饱和水土壤电阻率温度特性及对直流接地极温升的影响  

Temperature Characteristics of Water-saturated Soil Resistivity and its Influence on DC Grounding Electrode Temperature Rise

作　　者：景茂恒 卢文浩 彭翔 赵航航 韦晓星 陈小月 鲁海亮[3] JING Maoheng;LU Wenhao;PENG Xiang;ZHAO Hanghang;WEI Xiaoxing;CHEN Xiaoyue;LU hailiang(Maintenance&Test Center of EHV Power Transmission Company of China Southern Power Grid,Guangzhou 510663,China;Guangzhou Bureau of EHV Power Transmission Company of China Southern Power Grid,Guangzhou 510663,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]南方电网超高压输电公司检修试验中心,广东广州510663 [2]南方电网超高压输电公司广州局,广东广州510663 [3]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《智慧电力》2022年第12期19-25,33,共8页Smart Power

基　　金：国家自然科学基金资助项目(51907145)。

摘　　要：针对土壤含水量较高的区域直流接地极温升特性不明的问题,对不同类型的土壤进行了水饱和温升电阻率测量。并在此基础上建立了饱和水土壤接地极的电热耦合有限元模型。通过算例与未考虑含水饱和土壤电阻率温升效应的仿真结果进行对比,发现其温升结果明显偏低,随着电流注入时间的增加,电极温升曲线的饱和度变得更加明显。最后进行了饱和水土壤垂直电极的温升试验,验证了耦合模型的可靠性。实验和仿真结果表明,考虑饱和水土壤温度特性可使计算误差降低31.84%。因此,结合饱和水土壤电阻率温度特性对接地极进行温升计算,能更大程度的保证计算的准确性。Aiming at the problem that the temperature rise characteristics of DC grounding electrodes in areas with high soil water content are unknown,this paper measures the water saturation temperature rise resistivity of different types of soils.On this basis,an electro-thermal coupled finite element model of the grounding electrode in water-saturated soil is established.A numerical example is used to compare the simulation results without considering the temperature rise effect of water-saturated soil resistivity,it is found that the temperature rise result is obviously low.With the increase of current injection time,the saturation of the electrode temperature rise curve becomes more obvious.Finally,the temperature rise test of the vertical electrode in the water-saturated soil is carried out to verify the reliability of the coupled model.The experiment and simulation results show that the calculation error can be reduced by31.84%by considering the soil temperature characteristics of the saturated water.Therefore,calculating the temperature rise of the grounding electrode in combination with the temperature characteristics of the soil resistivity of the saturated water can ensure the accuracy of the calculation to a greater extent.

关 键 词：高压直流接地极 饱和水土壤 电阻率 有限元法 电热耦合模型 

分 类 号：TM721.1[电气工程—电力系统及自动化]