温度对土壤电阻率影响的研究  

Study of the Temperature Impact on Soil Resistivity

作　　者：曹晓斌[1] 吴广宁[1] 付龙海[1] 李瑞芳[1] 李增[1] 

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《电工技术学报》2007年第9期1-6,共6页Transactions of China Electrotechnical Society

摘　　要：青藏铁路沿线许多供变电所的接地网建在冻土区域,研究土壤电阻率的温度特性是改善冻土区域接地系统性能的关键。本文首先利用多孔介质模型分析了土壤导电的机理,并讨论了温度对土壤电阻率的影响途径;然后通过实验研究土壤电阻率温度特性;最后,根据研究结果指出了降低冻土区域土壤电阻率的可行方法。温度对土壤电阻率的影响分为三个阶段:温度在0℃以上,土壤电阻率随着温度的下降而上升;温度从0+变化到0?的过程中,土壤电阻率发生跳变;土壤的温度在0℃以下时,土壤电阻率同样随着温度的下降而上升。　Most parts of Qinghai-Tibet railway were built on the permafrost regions. Finding out the temperature characteristic of the soil resistivity is a key way to reduce the resistance of grounding system in permafrost regions. Firstly, an analysis is given to the mechanism of soil conductivity by using porous model and a discuss is done about the impact of temperature on soil resistivity. Secondly, an experiment is done to research the influence of temperature on soil resistivity. At last, the ways are pointed out to reduce the resistivity of frozen soil. The temperature characteristic of the soil resistivity can be divided into three phases： if temperature is greater than 0℃, soil resistivity increases as the temperature decreases, when temperature changes from 0＋ to 0_, soil resistivity has a mutation, if the temperature is below 0℃, soil resistivity increase as the temperature decreases again.

关 键 词：青藏铁路 土壤电阻率 冻土 多孔介质 接地系统 

分 类 号：TM63[电气工程—电力系统及自动化]