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大型铜包钢接地网的数值计算方法的研究

DOI: 10.16188/j.isa.1003-8337.2015.01.019, PP. 93-98

Keywords: 铜包钢导体,贝塞尔函数展开式,等效电阻率,等效磁导率,CDEGS

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Abstract:

采用铜包钢接地网能够有效降低工程造价,并能够有效降阻,为解决大型接地网中使用铜包钢导体而无法利用常用软件CDEGS对铜包钢导体建模的问题,需对铜包钢接地网的数值计算方法进行研究。本文根据铜包钢导体的自阻抗模型,将铜包钢等效为同尺寸的导体。利用贝塞尔函数展开式求解不同频率下的不同半径、不同镀铜层厚度的铜包钢导体的等效电阻率与等效磁导率,据此建立铜包钢导体的等效自阻抗模型。根据接地网数值计算方法,可利用铜包钢导体的等效电阻率和等效磁导率对铜包钢接地网予以数值计算。利用CDEGS建立铜包钢接地网模型,并与MATLAB编程进行对比,验证了铜包钢接地网的数值计算方法的正确性。

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