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Investigation on the Spot for Grounding Systems in Buildings
Hyoung-Jun Gil,Dong-Woo Kim,Dong-Ook Kim,Hyang-Kon Kim 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.3
This paper deals with investigation on the spot for grounding systems of buildings based on international standards at construction sites. The investigation was carried out for grounding method, grounding type, shape of grounding electrode, grounding for a lightning protection system, continuity of steelwork in reinforced concrete structures, etc. The investigation on the spot was performed by a researcher and engineer with over fifteen years of industry experience all over the country. As a result of the investigation on the spot in 13 buildings, common grounding and structure grounding methods were dominant. The safety improvement methods include installation of equipotential bonding conductors for the connection to the main earthing terminal, equipotential bonding conductors for supplementary bonding, use of Surge Protective Devices (SPD), and safe connections between earthing conductors and the rebar.
Gil, Hyoung-Jun,Kim, Dong-Ook,Choi, Chung-Seog The Korean Institute of IIIuminating and Electrica 2008 조명·전기설비학회논문지 Vol.22 No.3
This paper deals with the assessment of potential interference between individual grounding electrodes using an Electrolytic Tank Modeling method. When a test current was passed through a grounding electrode, potential rise was measured and analyzed using an electrolytic tank in real time. In order to analyze the potential interference between grounding electrodes, a reduced scale modeling method was studied. Potential interference between isolated grounding electrodes was evaluated as a function of the separation distance between grounding electrodes and the configuration of grounding electrode to be induced. It was found that the separation distance between grounding electrodes was a major factor in reducing the potential interference.
Distribution of Potential Rise as a Function of Shape of Grounding Electrodes
Gil, Hyoung-Jun,Choi, Chung-Seog,Kim, Hyang-Kon The Korean Institute of IIIuminating and Electrica 2007 조명·전기설비학회논문지 Vol.21 No.4
In order to analyze the potential rise of grounding systems installed in buildings, a hemispherical grounding simulation system was studied. Potential rise was measured and analyzed regarding the shape and distance of the grounding electrodes by using this system. The system was composed of a hemispherical water tank, AC power supply, a movable potentiometer, and test grounding electrodes. The potential rise was measured in real time by the horizontal moving probe of be potentiometer. The test grounding electrodes were fabricated through reducing the grounding electrode installed in real buildings such as the ground rod, grounding grid and so on. The potential rise was displayed in a two-dimensional profile and was analyzed regarding the shapes of the ground electrodes. The potential rise of the grounding grid combined with a ground rod was the lowest of every grounding electrode tested. The proposed results can be applicable to evaluating ground potential rise in grounding systems, and the analytical data can be used to stabilize the electrical installations and prevent electrical disasters.
Hyoung-Jun Gil,Dong-Ook Kim,Chung-Seog Choi 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.3
This paper deals with the assessment of potential interference between individual grounding electrodes using an Electrolytic Tank Modeling method, When a test current was passed through a grounding electrode, potential rise was treasured and analyzed using an electrolytic tank in real time. In order to analyze the potential interference between grounding electrodes, a reduced scale modeling method was studied. Potential interference between isolated grounding electrodes was evaluated as a function of the separation distance between grounding electrodes and the configuration of grounding electrode to be induced. It was found that the separation distance between grounding electrodes was a major factor in reducing the potential interference.
Gil, Hyoung-Jun,Kim, Dong-Woo,Kim, Dong-Ook,Lee, Ki-Yeon,Kim, Hyang-Kon The Korean Society of Safety 2008 International Journal of Safety Vol.7 No.2
In this paper, the effects of the position and the angle of the potential probes on the measurements of the ground resistance using the fall-of-potential method are described and the testing techniques for minimizing the measuring errors are proposed. The fall-of-potential method is theoretically based on the potential and current measuring principle and the measuring error is primarily caused by the position and angle of auxiliary probes. In order to analyze the relative error in the measured value of the ground resistance due to the position of the potential probe, the ground resistance was measured for the case in which the distance of the current probe was fixed at 50[m] and the distance of the potential probe was located from 10[m] to 50[m]. Also, the potential probe was located in turn at $30[^{\circ}]$, $45[^{\circ}]$, $60[^{\circ}]$, $90[^{\circ}]$, and $180[^{\circ}]$. As a consequence, relative error decreased with increasing distance of the potential probe and decreasing angle between the current probe and potential probe. The results could help to determine the position of the potential probe during the ground resistance measurement.
Hyoung Jun Gil,Dong Woo Kim,Dong Ook Kim,Ki Yeon Lee,Hyang Kon Kim 한국안전학회(구-한국산업안전학회) 2008 International Journal of Safety Vol.7 No.2
In this paper, the effects of the position and the angle of the potential probes on the measurements of the ground resistance using the fall-of-potential method are described and the testing techniques for minimizing the measuring errors are proposed. The fall-of-potential method is theoretically based on the potential and current measuring principle and the measuring error is primarily caused by the position and angle of auxiliary probes. In order to analyze the relative error in the measured value of the ground resistance due to the position of the potential probe, the ground resistance was measured for the case in which the distance of the current probe was fixed at 50[m] and the distance of the potential probe was located from l0[m] to 50[m). Also, the potential probe was located in turn at 30[˚], 45[˚], 60[˚], 90[˚], and 180[˚]. As a consequence, relative error decreased with increasing distance of the potential probe and decreasing angle between the current probe and potential probe. The results could help to determine the position of the potential probe during the ground resistance measurement.
Study of Touch and Step Voltages with Grounding Grid Using Electrolytic Tank and Analysis Program
Gil, Hyoung-Jun,Kim, Hyang-Kon,Kill, Gyung-Suk The Korean Society of Safety 2010 International Journal of Safety Vol.9 No.2
In order to analyze the potential rise of ground surface of grounding grid installed in buildings, the grounding simulator has been designed and fabricated as substantial and economical measures. This paper describes the study of touch and step voltages with grounding grid where earth leakage current is injected. To assess risk voltage of grounding grid, the grounding simulator and CDEGS program were used to obtain measured data and theoretical results of this study. The grounding simulator was composed of an electrolytic tank, AC power supply, a movable potentiometer, and test grounding electrodes. The potential rise was measured by grounding simulator, and the touch and step voltages were computed by CDEGS program. As a consequence, the touch voltage and step voltage above the grounding grid were very low, but were significantly increased near the edge of grounding grid.
Analysis of Risk Voltage for Grounding Electrode by Injection of Earth Leakage Current
Gil, Hyoung-Jun,Kim, Dong-Woo,Kim, Dong-Ook,Lee, Ki-Yeon,Moon, Hyun-Wook,Kim, Hyang-Kon,Kil, Gyung-Suk The Korean Society of Safety 2009 International Journal of Safety Vol.8 No.2
This paper describes analysis of risk voltage for grounding electrode where earth leakage current is injected. To assess risk voltage of grounding electrode, the grounding simulator and CDEGS program were used to obtain measured data and theoretical results of this study. The grounding simulator was composed of a hemispherical water tank, AC power supply, a movable potentiometer, and test grounding electrodes. The shapes of grounding electrode model was ground rod. The potential rise was measured by grounding simulator, and the touch and step voltages were computed by CDEGS program. As a consequence, the potential rise of ground rod abruptly decreases with increasing the distance from the grounding electrode to the point to be tested. The touch voltage above the ground rod was low, but the step voltage was high. The measured results were compared with the computer calculated data and were known in good agreement.
Investigation on the Spot for Grounding Systems in Buildings
Gil, Hyoung-Jun,Kim, Dong-Woo,Kim, Dong-Ook,Kim, Hyang-Kon The Korean Institute of IIIuminating and Electrica 2010 조명·전기설비학회논문지 Vol.24 No.3
This paper deals with investigation on the spot for grounding systems of buildings based on international standards at construction sites. The investigation was carried out for grounding method, grounding type, shape of grounding electrode, grounding for a lightning protection system, continuity of steelwork in reinforced concrete structures, etc. The investigation on the spot was performed by a researcher and engineer with over fifteen years of industry experience all over the country. As a result of the investigation on the spot in 13 buildings, common grounding and structure grounding methods were dominant. The safety improvement methods include installation of equipotential bonding conductors for the connection to the main earthing terminal, equipotential bonding conductors for supplementary bonding, use of Surge Protective Devices (SPD), and safe connections between earthing conductors and the rebar.