结合矩量法和边界元法的综合接地算法研究

为解决复杂土壤条件下接地系统参数计算问题,结合矩量法和边界元法,提出了一种可计算土壤中含有不同电阻率媒质模型的新型接地数值算法。该算法在分层土壤模型计算方法基础上,将土壤中不同电阻率媒质表面进行块状剖分,通过计算每块边界单元的电荷量分析其对地下电场以及接地系统泄漏电流分步的影响。该方法弥补了目前接地计算方法只能处理分层土壤模型的缺点,可对既分层又分块的土壤模型进行计算。同时通过两个接地极模型的计算,证明了该方法的可行,并通过其计算结果与经典文献中计算结果以及实测结果的比较说明该方法的正确性。

Numerical Analysis Method Combining Method of Moments and Boundary Element Method on Grounding Calculation

We put forward a new numerical method which can analyze soil model with finite volumes of different resistivity.The method couples method of moments(MoM) to the boundary element method(BEM),which can study the parameters of grounding system in a complicated soil model.On the basis of the layered soil model,by dividing the surface of finite volume of different resistivity in the soil into several boundary elements,the surface charge of each element can be calculated,therefore the influence of these elements on the distribution of underground electric field and the leakage current from the grounding conductors can be determined.This method can analyze not only the layered soil model but also a layered soil model in the existence of several finite volumes of different resistivity.By applying the method to two grounding systems,calculation results are achieved to prove the feasibility of this method.By comparing the calculation results given by the method to the results given by several reference papers,the correctness of the method can also be proved.