Testing continuity of grounding grid using the AC current injection method

Yan Ma, George G. Karady, Sadik Kucuksari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations

Abstract

We propose here a cost-effective, realistic method for testing the continuity of the grounding grid and for identifying its weak points or discontinuities. The proposed method involves injecting an ac current of ∼200 A frequency not 60 Hz or 60 Hz harmonic into a grounding grid. The purpose of the frequency setting is to be able to distinguish the magnetic field produced by the injected current when the substation is energized. The magnetic field generated by the current flowing in the buried grid conductors is then measured above the ground. A strong magnetic field indicates that the grounding grid is in good condition; a weak magnetic field indicates that some damage may exist. Two field tests were conducted to demonstrate that the proposed method works effectively in determining the continuity of the grounding grid.

Original languageEnglish (US)
Title of host publicationIEEE PES General Meeting, PES 2010
DOIs
StatePublished - Dec 6 2010
EventIEEE PES General Meeting, PES 2010 - Minneapolis, MN, United States
Duration: Jul 25 2010Jul 29 2010

Publication series

NameIEEE PES General Meeting, PES 2010

Other

OtherIEEE PES General Meeting, PES 2010
CountryUnited States
CityMinneapolis, MN
Period7/25/107/29/10

Keywords

  • Continuity
  • Grounding
  • Grounding grids
  • Substation grounding

ASJC Scopus subject areas

  • Energy Engineering and Power Technology

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