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전위간섭을 기초로 한 병렬 접지봉의 합성접지임피던스의 분석

An Analysis on Resultant Ground Impedance Based on the Potential Interference Of Parallel Ground Rods

  • 이복희 (인하대학교 IT공대 전기공학부) ;
  • 성창훈 (인하대 대학원 전기공학과) ;
  • 양순만 (인하대 대학원, 금호산업(주))
  • 투고 : 2011.10.24
  • 심사 : 2011.11.16
  • 발행 : 2011.12.30

초록

Multiple ground rods are commonly used to obtain the low ground impedance, but they will not reduce the ground impedance unless the spacings between the ground rods are sufficient. This paper presents the experimental results of frequency-dependent resultant ground impedance of two ground rods in parallel. The resultant ground impedance of two ground rods in parallel were measured as functions of the spacing and length of ground rods and the frequency of test currents and were discussed based on the potential interferences. As a consequence, the frequency-dependent ground impedance of single ground rod and two combined ground rods give capacitive. It was found that the effect of potential interference on the ground impedance is directly associated with the frequency-dependent ground impedance and is strong in low frequency. Also, in order to reduce the increasing rate of resultant ground impedance of two ground rods due to potential interference to within 10(%), two ground rods in parallel will be placed over one rod length apart.

키워드

참고문헌

  1. 이복희, 이승칠, "접지의 핵심 기초 기술", 도서출판 의제, pp.133-141, 1999.
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  5. 이복희, 김종호, 최종혁 "분포정수회로모델을 이용한 수직 접지전극의 접지임피던스의 분석", 전기학회 논문지 Vol.59, No 6, pp1103-1108, 2010.
  6. IEEE Std. 81.2-1991, "IEEE Guide for Measurement of Impedance and Safety Characteristics of Large, Extended or Interconnected Grounding Systems", pp.12-17, 1991.
  7. 최종혁, 최영철, 이복희, "수직 접지전극의 접지임피던스 측정에서 도전유도에 의한 오차 평가", 전기학회 논문지, Vol. 58, No. 9, pp.1778-1783, 2009.

피인용 문헌

  1. An Analysis of the Frequency-Dependent Resultant Ground Impedance of Vertical Ground Electrodes Installed in Parallel vol.26, pp.2, 2012, https://doi.org/10.5207/JIEIE.2012.26.2.099