• Journal of Electrical Engineering and Technology
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• 제7권2호
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• pp.225-229
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• 2012

This paper proposes a reduced-scale simulator that can replace numerical analytic methods for the estimation of potential distribution caused by ground faults in various grounding systems. The simulator consists of a hemispherical electrolytic tank, a three-dimensional potential probe, a grounding electrode, and a data acquisition module. The potential distribution is measured using a potentiometer with a position-tracing function when a test current flows to the grounding electrode. Using the simulator, we could clearly analyze the potential distribution for a reduced- scale model by one-eightieth of the buried depth and length of the grounding rod and grounding grid. Once both the shape of the grounding electrode and the fault current are known, the actual potential distribution can be estimated.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.351-354
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• 2006

This paper deals with the potential interferences between ground rod and counterpoise. The ground potential rise and coefficient of potential interference were measured by using the hemispherical water tank grounding simulator and calculated from CDEGS program as functions of the configuration and size of grounding electrodes and the distance between grounding electrodes. The ground potential un and potential interference coefficient strongly depend on the distance between grounding electrodes, the arrangement and size of grounding electrodes.

• International Journal of Safety
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• 제8권2호
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• pp.9-14
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• 2009

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.

• 조명전기설비학회논문지
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• 제20권5호
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• pp.92-98
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• 2006

본 논문은 봉상접지전극 주변에서 접지전극간 전위간섭에 대해 다루었다. 접지전극 상호간의 전위간섭을 저감하는 기법을 제안하기 위해서 실규모 접지전각에서 발생될 수 있는 대지전위와 전위간섭을 이론적 해석과 축소모델 실험을 이용하여 실험적으로 분석하였다. 반구형 수조모의접지 실험장치로 접지전극 상호간 이격거리에 따른 전위 상승과 전위간섭계수를 측정하고, CDEGS 소프트웨어를 이용하여 이들 현상을 해석하였다. 그 결과 전위상승과 전위간섭계수는 접지전극의 이격거리에 강하게 의존하였으며, 실측결과는 이론적 계산결과와 잘 일치는 결과를 얻었다.