本文介绍了一种计算变电站接地网阻抗的简单而准确的算法。此算法基于数字瞬时法以及电流镜像的理论化处理。公式和变电所的地网设计相关,诸如:地网的深度、地网形状、网眼格量、栅条直径等。文章中比较了六种不同算法及公式以研究其准确度。文章得出结论用此算法得到的结果和用复杂计算得到的结果相互吻合。 This article presents a simple and accurate algorithm for calculating the impedance of a substation’s grounding grid. This algorithm is based on the digital transient method and the theoretical processing of the current mirror. The formula is related to the design of the substation’s ground network, such as the depth of the earth network, the shape of the earth network, the amount of mesh grid, the diameter of the grid, and the like. The article compares six different algorithms and formulas to study their accuracy. The article concludes that the results obtained by this algorithm are consistent with the results obtained by complex calculations.