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http://dx.doi.org/10.5207/JIEIE.2010.24.4.073

Computation of the Critical Lengths of the Vertical Grounding Electrode in Multi-Layered Soil Structures  

Kim, Ki-Bok (인하대학교 대학원 전기공학과)
Joe, Jeong-Hyeon (인하대학교 대학원 전기공학과)
Lee, Bok-Hee (인하대학교 IT공대 전기공학과)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.24, no.4, 2010 , pp. 73-80 More about this Journal
Abstract
The grounding impedance is not lowered by expanding the dimension of the grounding electrode, and the length of grounding electrode which shows the minimum value of the grounding impedance for each condition of frequency and soil characteristics is existent, and it is defined as Critical Length. In this paper, a new distributed parameter circuit model considering the condition of the multi-layered soil structures was proposed, and the grounding impedance and critical length of the vertical grounding electrode were analyzed by using the newly proposed simulation model and the MATLAB program. As a consequence, it was found that the effect of the soil structure on the frequency-dependent grounding impedance and critical length of the vertical grounding electrode is significant. It is desirable to consider the soil structure in optimal design of the grounding system.
Keywords
Frequency-Dependent Grounding Impedance; Critical Length; Multi-Layered Soil Structure; Distributed Parameter Circuit Model;
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