Evaluation of the Grounding Resistance of Conductors Buried in Steplike Terrain

Kumar, Udaya and Pal, Rupam and Paramesha, K (2015) Evaluation of the Grounding Resistance of Conductors Buried in Steplike Terrain. In: IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, 51 (6, 2). pp. 5130-5138.

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Abstract

Availability of land for conventional air-insulated substations is becoming increasingly difficult not only in urban but also in semiurban areas. When the land made available is highly uneven, the associated technoeconomic factors favors the erection of substations on a steplike-formed ground surface and such constructions are in service for more than ten years in some parts of southern India. Noting that the literature on the performance of ground grids in such a construction is rather scarce, the present work was taken up. Evaluation of the performance of earthing elements in steplike ground forms the main goal of the present work. For the numerical evaluation, a suitable boundary-based methodology is employed. This method retains the classical Galerkin approach for the conductors, while the interfaces are replaced by equivalent fictitious surface sources defined over unstructured mesh. Details of the implementation of this numerical method, along with special measures to minimize the computation, are presented. The performance of basic earthing elements, such as the driven rod, counterpoise, and simple grids buried in steplike ground, are analyzed and compared with that for the case with uniform soil surface. It is shown that more than the earthing resistances, the step potentials can get significantly affected.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords:	Boundary conditions; conductivity; current; earthing; electrical resistance; numerical method; safety; soil; step potential; substations
Department/Centre:	Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited:	02 Jan 2016 09:35
Last Modified:	02 Jan 2016 09:35
URI:	http://eprints.iisc.ac.in/id/eprint/53013

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