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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.8 P.1191-1198

http://doi.org/10.1631/jzus.A0820598


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


Author(s):  B. HEMMATIAN, B. VAHIDI, S. H. HOSSEINIAN

Affiliation(s):  Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran

Corresponding email(s):   vahidi@aut.ac.ir

Key Words:  Underground cables, Earth return path impedance, Earth stratification, Finite element method (FEM)


B. HEMMATIAN, B. VAHIDI, S. H. HOSSEINIAN. Earth return path impedances of underground cable for three-layer earth[J]. Journal of Zhejiang University Science A, 2009, 10(8): 1191-1198.

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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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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