铜包钢绞线在工程接地中的应用探讨

为有效的解决铜包钢绞线在实际工程接地中的应用问题，建立实心圆柱及空心圆柱导体的并联模型并推导其阻抗表达式，有针对性地研究计算铜包钢导体在工频下的自阻抗参数，并得到其等效电阻率及磁导率。通过热稳定校验得到不同材料作为接地导体的最小截面积，并选取合适的导体尺寸，利用国际通用软件CDEGS进行大型地网的接地计算。通过对计算结果的分析，验证了该方法的合理性，并发现铜包钢地网的接地参数更接近铜地网的参数。对某一工程算例，计算比较了铜、铜包钢、钢三种导体接地网的接地参数，得出铜包钢作为接地网材料具有优良的接地性能、较大的经济优势等结论。

Discussion on the Application of Copper-clad Steel Wire in Grounding of Engineering

In order to solve the problem of the application of copper clad-steel wire in practical engineering, a parallel model of solid cylindrical conductor and hollow cylindrical conductor was established, and its impedance expression was proved. The minimum cross-sectional area of the ground conductor of different materials were checked with thermal stability, and the appropriate size of the conductors were selected, and the international general software CDEGS was used for grounding calculation of large grounding grid. The rationality of the method was proved with the analysis of the calculation results, and we found that the grounding parameters of copper-clad steel grounding grid was more close to the parameters of copper grounding grid. As a project example, the grounding parameters of copper grounding grid, copper-clad steel grounding grid, and steel grounding grid were calculated and compared, and these conclusions could be found, that copper-clad steel had excellent grounding performance and great economic advantages as grounding material.