中文摘要：

针对任意布置电压和电流测量极情况下反演土壤模型的计算方法,以及变电站进行后期扩建时测量土壤参数时应选择的测试极与接地网最小距离的问题,基于水平多层土壤中的格林函数和不等间距接地网计算模型,建立了任意布置接地极和考虑接地网影响情况下土壤水平分层模型参数的反演计算方法。在验证该计算方法的同时,说明了等距四极法、直线四极法、任意四极法的有效性。以一个简单的接地网为例,对比了考虑接地网与否情况下反演土壤模型和计算接地电阻的差异,说明了接地网的影响范围。结果表明,在满足测试标准要求的前提下测试极连线与接地网边缘的平行间距至少为0.618倍接地网对角线长度。

英文摘要：

In accordance with the arbitrarily disposed grounding electrodes,taking the effect of grounding grid into account,we put forward a new method to inverse the parameters of horizontally stratified soil model on the basis of the Green function of horizontal multiple-layer soil and the calculation model of grounding grid with unequal spacing.The proposed method can be used in later expansion of station to select measurement electrode and the minimum distance of grounding grid in soil parameter measurement.In the validation of the method,the effectiveness of the equal-spacing four-electrode method,straight four-electrode method,and arbitrary four-electrode method is evaluated.By taking a simple grounding grid as example,the inversed soil model and grounding resistivity are compared for the cases with and without consideration of grounding grid.The effective range of the grounding grid is defined.It is required that,on the premise of measurement standard,the space between the connection line of measurement electrodes and the grounding gird edge is not less than 0.618 times that of the diagonal the grounding gird.