盐分对冻土土壤电阻率的影响

Effect of Salinity on the Resistivity of Frozen Soil

接地系统是电力系统正常运行的保证,也是保证人身与设备安全的关键所在。季节性冻土区域由于冻结作用的影响,冻土的土壤电阻率明显升高,严重影响了系统的接地性能。根据蒙东地区的冬季环境温度与土壤结构调研结果,构建了相应的土壤导电模型,搭建了土壤电阻率测量试验平台,采用四电极法对各处理的电阻率进行测定。设计不同盐分类型、不同盐分浓度的土壤样本在-20℃恒温密闭环境内的冻土试验,分析了冻土盐分和温度对土壤电阻率的影响。试验结果可为冻土区域接地系统设计提供参考。

The grounding system is the guarantee for the normal operation of the power system and the key to ensuring the safety of people and equipment.Due to the effect of freezing in seasonally frozen soil regions,the soil resistivity of frozen soil increases significantly,which seriously affects the grounding performance of the system.According to the survey results of winter ambient temperature and soil structure in eastern Mongolia,a corresponding soil conductivity model was constructed,and an experimental platform for soil resistivity measurement was built.The four-electrode method was used to measure the resistivity of each treatment.A permafrost experiment was designed for soil samples with different salt types and concentrations in a constant temperature closed environment of-20℃,and the effects of permafrost salinity and temperature on soil resistivity were analyzed.The test results can provide a reference for the grounding system in the frozen soil area.