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

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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An Analysis on Resultant Ground Impedance Based on the Potential Interference Of Parallel Ground Rods

전위간섭을 기초로 한 병렬 접지봉의 합성접지임피던스의 분석

  • 이복희 (인하대학교 IT공대 전기공학부) ;
  • 성창훈 (인하대 대학원 전기공학과) ;
  • 양순만 (인하대 대학원, 금호산업(주))
  • Received : 2011.10.24
  • Accepted : 2011.11.16
  • Published : 2011.12.30
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Abstract

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.

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References

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  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