• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 학술대회 논문집
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• pp.305-308
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• 2004

There are ground facility of maintenance in house electric facility of infra maintenance electric home appliances having used multifariousness in house, that use electric energy of common source for equipment. The body of building such as the reinforced concrete construction is structurally united, and the electric resistance is also small. It is possible that those foundations have contacted the ground at large surface area and that it substitutes the building construction body for the earth electrode. This is called "the structure earthing". This method has been defined at electrical facilities technical standards and KS in our country, and it has been used in various quarters practically. However, in our country, there is no example of using the foundation of the house as substitution earth electrode practically, and the means of the evaluation as electrode has not been established either. Then, in this paper, basic research for utilizing foundation of the house as substitution earth electrode is carried out.

• 조명전기설비학회논문지
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• 제24권3호
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• pp.39-45
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• 2010

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.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 A
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• pp.349-351
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• 2001

Because of the continuous growth of energy consumption and also the tendency to site power lines and pipelines along the same route, the close proximity of power lines and buried metallic pipelines has become more and more frequent. Therefore there has been and still is a growing concern about possible hazards resulting from the influence of power lines on metallic pipelines. When a ground fault occurs in an electrical installation the current flowing through the earthing electrode produces a potential rise of the electrode and of the neighbouring soil with regard to a remote earth. This paper analyzes the effects of ground faults when the current will flow into the soil from the foot of 345kV transmission line tower.

• 지구물리와물리탐사
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• 제4권3호
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• pp.59-69
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• 2001

2차원 전기비저항 탐사에 일반적으로 사용되는 전극배열들의 단점을 보완하기 위해 단극과 쌍극자를 사용하는 기존의 전극배열로부터 5 종류의 변형된 전극배열법을 제안하였다. 변형된 단극 배열법은 원거리 접지전극이 필요한 단극 배열법의 비효율성을 보완하기 위한 전극배열법이다. 4 종류의 쌍극자를 이용하는 변형된 전극배열법은 쌍극자 또는 단극-쌍극자 배열이 갖는 문제점, 즉 낮은 측정값에 의한 낮은 신호대 잡음비를 개선하여 높은 측정값의 획득이 가능하도록 설계하였다. 수치 모델링과 2차원 역산을 이용한 수치 실험을 수행하였으며, 전기적 잡음에 의한 영향과 분해능에 대하여 고찰하여 본 논문에서 제안된 전극배열의 효용성을 입증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2020년도 전력전자학술대회
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• pp.13-15
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• 2020

극성이 일정한 주기로 교번되는 교류 접지 환경과 달리, 직류 접지 환경에서 접지극은 지속적으로 (+) 또는 (-) 극성을 유지하게 된다. 이때 (+) 극성을 가지는 접지극은 산화반응에 의해 전식이 진행된다. 이러한 (+) 접지극의 전식을 막기 위해, 보호전극을 사용하여 (+) 접지극에 흐르는 누설전류의 극성과 반대로 직류전류를 흘려줌으로써 (+) 접지극에 흐르는 전류가 0A가 되도록 할 수 있다. 하지만 (+) 접지극을 보호하는 과정에서 보호전극은 산화반응으로 인한 전식 현상이 발생하여 손상이 진행된다. (+) 접지극을 전식으로부터 보호하면서도 보호전극의 사용 수명을 연장시키기 위해, 보호전극에 흐르는 전류의 평균값이 (+) 접지극에 흐르는 누설전류의 크기와 같으면서 PWM 펄스파형의 형태가 나타나도록 하였다. 본 연구에서는 일정 시간 동안 보호극 전원의 주파수에 따른 보호극의 전식정도를 실험을 통해 분석하였다. 실험에서 PWM 펄스파형의 주파수는 0.1Hz, 1Hz, 8Hz, 10Hz, 20Hz, 50Hz, 100Hz, 1kHz를 고려하였다. 실험 및 분석을 통해 저압직류(LVDC) 접지 환경에서 (+) 전극 및 보호전극의 전식손상을 낮출 수 있는 최적의 주파수 조건을 제시한다.

• 한국안전학회지
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• 제31권1호
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• pp.48-53
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• 2016

This paper deals with analysis of complex grounding system using electromagnetic simulation method. Electrical devices could be damaged by transient voltage such as a lightning surge. Therefore the measures to protect the equipments from transient, such as a lightning are required. The ground system is important in this respect. The representative parameter of grounding system performance is earth ground resistance. Precise prediction of earth resistance is required, because it is difficult to modify and change after the completion of the grounding system construction. Numerical modeling is often used in numerical analysis to identify the electrical characteristics of the grounding system. However complex systems are difficult to predict grounding characteristics by numerical analysis. If the total electric field of the earth in general is similar to the antenna model, in that the incident electric field and expressed as a sum of the scattering field. In this study, the electromagnetic field simulation tool "ANSYS HFSS" module containing the antenna model was used to analyze performance of ground system. Both the simple and complex grounding system were analyzed by simulation tool and experimental method. As a result simulation method is effective to predict performance of a complex ground system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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• pp.379-381
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• 2003

The sharing of common corridors by electric power transmission lines and pipelines is becoming more common place. However, such corridor sharing can result in undesired coupling of electromagnetic energy from the power lines to the near facilities. This causes induced voltages on underground metallic pipelines due to the power line currents. This could cause AC corrosion in the pipeline, which could in turn lead to disastrous accidents, such as gas explosion or oil leakage. This paper investigates for the limitation of induced voltage on the buried metal structures which is used in the inside and outside of the country. And then we measure the earth resistance and leakage current of 22.9kV distribution lines and pipe to soil potential of near pipelines in Seoul Korea. Hereby we can see the leakage current flowing through the earthing electrode have an effect on near pipelines.