A new method to decrease ground resistances of substation grounding systems in high resistivity regions

Author

Meng, Qingbo ; He, Jinliang ; Dawalibi, F.P. ; Ma, J.

Author_Institution

Northeast China Power Bur., Shenyang, China

Volume

14

Issue

3

fYear

1999

fDate

7/1/1999 12:00:00 AM

Firstpage

911

Lastpage

916

Abstract

Decreasing the ground resistance of a grounding system in high resistivity soil is often a formidable task. A new method is proposed to decrease ground resistances. This method requires three steps: (1) drilling deep holes in the ground; (2) developing cracks in the soil by means of explosions in the holes; and (3) filling the holes with low resistivity materials (LRM) under pressure. Most of the cracks around the vertical conductors will be filled with LRM and a complex network of low resistivity tree-like cracks linked to the substation grid is formed. The principle of decreasing ground resistances using this new method is described and the effectiveness of the new method is examined. Application of this method to power system grounding is presented together with measurement results

Keywords

cracks; earthing; electric resistance; electrical resistivity; soil; substations; deep holes drilling; explosions; ground resistances decrease; high resistivity regions; holes filling; low resistivity materials; low resistivity tree-like cracks; soil cracks development; substation grid; substation grounding systems; vertical conductors; Complex networks; Conducting materials; Conductivity; Drilling; Explosions; Filling; Grounding; Power system measurements; Soil; Substations;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.772333

Filename

772333