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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (8): 1191-1198    DOI: 10.1631/jzus.A0820598
Electrical & Electronic Engineering     
Earth return path impedances of underground cable for three-layer earth
B. HEMMATIAN, B. VAHIDI, S. H. HOSSEINIAN
Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
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Abstract  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.

Key words： Underground cables      Earth return path impedance      Earth stratification      Finite element method (FEM)     
Received: 12 August 2008     
CLC:  TM75  
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B. HEMMATIAN, B. VAHIDI, S. H. HOSSEINIAN. Earth return path impedances of underground cable for three-layer earth. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(8): 1191-1198.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0820598     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I8/1191

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