International Journal of Safety

The Korean Society of Safety (한국안전학회)
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Study of Touch and Step Voltages with Grounding Grid Using Electrolytic Tank and Analysis Program

  • Gil, Hyoung-Jun (Electrical Safety Research Institute, a subsidiary of Korea Electrical Safety Corporation) ;
  • Kim, Hyang-Kon (Electrical Safety Research Institute, a subsidiary of Korea Electrical Safety Corporation) ;
  • Kill, Gyung-Suk (Department of Electrical Engineering, National Korea Maritime University)
  • Received : 2010.03.12
  • Accepted : 2010.09.02
  • Published : 2010.12.31
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Abstract

In order to analyze the potential rise of ground surface of grounding grid installed in buildings, the grounding simulator has been designed and fabricated as substantial and economical measures. This paper describes the study of touch and step voltages with grounding grid where earth leakage current is injected. To assess risk voltage of grounding grid, the grounding simulator and CDEGS program were used to obtain measured data and theoretical results of this study. The grounding simulator was composed of an electrolytic tank, AC power supply, a movable potentiometer, and test grounding electrodes. The potential rise was measured by grounding simulator, and the touch and step voltages were computed by CDEGS program. As a consequence, the touch voltage and step voltage above the grounding grid were very low, but were significantly increased near the edge of grounding grid.

Keywords

Acknowledgement

Supported by : KETEP

References

  1. Hyoung-Jun Gil, Dong-Ook Kim, Chung-Seog Choi, "Research on Assessment of Potential Interference between Individual Grounding Electrodes Using an Electrolytic Tank Modeling Method", The Korean Institute of Illuminating and Electrical Installation Engineers, Vol.22, No.3, pp. 27-33, 2008. https://doi.org/10.5207/JIEIE.2008.22.3.027
  2. R. Zeng, J. He and Z. Guan, "Novel Measurement System for Grounding Impedance of Substation", IEEE Trans. Power Delivery, Vol.21 , No.2, pp. 719-725, Apr. 2006. https://doi.org/10.1109/TPWRD.2006.870980
  3. Hyoung-Jun Gil, Dong-Woo Kim, Dong-Ook Kim, Ki-Yeon Lee, Hyun-Wook Moon, Hyang-Kon Kim, Gyung-Suk Kil, "Analysis of Risk Voltage for Grounding Electrode by Injection of Earth Leakage Current", International Journal of Safety, pp.9-14, 2009.
  4. R. Cadecott, D.G. Kasten, "Scale Model Studies of Station Grounding Grids", IEEE Trans. PAS., Vol. PAS-102, No. 3, pp.558-566, 1975.
  5. Jiri George Sverak, "Progress in Step and Touch Voltage Equations of ANSI/IEEE Std 80 - Historical Perspective", IEEE Transactions on Power Delivery, Vol.13, No.3, pp. 762-767, 1998. https://doi.org/10.1109/61.686972
  6. IEEE Std 81-1983, "IEEE Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System", pp. 19-23, 1983.
  7. Gang Yu, Jinliang He, "The Relationship between Grounding Resistance and Touch Voltage of Substation Grounding System", Proceedings of the XIVth International Symposium on High Voltage Engineering, pp. 1-4, 2005.
  8. F. Dawalibi, D. Mukedkar, "Optimum Design of Substation Grounding in a Earth Structure : Part II-Comparison between Theoretical and Experimental results", IEEE Trans. PAS., Vol. PAS-94, No. 2, pp. 262-266, 1975.