直流接地极土壤电阻率建模方法研究

Research on Soil Resistivity Modeling Method of DC Grounding Electrode

摘要: 直流接地极是直流输电工程的重要组成部分，其周围土壤电阻率的分布情况，直接影响到接地极的参数设计以及运行维护。为保证接地极的正常工作，避免对接地极附近人身安全及设备性能造成影响，有必要对接地极周边的土壤电阻率进行测试及建模。本文利用四极法和大地电磁法对接地极周边的土壤电阻率进行测试，将这两种测试方法得到的结果进行对比，综合分析了这两种方法在土壤电阻率测试方面各自的优缺点，并通过本团队自主研发的反演软件对土壤电阻率进行建模，最后根据该土壤模型计算得到的接地电阻值与参考值吻合度较高，验证了本文提出方法的可靠性和准确性。

Abstract: The DC ground electrode is an important part of the DC transmission project. The distribution of the soil resistivity around it directly affects the parameter design and operation and maintenance of the ground electrode. In order to ensure the normal operation of the ground electrode and avoid af-fecting the personal safety and equipment performance near the ground electrode, it is necessary to test and model the soil resistivity around the ground electrode. In this paper, the four-pole method and the magnetotelluric method are used to test the soil resistivity around the ground electrode. The results obtained by these two test methods are compared, and the respective advantages and disadvantages of these two methods in soil resistivity testing are comprehensively analyzed. The soil resistivity is modeled by the inversion software independently developed by our team. Finally, the grounding resistance value calculated according to the soil model is in good agreement with the reference value, which verifies the reliability and accuracy of the method.