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조용승(Yong-Seung Cho),이봉(Feng Li),유재덕(Jae-Duk Yoo),김동성(Dong-Sung Kim),김기복(Ki-Bok Kim),이복희(Bok-Hee Lee) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
This paper presents the ground surface potential rises caused by a counterpoise buried in two-layered soils. To propose fundamental data relevant to the risk reduction of electric shock of human beings, the ground surface potential rises near the counterpoise were computed by CDEGS program. Touch and step voltages are calculated on the basis of the distribution of the ground surface potential rises. As a result, touch and step voltages, ground surface potential rises depend on the soil resistivity of installation point of counterpoise in the two-layered soil structure.
접지전류의 주파수에 따른 대지표면전위 상승 및 위험전압의 분석
최종혁(Jong-Hyuk Choi),조용승(Yong-Sung Cho),이복희(Bok-Hee Lee) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.4
The most important object of grounding systems is to protect human being from electric shock. Touch and step voltages are measured to evaluate the performances of grounding systems. Dangerous voltages have been largely studied by the power frequency fault currents, on the other hand, the ground current containing the high frequency components and surge currents haven't been considered. Many attempts about the grounding impedances reported in these days show that the performance of the grounding systems in high frequency range is very different with the ground resistance. It is necessary to analyze the dangerous voltages formed by the ground currents containing high frequency components. In this paper, the ground surface potential rises near the vertical and horizontal grounding electrodes are measured at the frequency of 100[Hz], 30[kHz], and 100[kHz]. Dangerous voltages are investigated with the frequency-dependent grounding impedance. As a result, the ground surface potential rise is increased as the grounding impedance increases. Touch and step voltages near the grounding electrode whose impedance increases with the frequency are sharply raised.