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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1786

Title: Attenuation and EMI frequency spectrum for distribution lines
Authors: Al-Bahrani, A.H.
Malik, N.H.
Keywords: Corona and gap discharges
Electromagnetic interference
EMI
Issue Date: 1990
Publisher: King Saud University
Citation: Journal of King Saud University, Engineering Sciences: 2 (2); 229-243
Abstract: Corona and gap discharges occur at discrete points on distribution lines. Such discharges may produce electromagnetic interference (EM!) to the communication and control systems operating near such lines. Due to the discrete nature of distribution lines EM! sources, the total EM! produced by them is strongly influenced by the attenuation characteristics of the line. This paper discusses the factors which can influence the attenuation characteristics of distribution lines. Attenuation values are calculated for a typical three phase distribution line for different values of frequency, earth resistivity, conductor size, inter-conductor spacing, height and ground wire arrangement. The resulting values are presented in the form of empirical equations. Using such attenuation values, the relationship between the injected and measured noise is discussed for isolated as well as uniformly distributed noise sources. It is shown that unlike transmission lines, the distribution lines EM! may exhibit a variety of EM! frequency spectra depending upon the lines and soil parameters, type of noise source, as well as location of measurement point with respect to the noise source.
URI: http://hdl.handle.net/123456789/1786
Appears in Collections:Journal of the King Saud University - Engineering Sciences

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