• Proceedings of the KIEE Conference
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• 2008.10a
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• pp.79-80
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• 2008

제주-해남간 운영중인 HVDC 해저케이블에서 발생한 절연파괴사고('06.4)와 관련하여 써징코일을 이용한 고장점 탐색을 실시하고 고장지점 추정 및 향후 대책마련에 활용하코자, 제주-해남 HVDC 해저케이블 고장점 모의용 EMPT 모델링을 개발하였으며 유인잠수정을 이용한 실측 데이터 값과 EMTP를 활용한 시뮬레이션값을 비교하였다. 향후, 다양한 HVDC 해저케이블 고장유형에 따른 과도해석용 시뮬레이션을 위하며 본 논문에서 개발한 EMTP 모델링 활용이 가능할 것으로 생각된다.

• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.138-140
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• 2006

한국전력공사(이하 한전)에서는 제주지역 전력공급의 안정을 위해 '98년부터 국내 최초로 육지전력 계통과 연계하여 장거리 해저케이블 송전선로를 건설하여 운영하고 있다. 해저케이블은 해저에 포설되고 외부적 환경에 견디기 위해 육상케이블과 다른 많은 보호층을 포함하고 있어 설비의 유지보수에 많은 제약사항을 안고 있다. 특히 해남${\sim}$제주 연계선로는 기술적 장점 때문에 AC송전 대신 HVDC 송전을 하고 있어 한단계 Upgrade된 설비운영 기술이 필요하다. 본 고에서는 HVDC 해저 케이블의 설비운영에 있어 선로의 고장시 케이블의 고장점 위치를 탐지하는데 중점을 두어 실제 고장점 탐지 사례를 중심으로 HVDC 해저 케이블 고장점 탐지 방법 및 시험 결과를 검토하고 향후 유사 고장 발생에 효과적으로 대응하기 위한 절차를 제시하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.151-153
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• 2013

최근 해양에너지플랜트 및 도서지역을 연결시키기 위한 해저 파이프라인 및 통신, 전력 케이블 매설공사가 빈번하게 이루어지고 있다. 특히, 연안항로를 가로지르는 해저케이블 매설공사에는 준설장비를 동원하여 해저부를 굴착하고 케이블을 부설한 후 상단을 덮어 보호하는 일련의 작업과정이 행해지며 이 과정에서 해저저질의 상태, 준설심도, 조류 또는 연안류의 흐름강도, 수심, 통항선박 등 다양한 조건에 따라 단면의 굴착심도 및 폭이 결정되며, 작업의 순서 또는 방법에 따라 여굴의 정도도 변하게 된다. 본 연구에서는 우리나라 서해안 실제해역에서 연안 도서를 연결하는 전력, 통신망의 개통을 위한 해저케이블 부설과 관련한 굴착단면의 실태를 실제 현장여건과 관련해서 적정단면과 준설물량의 산정을 다루어 해저환경변화에 대처하기 위한 기초자료를 제공하고자 하였다. 이를 위하여 대상해역에서 주요설계 지침에 따른 해저부 굴착단면의 평가와 적정단면을 검토하였으며, 이 단면에 따른 준설 적정물량을 산정하여 작업공정에 활용할 수 있도록 하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.239-240
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• 2015

This paper presents the transient state characteristic and single phase ground fault occurred by deterioration of surge arrester when offshore wind turbine is struck by lightning strike. The wind turbine and submarine cable data are based on the 2.5GW offshore wind farm planned in South Korea Southwest Seashore. During lightning strikes, additional ground fault can lead to damage of the generation components. So, the sensitive analyses are conducted in order to investigate the effects of lightning strike on offshore wind farm.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1094-1095
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• 2015

The costs of installation, loss, and energy not supplied energy for submarine cable of offshore wind power plant (OWPP) are very high because the level of technology is still in the early stage as well as because of the marine environments. Therefore, reducing the total costs of a grid network for OWPPs is very important for financial feasibility. In particular, it is needed to minimize the project cost for optimizing the grid design and offshore substation location of a OWPP. The suggested method can reduce the total system cost and make it lower compared with existing methods.

• Proceedings of the KIEE Conference
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• 1994.07b
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• pp.1655-1657
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• 1994

To measure treeing, visual measurement with an optical microscope has been used to explain breakdown mechanism by treeing in materials. The conventional direct visual method of tree deterioration observation is difficult to measure in short time processing, and impossible to analyze the deteriorated area by treeing, direction of tree growth, tree patterns etc. In this paper, we have developed a tree-measuring system using image processing for the tree growth, the area of deterioration, and other progresses of treeing. As experimental result, image processing is an effective alternative to direct visual observation method.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.2
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• pp.109-118
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• 2010

Yeosu area from the old historical monuments and artifacts related communications signal station, directions display panels, lighthouse, Geomundo the first submarine cable installation, etc. The historical value of the communication is present. Therefore, tourism and culture industries in conjunction with the Communication Museum and Science Center was established to recognize the importance of communication and utilizing the Superintendent to allow residents and people contributing to the establishment to promote.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.5
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• pp.603-610
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• 2011

Yeosu area from the old historical monuments and artifacts related communications signal station, directions display panels, lighthouse, Geomundo the first submarine cable installation, etc. That appears in old documents and communications of the area should check the history and development of communication in understanding the Yeosu area and communicate the need to identify resources historicity.

• Journal of the Korea Institute of Military Science and Technology
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• v.5 no.2
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• pp.50-61
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• 2002

In this study, 3-dimensional virtual visualization was performed for a rapid and accurate analysis of sea bottom topography, The visualization was done through the extracted data using the developed program and the generated data using the gridding method. The data extraction program was developed with AutoLISP programming language and this program was able to extract the needed sample bathymetry data from the electronic sea chart systematically as well as effectively. The gridded bathymetry data were generated by the interpolation or extrapolation method from the spatially-irregular sample data. As the result of realization for the 3-dimensional virtual visualization, it was shown a proper feasibility in the analysis of the sea bottom topography to determine the route of submarine cable burial.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.51 no.2
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• pp.74-79
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• 2002

We have been analyzed the interference problems already in steady state, especially AC corrosion when the gas pipeline is burred with power cable in the same submarine tunnel. In the next stage, we analyze the induced voltage in a fault condition of 154[kV] underground T/L. This paper presents the results of them which are limitation of safety voltage. meodeling of power cables, gas pipeline and grounding systems, analysis of induced voltage in a fault condition, and protection of Power line system.