Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
권호 표지
DOI QR코드

DOI QR Code

A Method for Evaluating Electric Shock Hazards Based on Human Body Current

인체전류를 기반으로 하는 감전의 위험성 평가방법

  • 이복희 (인하대학교 IT공대 전기공학부) ;
  • 유양우 (KD 파워주식회사, 인하대학교 대학원) ;
  • 최종혁 (인하대대학원 전기공학과)
  • Received : 2011.03.31
  • Accepted : 2011.04.25
  • Published : 2011.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

In order to mitigate the possible hazards from electric shock due to the touch and step voltages, the high resistivity material such as gravel is often spread on the earth's surface in substations. When the grounding electrode is installed in two-layer soil structures, the surface layer soil resistivity is different with the resistivity of the soil contacted with the grounding electrodes. The design of large-sized grounding systems is fundamentally based on assuring safety from dangerous voltages within a grounding grid area. The performance of the grounding system is evaluated by tolerable touch and step voltages. Since the floor surface conditions near equipment to be grounded are changed after a grounding system has been constructed, it may be difficult to determine the tolerable touch and step voltage criteria. In this paper, to propose an accurate and convenient method for evaluating the protective performance of grounding systems, the propriety of the method for evaluating the current flowing through the human body around on a counterpoise buried in two-layer soils is presented. As a result, it is reasonable that the grounding system performance would be evaluated by measuring and analyzing the current flowing through the human body based on dangerous voltages such as the touch or step voltages and the contact resistance between the ground surface and feet.

Keywords

References

  1. 이복희, 이승칠, “접지의 핵심 기초 기술”, 도서출판 의제, pp.25-64, 1999.
  2. International Standard IEC 61936-1, “Power installations exceeding 1 kV a.c. - Part 1: Common rules”, 2nd ed. pp.84-88, 2010.
  3. 高僑健彦, “接地․等電位ボMソaディング設計の實務知識”, オ-ム社, pp.27-48, 2003.
  4. Kosztaluk, R., Mukhedkar, R. Gervais, Y., “Field Measurements of Touch and Step Voltages”, IEEE Trans. on PAS, Vol 103, No. 11, pp.3286-3294, 1984. https://doi.org/10.1109/TPAS.1984.318571
  5. Chow, Y.L., Salama, M.M.A., Djogo, G., "Thevenin source resistances of the touch, transferred and step voltages of a grounding system", IEE PGTD, Vo. 146, No. 2, pp.107-114, 1999. https://doi.org/10.1049/ip-gtd:19990038
  6. H. Zhao, H. Griffiths, A. Haddad, A. Ainsley, “Safety-limit curves for earthing system designs: appraisal of standard recommendations”, IEE Proc.-Gener. Transn. Distrib. Vol. 152, No. 6, pp.871-879, 2005. https://doi.org/10.1049/ip-gtd:20050007
  7. C. H. Lee and A.P. Sakis Meliopoulos, “Comparison of touch and step voltages between IEEE Std 80 and IEC 479-1”, IEE Proc.-Gener. Transn. Distrib. Vol. 146, No. 6, pp.593-601, 1999. https://doi.org/10.1049/ip-gtd:19990586
  8. 최종혁, 최영철, 이복희, “수직 접지전극의 접지임피던스 측정에서 도전유도에 의한 오차 평가”, 대한전기학회 논문지,Vol. 58 No. 9, pp.1778-1783, 2009.
  9. Kosztaluk, R., Mukhedkar, R. Gervais, Y., "Field Measurements of Touch And Step Voltages", IEEE Trans. on PAS, Vol 103, No. 11, pp.3286-3294, 1984. https://doi.org/10.1109/TPAS.1984.318571
  10. IEEE Std. 80-2000, “IEEE Guide for Safety in AC Substation Grounding”, pp. 16-29, 2000.
  11. IEEE. Standard Board, “IEEE Guide for Measurement of Impedence and Safety Characteristics of Large, Extended or Interconnected Grounding System”, IEEE Std 81-2, pp.51-56. 1991.