A complete procedure to determine earth fault current distribution and split factor for grounding grid design of HV substations

	A complete procedure to determine earth fault current distribution and split factor for grounding grid design of HV substations
Iranian Journal of Science and Technology Transactions of Electrical Engineering
شناسنامه علمی شماره، دوره 32، شماره 3، فروردین 2008، صفحه 205-221 اصل مقاله (362.22 K)
شناسه دیجیتال (DOI): 10.22099/ijste.2008.838
چکیده
To design a safe substation grounding grid, it is necessary to compute the split factor for earth fault current and also current distribution in other possible paths. In this paper, a novel, simple and accurate method is developed for determination of this factor. In the proposed algorithm grounding grid impedance of adjacent substations, dissimilar tower footing resistances, different parallel circuits, more than one earth wires and different spans in transmission lines can be considered. In addition, the formulation for the earth faults through line towers is presented. Finally, the results are compared with the addressed cases that are comparable and show good agreement and accuracy.
کلیدواژه‌ها
Split factor؛ earth fault current؛ touch and step voltages؛ grounding grid design؛ HV substations

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