Title :
A formula for resistance of substation grounding grid in two-layer soil
Author :
Salama, M.M.A. ; Sherbiny, M.M.E. ; Chow, Y.L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
fDate :
7/1/1995 12:00:00 AM
Abstract :
A simple and accurate formula for calculating the resistance of a grounding grid buried in two-layer soil, is proposed in this paper. The formula is derived from the image theory and a novel synthetic asymptote technique. The resulting formula is dependent on both the substation grounding grid design parameters (such as grid size, number of meshes, grid-conductor diameter, grid depth, etc.) and the soil parameters (such as the resistivities of the upper and lower soils). The resistances calculated using the proposed formula are compared to the resistances obtained from a detailed numerical method and the agreement between the results is very good
Keywords :
earth electrodes; electric resistance; soil; substations; grid depth; grid size; grid-conductor diameter; grounding grid resistance; image theory; meshes; soil parameters; soil resistivity; substation grounding grid; synthetic asymptote technique; two-layer soil; Conductivity; Electric resistance; Geologic measurements; Grounding; Performance analysis; Power engineering and energy; Printing; Societies; Soil measurements; Substations;
Journal_Title :
Power Delivery, IEEE Transactions on
