Efficient ground grid designs in layered soils

Author

Lee, Hyung-Soo ; Kim, Jung-Hoon ; Dawalibi, Farid P. ; Ma, Jinxi

Author_Institution

Korea Ind. Safety Corp., Inchon, South Korea

Volume

13

Issue

3

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

745

Lastpage

751

Abstract

A detailed analysis of the effects of ground grid configuration on grounding performance has been carried out for uniform and horizontally stratified soils with multiple layers. The results of the analysis reveal that the most efficient and cost-effective design is highly dependent on soil structure type and characteristics. In the absence of ground rods, grounding grids with uniform mesh size are quite efficient in soils having a thin (relative to grid size) high resistivity (relative to the lower layers) top soil, while grids with small mesh size at the periphery of the grid provide optimum performance in uniform soils and soils with low resistivity top soils. Ground rods were found to be effective only when a significant portion of their length is in contact with a low resistivity soil, as expected

Keywords

earth electrodes; electrical conductivity; soil; computerised parameteric analysis; ground grid designs; ground potential rise; grounding performance; horizontally stratified soils; layered soils; multiple layer soil; small mesh size grids; soil structure type; thin high resistivity top soil; touch voltages; uniform mesh size; uniform soils; Conductivity; Conductors; Grid computing; Grounding; Guidelines; Load flow; Load flow analysis; Safety; Shape; Soil;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.686969

Filename

686969