摘要
对于分层土壤中任意块状基础穿入多层土壤的接地模型,提出了分层土壤任意块状基础的接地计算方法,避免以往简化模型本身存在的缺陷。针对该问题考虑水平分层土壤结构和块状基础穿入多层土壤的情况,依据矩量法对静电场积分方程进行离散,以接地体段的线电流密度和不同介质间分界面上的面电荷密度为未知量,列写并解线性方程组,基于C++编程进行数值求解。通过典型特高压杆塔基础算例的接地电阻计算,说明了该方法的有效性和正确性。还分析了典型特高压杆塔基础接地电阻与水平双层土壤模型参数的关系,说明典型上层土壤厚度逐渐增大影响特高压杆塔基础接地电阻主要决定因素,同时说明当上层土壤厚度较浅时,降低下层土壤电阻率对减小杆塔基础接地电阻效果明显,准确估计下层土壤电阻率对接地计算有重要影响。
Considering the grounding model of a embedded arbitrary massive texture foundation in the layered-soil,the grounding computation with massive texture foundation in layered-soil is presented in this paper,which avoids drawbacks of traditional simplified models. The horizontal layered soil and the multiple layered-soils embedded by arbitrary massive texture foundation are both considered. According to moment method（ MOM）,electrostatic field integral equations are discretized. The current density for rods segment and surface charge density for boundary surface between varies medium are set as the variables,and the linear equations are listed and solved based on C ＋ ＋. The grounding resistance is calculated for typical ultra high voltage（ UHV） tower foundation,which proves the correctness and validity for the algorithm. The relationship between the grounding resistances of the UHV tower foundation and the model parameters of two-layer soil has been discussed. The increasing thickness of upper layer is the decisive factor for the grounding resistance. When the top soil thickness is small,the decrease of the lower layer resistivity has eminent impacts on the decrease of the tower foundation grounding resistance. Also the accuracy in evaluating the lower layer resistivity is important for the grounding calculation.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第7期145-151,共7页
Transactions of China Electrotechnical Society
基金
国家电网公司项目(特高压接地技术试验研究)资助
关键词
分层土壤任意块状基础
接地电阻
特高压杆塔基础
矩量法
Layered-soils with massive texture foundation
grounding resistance
ultra high voltage tower foundation
method of moments
