W. Xiong

Safe Engineering Services & technologies ltd., Quebec City, Quebec, Canada

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Publications (4)5.22 Total impact

  • F.P. Dawalibi · Wei Xiong · Jinxi Ma
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    ABSTRACT: When lightning strikes an electric substation, large currents generated by the stroke flow in the above ground structures and grounding system and dissipate in the soil. The electromagnetic fields generated by such high currents may cause damage to equipment and may be dangerous to personnel working nearby. In this paper, the frequency and time domain performance of a substation subjected to a lightning strike is described and discussed. The computed scalar potentials, electric fields, and magnetic fields are presented graphically as a function of spatial coordinates. As a function of time and as a function of both. Two cases are considered. The first case examines the substation grounding system only, while the second case includes an above-ground structure as well. It is believed that the results of the second case have not been published before. A double exponential lightning surge current is injected at one corner of the substation. The response of the grounding system to the frequency domain electromagnetic spectrum of this signal is computed by a frequency domain electromagnetic field analysis software package. The temporal and spatial distributions of the electromagnetic fields inside and near the substation are obtained by an inverse Fourier transformation of all these responses. The presence of a soil with an arbitrary resistivity and permittivity is accurately taken into account. The analysis sheds some new light on the understanding of the effects which take place at the higher frequencies
    No preview · Article · Jun 1995 · IEEE Transactions on Industry Applications
  • W. Xiong · F.P. Dawalibi
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    ABSTRACT: The frequency and time domain performance of a typical substation grounding system subjected to a lightning strike is described and discussed. The computed scalar potentials, electric fields and magnetic fields are presented graphically as a function of spatial coordinate, as a function of time and as a function of both. First, a double exponential lightning surge current is injected into the center of a square ground grid. This same surge current is then injected at one corner of the grid. The response of the grounding system to the frequency domain electromagnetic spectrum of this signal is computed by a frequency domain electromagnetic field analysis software package. Once all the frequency responses have been computed, the temporal and spatial distributions of the electromagnetic fields inside and near the substation are obtained by an inverse Fourier transformation of all these responses. The results are compared with some well known low frequency results and to published work in this area. These results indicate that the performance of the grounding system is significantly dependent on frequency and on the point of impact of the lightning strike
    No preview · Article · Aug 1994 · IEEE Transactions on Power Delivery
  • F.P. Dawalibi · W. Xiong
    [Show abstract] [Hide abstract]
    ABSTRACT: When lightning strikes an electric substation, large currents generated by the stroke flow in the aboveground structures and grounding system and dissipate in the soil. The electromagnetic fields generated by such high currents may cause damage to equipment and may be dangerous to personnel working nearby. In this paper, the frequency and time domain performance of a substation subjected to a lightning strike is described and discussed. The computed scalar potentials, electric fields and magnetic fields are presented graphically as a function of spatial coordinates, as a function of time and as a function of both. Two cases are considered. The first case examines the substation grounding system only, while the second case includes an aboveground structure as well. It is believed that the results of the second case have not been published before. A double exponential lightning surge current is injected at one corner of the substation. The response of the grounding system to the frequency domain electromagnetic spectrum of this signal is computed by a frequency domain electromagnetic field analysis software package. The temporal and spatial distributions of the electromagnetic fields inside and near the substation are obtained by an inverse Fourier transformation of all these responses. The presence of a soil with an arbitrary resistivity and permittivity is accurately taken account. Analysis sheds some new light on understanding of the effects which take place at the higher frequencies
    No preview · Conference Paper · Jun 1994
  • F.P. Dawalibi · W. Xiong · J. Ma
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    ABSTRACT: ANSI/IEEE Standard 80 is widely used to determine electrical currents flowing through the human body as the result of touch and step voltages near transmission and distribution facilities. This paper shows, however, that significant inaccuracies can occur when the ANSI/IEEE Standard 80 proposed method to calculate foot resistances is applied in substations covered by a thin layer of crushed rock or similar covering layers. In particular, it is shown that the errors obtained by using the infinite series expression of the foot resistance are consistently larger than those produced by the simplified expression for clean and contaminated surface layers. This paper also compares its results with those proposed recently in the literature. It is shown that these recent proposed equations may be subject to major errors under certain conditions. Equivalent Thevenin foot resistances are plotted for various scenarios of clean and contaminated surface covering layers.
    No preview · Article · Feb 1993 · IEEE Transactions on Power Delivery

Publication Stats

85 Citations
5.22 Total Impact Points

Institutions

  • 1994
    • Safe Engineering Services & technologies ltd.
      Quebec City, Quebec, Canada