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http://dx.doi.org/10.5207/JIEIE.2011.25.12.107

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

Lee, Bok-Hee (인하대학교 IT공대 전기공학부)
Seong, Chang-Hoon (인하대 대학원 전기공학과)
Yang, Soon-Man (인하대 대학원, 금호산업(주))
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.25, no.12, 2011 , pp. 107-112 More about this Journal
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.
Keywords
Grounding System; Potential Interference; Multiple Ground Rod; Resultant Ground Impedance;
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Times Cited By KSCI : 3  (Citation Analysis)
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