• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 춘계학술대회 논문집 유기절연재료 전자세라믹 방전플라즈마 일렉트렛트 및 응용기술
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• pp.36-40
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• 2002

This paper presents the results of a investigation, a development of the measuring system for grounding properties in live-line. The importance of the grounding system and it's property has been increased with the development, enlarge in capacity, of electrical industry. Moreover, with the rapid growth of communication and precision industry, now, we should consider the grounding properties to ensure the stable and/or safe operation. But the conventional measuring system is not proper to measure the grounding properties of the system, voltage applied. So, in this investigation, we proposed a new method for live-line measurement and develope the system. And through the field test we could confirm the superior performance of th developed system.

• KEPCO Journal on Electric Power and Energy
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• 제6권1호
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• pp.35-40
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• 2020

The purpose of this paper is to improve the grounding point measurement method for the maintenance of the earth resistance of the distribution line. This study defines the correlation among humidity of the soil, the earth resistivity and the grounding resistance. Based on the results of the study, the grounding resistance value measurement should be limited to the location where the earth resistivity change is large, and the measurement time and cost can be greatly reduced.

• 조명전기설비학회논문지
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• 제25권11호
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• pp.91-97
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• 2011

In Korea, characterized in most cases by limited area or high earth resistivity, it is likely to design narrow distances between grounding conductors, with a view to keeping ground resistance and touch voltage below the safety margin values. A new grounding method is suggested, making use of double meshes, to lower touch voltage in a confined area, since it is difficult to lay the plugs under the ground with narrow gaps between them on a limited site. For the presentation of a new model, the suggested grounding system has been analyzed and studied in ground resistance, touch voltage and step voltage, using IEEE Std. 80 calculations and computer simulations.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 C
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• pp.1791-1793
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• 2003

In order to analyze the dynamic characteristics of ground impedance in large grounding system for lightning and surge protections, a novel method for measuring the ground impedance as a function of frequency was proposed. The experiments were carried out in the grounding system composed of ground rods and mesh grids. The test current was injected by the variable frequency inverter whose frequency is linearly controlled in the range of $5{\sim}500$kHz. The ground impedance and frequency response of the grounding system were mainly caused by the inductive current flowing through grounding conductors over the frequency of 2002. In the combined grounding system of rods and mesh grids, inductive component of ground impedance was significantly decreased. It was fumed out that the grounding system is effective for the surge protection.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.414-417
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• 2006

Especially, the case which the facilities have been shielded in the building. In this case there must be suitable grounding system, and this case must be considered sufficiently to the one part of the design at the design. in addition there must be an electric leakage defense system and The case to be a criterion signal ground system. Rod type grounding electrodes is applied much and we studied the relation that rod type grounding method and shielding room as newly grounding object. in this paper, shield room is the object(target) to be established newly additionally, we try to describe about the flow of a grounding technology concept change and a ground facilities.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.380-383
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• 2009

The grounding system of the subsurface should ensure the safe and reliable operation of power systems, and guarantee a human being's safety in the situation of grounding fault in the power system. The safety of power apparatus in the subsurface can be reached by decreasing grounding resistance and grounding potential rise of subsurface. This paper presents a method based on the design of an artificial neural network(ANN) model for modeling and predicting the relationship between the grounding resistance and temperature-humidity in the subsurface.

• 조명전기설비학회논문지
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• 제17권5호
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• pp.103-110
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• 2003

대지 저항률이 높은 암반, 사력층 지역에서의 접지 저항은 일반적인 봉형 접지 전극으로는 얻기가 거의 불가능 하며 원하는 저항값을 얻기 위해서는 깊이 매설한 접지 전극과 접지 저항 저감제를 충분하게 사용하는 코어링 접지 방식을 채택하여 시설하는 것이 적절하다고 판단된다. 본 연구는 둥가반경 개념을 이용하여 코어링 접지 전극의 반 경이 확장되는 것을 보였으며 이릎 토대로 낮은 접지 저항이 얻어지고, 제주지역과 같이 고저항 지대에서의 각 토 양의 대지 저항률을 추정함으로써 다른 고저항 지대에서의 접지공사시 개략적인 접지저항을 예측하여 기초 자료로 사용할 수 있도록 하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2149-2151
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• 1999

This paper describes the impulse response characteristics of the grounding systems in power utility system. Several regulations regarding to electric power equipments, services and managements require that the groundings of class 1 ($E_1$) and class 2 ($E_2$) must be connected at the common point in grounding systems. In addition, the grounding for arrester ($E_{LA}$), which belongs to the grounding of class 1, should be connected at the same point. However, there is no method and position of common-connection at anywhere. In this work, when the impulse current was injected through the grounding conductor for arrester, the investigations measuring and analyzing potential rises induced at the common connection point and other grounding conductors were conducted. The experiments were carried out in the conditions of the grounding conductor of 25m long and the near or remote common connection from ground electrode. The lightning impulse current was applied so as to simulate the on-set of arrester due to lightning and/or switching surges.

• 조명전기설비학회논문지
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• 제25권6호
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• pp.35-41
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• 2011

In order to design effectively the grounding system, it is very important to determine the optimum soil resistivity at the desired location of the connection to earth. This paper deals with the reasonable methods of measuring the soil resistivity where grounding electrodes are buried. The soil resistivity at three test sites with different resistivity of soil were measured as functions of the spacing between the test probes in the Wenner's four-point method and the length of test ground rod in the three-point method. In the case of the three-point method, the length of test ground rod of 2-10[m] in length was appropriate in two-layered soil structure. In the length range of 2-10[m], the results measured by the three-point method using the test ground rod with the length corresponding to the spacing between the test probes of the Wenner's four-point method are in good agreement with the data obtained from the Wenner's four-point method.

• 전자공학회논문지
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• 제51권12호
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• pp.197-203
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• 2014

뇌격전류가 정보통신설비의 접지시스템에 유입되었을 때 발생하는 과도전위상승에 대한 해석은 접지시스템을 효과적으로 설계하기 위해서 요구되는 사항 중에 하나이다. 접지시스템의 성능은 보통 접지시스템의 전기적 특성을 나타내는 접지임피던스와 과도전위상승으로 평가된다. 뇌격전류의 입사점에 따른 접지임피던스를 계산하는 방법을 제안하였다. 뇌격전류가 수평접지전극의 중앙에 입사되는 경우 델타갭소스 모델을 이용하여 접지임피던스를 계산하였다. 디바이 모델(Debye Model)을 이용하여 주파수의존적인 토양 파라미터를 적용할 수 있는 프로그램을 제안하였다. 그 이유는 접지시스템의 성능을 분석하는 상용프로그램은 주파수 의존적인 토양 파라미터 특성을 적용할 수 없기 때문이다. 동일한 조건에서의 시뮬레이션 결과의 신뢰성을 확인하기 위해서 실험을 수행하였다. 마지막으로, 토양 파라미터의 주파수의존성을 반영한 접지임피던스를 이용하여 뇌격전류파형에 따른 수평접지전극의 과도전위상승을 분석하였다.