Investigating grounding grid integrity based on the current injection method

Yan Ma, George G. Karady

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

11 Scopus citations

Abstract

The purpose of this research is to develop a test method that is capable of determining the integrity of the grounding grid and clearly indentifying weak points or discontinuities. The concept of the proposed method is to inject the square wave current with high frequency (∼500Hz) and high current (∼10A maximum) into the grid. The magnetic field produced by the current flowing in the buried conductors can be measured above the grid conductor. A strong signal is indicative of no fault; no signal or very weak signal means the grid wire is damaged. The proposed method is verified using a scaled model of a grounding grid. Also, a current injection generator is built up to provide the required square wave current for the injection. The experiment in the lab showed that the proposed method works well on testing grounding grid integrity.

Original languageEnglish (US)
Title of host publication41st North American Power Symposium, NAPS 2009
DOIs
StatePublished - Dec 1 2009
Event41st North American Power Symposium, NAPS 2009 - Starkville, MS, United States
Duration: Oct 4 2009Oct 6 2009

Publication series

Name41st North American Power Symposium, NAPS 2009

Other

Other41st North American Power Symposium, NAPS 2009
CountryUnited States
CityStarkville, MS
Period10/4/0910/6/09

Keywords

  • Current injection
  • Grounding
  • Grounding grid
  • Protection
  • Substations

ASJC Scopus subject areas

  • Energy Engineering and Power Technology

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  • Cite this

    Ma, Y., & Karady, G. G. (2009). Investigating grounding grid integrity based on the current injection method. In 41st North American Power Symposium, NAPS 2009 [5484048] (41st North American Power Symposium, NAPS 2009). https://doi.org/10.1109/NAPS.2009.5484048