土壤导电机理模型及其对接地系统的影响  

Soil conduction mechanism model and its influence on grounding system

作　　者：晏伟宸 YAN Weichen(Shandong University of Political Science and Law,Power Service Center,Jinan,Shandong 255014,China)

机构地区：[1]山东政法学院动力服务中心,济南255014

出　　处：《湖南城市学院学报（自然科学版）》2024年第2期48-53,共6页Journal of Hunan City University:Natural Science

基　　金：山东省教育发展研究微课题(FH012)。

摘　　要：接地系统的稳定运行事关电力系统稳定,而土壤电阻率又是接地系统最重要的参数之一。目前,土壤电阻率多采用宏观的试验方法获取,缺乏对其微观机理的研究。基于此,首先,使用多物理场软件COMSOL Multiphysics建立土壤微观导电机理模型,计算孔隙率、粒径、水汽比、孔隙水电阻率和土壤基质电阻率对土壤电阻率的影响;其次,通过与文献实测值的比较验证本文模型的准确性;再次,计算土壤含水量参数对接地特性的影响;最后,由计算结果提出降低土壤电阻率的建议措施。计算结果表明,土壤电阻率受孔隙率、土壤基质电阻率、水汽比影响较大;接地电阻随含水量的增加以负指数函数式减小。The stable operation of grounding system is related to the stability of power system,and soil resistivity is one of the most important parameters of grounding system.At present,soil resistivity is mostly obtained through macroscopic experimental methods,and there is a lack of research on its microscopic mechanism.Based on this,firstly,a soil micro-conductivity mechanism model is established by using the Multiphysics simulation software COMSOL Multiphysics to calculate the effects of porosity,particle size,water-vapor ratio,pore water resistivity and soil matrix resistivity on soil resistivity.Secondly,the accuracy of the model is verified by comparing with the measured values in the literature.Then,the influence of soil water content parameters on the grounding characteristics is calculated.Finally,the proposed measures to reduce soil resistivity are put forward based on the calculated results.The results show that the soil resistivity is greatly affected by porosity,soil matrix resistivity and water-vapor ratio,and the grounding resistance decreases in the form of negative exponential function with the increase of water content.

关 键 词：土壤电阻率 微观机理 有限元 孔隙率 土壤基质 水汽比 

分 类 号：TM86[电气工程—高电压与绝缘技术]