Earth return path impedances of underground cable for three-layer earth  

作　　者：B.HEMMATIAN B.VAHIDI S.H.HOSSEINIAN 

机构地区：[1]Department of Electrical Engineering,Amirkabir University of Technology

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2009年第8期1191-1198,共8页浙江大学学报（英文版）A辑（应用物理与工程）

摘　　要：One of the factors that affect the parameters of an underground cable is earth return path impedance.Pollaczek developed a formula for the case of one-layer(homogenous) earth.But in practice the earth is composed of several layers.In this study we develop a new formula for earth return path impedance in the case of a three-layer earth.To check the accuracy of the obtained results,a comparison has been made with the finite element method(FEM).A comparison between the results of the Pollaczek formula and results of the obtained formula for a three-layer earth has been made,showing that the use of the Pollaczek formula instead of the actual formula can cause serious errors.One of the factors that affect the parameters of an underground cable is earth return path impedance. Pollaczek developed a formula for the case of one-layer （homogenous） earth. But in practice the earth is composed of several layers. In this study we develop a new formula for earth return path impedance in the case of a three-layer earth. To check the accuracy of the obtained results, a comparison has been made with the finite element method （FEM）. A comparison between the results of the Pollaczek formula and results of the obtained formula for a three-layer earth has been made, showing that the use of the Pollaczek formula instead of the actual formula can cause serious errors.

关 键 词：Underground cables Earth return path impedance Earth stratification Finite element method （FEM） 

分 类 号：TN913.321[电子电信—通信与信息系统]