Computation Stability of Grounding Systems in Soils Containing Heterogeneous Volumes

F.P. Dawalibi, N. Mitskevitch, and S. Fortin (Canada)


Grounding; Earthing, Soil Volumes, and Power System Planning


This paper studies the performance of grounding systems in soil structures containing heterogeneous soil volumes. This type of soil is crucial for the investigation of a range of practical problems that cannot be approximated by a layered soil structure. This type of problems involves grounding systems that are either close to, partially or totally immersed in one or several finite volumes of soil materials that have resistivity values quite different from that of the bulk volume of surrounding soil (native soil). This paper focuses on the stability of the algorithm used to compute the response of grounding grids for different scenarios. It also describes and discusses the computed results that pertain to a number of typical grounding scenarios, comparing them to some known limiting case solutions.

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