一种计算变电站接地网电阻的简化方法

提出了一种简单而精确的接地电阻的计算方法。这种方法是以数值分析和镜像法的理论为基础。利用导体的电阻与其电容的对偶性,通过计算导体间的电容来得到接地网的接地电阻,该方法中的计算参数与变电站接地网的设计有关,如接地网埋设深度,接地网规模,网格数量,接地体直径等。为了检验该方法,将通过该方法所得的结果与文献中的六种不同的公式和方法所得的结果进行了比较。发现由该公式的计算得到的结果与通过计算机得到的结果最接近,从而证明该方法的可靠性。

A Simplified Method for Calculating the Substation Grounding Grid Resistance

A simple and accurate method for calculating the grounding grid resistance is proposed. This method is based on theory of the numerical analysis method and image method.Using the duality between conductor resistance and its capacitance,the grounding resistance of grounding grid is obtained by calculating the capacitance between the conductors.The formula is dependent on the substation grounding grid design,such as grid depth,grid size,number of meshes,grid-conductor diameter, etc..In order to verify this method,the comparison of the proposed formula with respect to six different formulas and methods in the literature and the computerized method is performed.An excellent agreement has been found between the results of this formula and the results of a sophisticated computerized method,thus the reliability of the method has been proved.