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  • 标题:A point source in the presence of spherical material inhomogenity: Analysis of two approximate closed form solutions for electrical scalar potential
  • 本地全文:下载
  • 作者:Rančić Predrag D. ; Stojanović Miodrag S. ; Rančić Milica P.
  • 期刊名称:Facta universitatis - series: Electronics and Energetics
  • 印刷版ISSN:0353-3670
  • 电子版ISSN:2217-5997
  • 出版年度:2009
  • 卷号:22
  • 期号:3
  • 页码:265-284
  • DOI:10.2298/FUEE0903265R
  • 出版社:University of Niš
  • 摘要:

    A brief review of derivation of two groups of approximate closed form expressions for the electrical scalar potential (ESP) Green functions that originates from the current of the point ground electrode (PGE) in the presence of a spherical ground inhomogenity, are presented in this paper. The PGE is fed by a very low frequency periodic current through a thin isolated conductor. One of approximate solutions is proposed in this paper. Known exact solutions that have parts in a form of infinite series sums are also given in this paper. Here, the exact solution is solely reorganized in order to facilitate comparison to the closed form solutions, and to estimate the error introduced by the approximate solutions. Finally, error estimation is performed comparing the results for the electrical scalar potential obtained applying the approximate expressions and accurate calculations. This is illustrated by numerous numerical experiments. .

  • 关键词:electrical scalar potential; green's function; point ground electrode; spherical inhomogenity
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