号：TM723[电气工程—电力系统及自动化]