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

Volume

10

Issue

3

fYear

1995

fDate

7/1/1995 12:00:00 AM

Firstpage

1255

Lastpage

1262

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;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.400904

Filename

400904