有限元分析法在变电站接地电阻短距测量方法中的应用

运用有限元计算软件ANSYS对变电站接地电阻的短距测量方法进行了研究。借助于ANSYS中的电流场分析模块,对引入电流极前后接地网的地表电位分布进行了计算分析,并根据补偿法原理计算得出电压极的测量位置。依据该计算分析结果,对接地网的接地电阻进行了实际测量。实验结果与计算结果吻合良好,验证了有限元分析在接地电阻短距测量法中应用的有效性。在此基础上,再次利用ANSYS对分层土壤的情况进行了研究分析,体现了有限元分析方法的灵活性与实用性。

Application of Finite Element Method to the Grounding Resistance Measurement with Short Leads

FEM (Finite Element Method)is applied to the study of the method to the measurement of grounding resistance with short leads. ANSYS,the general FEM software,is used. The earth-surface potential distributions with/without the current electrode are calculated with steady electric field analysis module of ANSYS. According to the compensation theory,the position of test potential electrode to measure the grounding resistance is chosen. Based the analysis result,the grounding resistance of a real grounding grid is tested. The test result is very close to the calculated result,which shows the validity of application of FEM to the grounding resistance measurement. In addition,the situation of grounding grid buried in multi-layer soil is studied,which shows the flexibility and practicability of the FEM.