NDLI: A double logarithmic approximation of Carson's ground-return impedance

Content Provider	IEEE Xplore Digital Library
Author	Noda, T.
Copyright Year	1986
Abstract	This paper proposes a simple closed-form formula of the ground-return impedance of horizontal parallel wires above a lossy ground plane. It is derived by a double logarithmic approximation of the integral term with a semi-infinite interval in Carson's ground-return impedance formula. The proposed double logarithmic approximation gives better accuracy compared to a similar approximation proposed by Pizarro and Eriksson, and this is achieved by an advanced optimization technique used for determining the coefficients in the double logarithmic approximation and also by incorporating an additional variable which minimizes errors. In this paper, it is shown, using practical examples, that the derived formula gives more accurate results compared with other existing approximate formulas. It is also shown that a graphical interpretation of the double logarithmic approximation is to replace a homogeneous lossy ground with a pair of perfectly conducting return planes located at different complex depths.
Sponsorship	IEEE Power Engineering Society
Starting Page	472
Ending Page	479
Page Count	8
File Size	376992
File Format	PDF
ISSN	08858977
Volume Number	21
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Conductors Wires Power transmission lines Electromagnetic analysis Transient analysis Electromagnetic propagation Propagation losses Circuits Power distribution lines surges Approximation methods electromagnetic transient analysis ground-wave propagation impedance lossy circuits power distribution lines power transmission lines skin effect
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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