• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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• pp.426-429
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• 1999

In this paper, we have provided the measurement technique of the grounding mesh resistance by field measurements. The standard of measurement is specified in the IEEE Std 81.2-1991 and JEAC 5001-1988, which is the the fall-of-potential method by test-current injection, but this method is difficult to apply at field, where is small around a electric power substation of domestic. For the convenient measurement method, space of assistant probe and quantity of test-current injection are changed step for step. As the result, ' the proposed measurement technique of grounding mesh resistance is that the space of current and potential probes must be fixed at 150rn from a grounding mesh, the test-current injection has to keep 5A or more.

• 대한전기학회논문지:전력기술부문A
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• 제49권6호
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• pp.289-297
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• 2000

This paper presents a comparison on the resistance and characteristics of transient response of grounding systems under surge currents using frequency domain electromagnetic field analysis software package and field test. Analysis is done by computer model, based on electromagnetic field theory approach, that accurately takes into account frequency dependent characteristics of the system. The transient performance of three grounding systems is analyzed by comparison of frequency dependent impedance and the maximal transient GPR. A double exponential lighting surge current is injected at one corner of the grounding systems. The transient GPRs a rod grounding systems are higher than mesh or electrolytic grounding systems. Af field test, the results of resistance measurement and time-variant of ground resistance slightly reduce electorlytic grounding systems less than rod and mesh grounding systems.

• 조명전기설비학회논문지
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• 제25권4호
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• pp.38-44
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• 2011

Grounding electrodes with higher burial depths are evaluated to have better performance, due to the domestic practice that puts the grounding resistance as the standard of performance evaluation, while grounding resistance decreases as the burial depth increases. However, The dangerous voltage is necessary for the analysis. Because the performance evaluation of grounding electrodes should include not only grounding resistance but also the dangerous voltage(mesh voltage and step voltage). So in this paper, The dangerous voltages of mesh grounding and rod grounding were analyzed for using computer simulation and miniature grounding model.

• 조명전기설비학회논문지
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• 제24권6호
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• pp.60-66
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• 2010

국내 외 메쉬접지극은 격자형태의 등간격 접지Grid로 설계하고 있다. 격자형 접지Grid의 경우 구석의 접촉전압이 중심 부분에 비해 높아지는 문제점이 있다. 이러한 문제점을 극복하기 위해 사선형태의 접지 Grid를 사용하면 메쉬전압이 발생하는 구석부분의 면적이 감소함으로써 메쉬전압이 감소한다. 따라서 본 논문에서는 기존의 격자형태의 접지Grid의 형태와 다르게 사선형태의 접지Grid를 제안하며, 격자형태의 접지Grid와 사선형태의 접지Grid로 설계된 메쉬접지극에 동일한 접지설계제원을 적용하고 메쉬전압, GPR, 접지저항, 접지도체의 총길이를 비교 검토하여 사선형태 접지Grid의 우수성을 검증하였다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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• pp.347-350
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• 2009

기존 접지방식인 격자 메쉬접지와 제안한 방식인 사선 메쉬접지를 비교하였다. 동일 접지설계 제원을 가지고 사선 메쉬접지와 격자 메쉬접지를 비교한 결과, 최대예상 접촉전압, 접지저항, 총 접지도체의 길이 모두 감소하였다. 본문에서는 대지저항률, 매설깊이, 대지전류, 접지도체 단면적의 변화에도 사선 메쉬접지가 기존 격자 메쉬접지에 비해 우수한 성능을 나타내는 것을 시뮬레이션을 통해 증명하였다.

• 전기학회논문지
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• 제62권9호
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• pp.1308-1312
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• 2013

In this paper, carried out for optimal ground system for ensuring safety for electricity used to power equipment in the 20 kHz frequency. Now the grounding system of the mesh electrode, electrode rods are installed for power plant safety and protection against electric shock. However, the electrical equipment grounding system in the 20 kHz were considering the increasing grounding impedance due to the high frequency and the magnetic shielding. But until now, there has been little research on the grounding system. To solve this problem, In this paper was proposed optimal grounding system due to the experiment using a mesh electrode, rod electrode, aluminum plate electrodes. Measurement results, grounding resistance was depending on the material of the electrode grounding resistance. In addition, the leakage current (induced) appeared to be affected depending on the type of electrode.

• 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 2002년도 하계학술대회 논문집 A
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• pp.330-332
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• 2002

There are a lot errors and little accuracy when calculating the grounding resistance with the transposition methods in the equivalent surface of hemisphere electrode. Therefore we should calculate the grounding resistance by using the mesh factor. In this paper, we would estimated the grounding value of mesh electrode with water tank model & estimation method using the reduced scale ratio of mesh electrode based on the theory of model electrode & proportional factor according to the reduced scale ratio. And also we have confirmed the accuracy of the empirical formula of model electrode by using by regression analysis.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 학술대회 논문집 전문대학교육위원
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• pp.29-33
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• 2002

There are a lot of errors and little accuracy when calculating the grounding resistance with the transposition methods in the equivalent surface of hemisphere electrode. Therefore we should calculate the grounding resistance by using the mesh factor, In this paper, we would estimate the grounding value of mesh electrode with water tank model & estimation method using the reduced scale ratio of mesh electrode based on the theory of model electrode & proportional factor according to the reduced scale ratio. And also we have confirmed the accuracy of the empirical formula of model electrode by using the regression analysis.

• 조명전기설비학회논문지
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• 제20권3호
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• pp.28-35
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• 2006

최근들어 빌딩내에 있는 많은 전기 전자 통신설비들은 기기 보호 및 안전을 위하여 반드시 접지를 필요로 하며, 고장 전류가 같은 빌딩내에 있는 어떤 접지 시스템으로 흐를 때, 이 전류에 의한 전위상승에 영향을 받아 다른 접지시스템의 전위 상승을 유도할 수 있다. 이러한 전위간섭은 접지극의 표면전위에 의해 영향을 받으며, 전각의 형상과 깊은 관련이 있다. 본 논문에서의 기본적 공식은 전위간섭을 받는 접지극과 전위간섭의 원천이 되는 두 접지극의 표면 전위에 기초하여 추론되었으며, 다중 접지극에 있어서의 전위간섭의 정도는 미리 간단한 모델을 이용하여 시뮬레이션을 실시하였다. 이는 대지위에 설치되는 건조물의 접지저항을 추정하기 위한 것이며, 실제의 현장에서 측정한 접지 저항값과 추정값과의 일치성을 입증하기 위하여 반구형 수조에서 모의 접지시스템의 축적 모델로 실험을 행한 결과, 확실한 메쉬접지극의 접지저항을 얻을 수 있었다. 따라서 수조 모델 실험을 통하여 메쉬접지각의 접지저항을 추정할 수 있음을 보여주고 있다.