• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1807-1809
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• 1996

The axial discharge at switching operations of EHV $SF_6$ disconnector can lead to the breakdown to the enclosure. Precursor in periphery zone leads to formation of leader over some time delay. Injected charge value depends on electric field and gap geometry. The calculation method for parameters of $SF_6$ insulation for DS in EHV-GIS is suggested by using the new criterion of leader inception in connection with periphery field nearby the boundary of streamer zone.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1467_1468
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• 2009

지중 케이블의 고정 및 케이블 축력을 지지하는 목적으로 사용하는 케이블용 클리트는 실제로 여러 종류의 외력을 받으며, 이중 케이블 단락 사고시 발생하는 전자력이 가장 큰 영향을 미친다. 본 논문에서는 케이블 단락 사고시 발생 전자력을 계산하고 이 계산치를 바탕으로 클리트의 외력으로 모의하고, 이를 외력방향에 따라 인장시험을 통해 클리트 설계의 적절성을 확인하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1469_1470
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• 2009

기존의 링크박스는 대부분 직매식으로 수침투 방지를 위해 케이스와 뚜껑 사이에 가스켓을 넣고 볼트로 체결하는 방식으로 사용하여 왔다. 이는 링크박스 유지보수 시 매번 볼트를 체결하고 해체하는 작업이 반복되어 현장 작업성이 떨어졌다. 이에 링크박스를 지상에 설치하며, 볼트의 사용을 최소화함으로써 유지보수 시 작업이 용이한 케비넷형 링크박스를 개발하였으며, 개발된 제품에 대해 전기적, 기계적 성능 시험을 수행하여 그 성능을 검증하였다.

• 한국동물위생학회지
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• 제25권4호
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• pp.333-346
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• 2002

We previously reported that the equine herpesvirus type 1(EHV-1) immediate-early protein(IE protein) physically interacts with the general transcription factor human TFIIB(Jang et al, J Virol 75：10219-10230, 2001). The interaction between the IE protein and TFIIB is necessary for the IE protein to efficiently transactivate the early TK and late IR5 EHV-1 promoters. A panel of deletion and truncation mutants of the TFIIB gene was constructed and employed in protein-binding assays to map the IE protein-binding domain within TFIIB. Evidence is presented that the first direct repeat of TFIIB interacts specifically with the EHV-1 IE protein.

• 한국전기전자재료학회논문지
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• 제14권5호
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• pp.391-396
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• 2001

The purpose of this study is to investigate the effect of hole or crack on the Insulation characteristics of a PET films for EHV(Extra High Voltage) VT winding. The hole or the crack in the PET films was made and the insulation characteristics of them were measured. Ad an experimental result, it was shown hat he PDIV(Partial Discharge Inception Voltage) and the BDV(Breakdown Voltage) of the PET films with hole or crack were lower than those without them, and were markedly dependent on their position and temperature. Therefore, the hole and the crack affected to insulation characteristics of PET films for SF$_{6}$EHV(Extra High Voltage) VT Winding.g.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2123-2125
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• 1999

In recent the XLPE cable has been applied more widely because of its advantages, such as the low-cost and simple installation. For a prefabricated joint, its working time is short, its jointing procedures aγe simple, and its quality control is easy. Electrical performance targets of our developed 66kV cable accessories has been approved through the type test in accordance with IEC publication 840. This paper describes the developmental effort in terms of the design, structure and results of performance verification tests for 66kV XLPE cable system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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• pp.1968-1970
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• 2005

송전 용량 증대 및 초고압 케이블 컴펙트화를 위해, 최근 고내력 케이블에 관한 연구가 전세계적으로 활발히 진행되고 있으며, 이러한 추세에 대응코자 당사에서는 고내력 케이블 개발에 있어서 첨가제 투입에 따른 절연 능력 향상에 관한 연구를 진행하여왔다. 본 연구에서는 케이블 절연 능력 향상을 위하여 반도전 컴파운드에 첨가제를 투입하여 반도전과 절연의 계면 특성을 향상시킴으로 절연체의 절연파괴능력 향상시키고자 하였으며, 계면 특성의 향상은 절연 파괴능력 향상으로 이어짐을 확인 할 수 있었다. 또한 상기의 연구결과에 따라 제조된 케이블은 기존 케이블과 비교하였을 때 매우 우수한 절연파괴 특성을 나타냄을 확인하였으며, 그 결과 절연 두께를 비약적으로 감소시킬 수 있었다. 본 논문은 상기 절연 성능 향상에 관한 메커니즘 및 IEC 62067에 따라 진행된 초고압 XLPE 케이블의 type test 결과를 중심으로 기술하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.784-786
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• 1996

This paper presents some stability simulations using EMTP to see the effect of EHV Lines with hybrid reclosing on power system stability. The Hybrid reclosing on EHV lines can improve the reliability of power systems. These studies is performed as a part of the research work which is aimed to find proper scheme of reclosing for EHV lines in Korea. Completing a number of simulation works with the diverse conditions such as ones reported in this paper, some decisions could be made through some stochastic approches for the simulation results for the proper scheme of reclosing for Korean systems.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
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• pp.238-239
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• 2005

With the aim of developing XLPE insulation for extra high voltage cable, we investigated the morphology of cross-linked polyethylene. We used a kind of base materials and additives, and controlled curing condition and amount of additives. The effect of addition of additives on morphology of XLPE such as lamellar density, orientation and additive layer were analyzed using TEM analysis. We applied this result to diffused additive amount was analyzed using FT-IR analysis, and the change of microstructure as the degree of additive diffusion was analyzed using TEM analysis.

• 한국동물위생학회지
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• 제43권2호
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• pp.59-65
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• 2020

The aim of the study was to investigate the seroprevalence of equine herpesvirus type 1 (EHV-1) and type 4 (EHV-4), equine influenza virus (EIV), and Streptococcus (S.) equi subspecies equi in the horse population of Jeju. Serum samples were taken from 71 horses, regularly vaccinated with EHV-1 and strangles twice (April and November) a year. In April 2014, seropositive rates of EHV-1 and strangles were 24.5% and 84.5%, while in November, were 26.8% and 62.0%, respectively. A total of 1,144 serum samples, including Jeju native horses, Halla horses, and Thoroughbred horses were collected from slaughter house for 4 years (2014 to 2017) and it is unclear the animals were vaccinated or not. The seropositive rates in Jeju was 21.9% (250/l,144) for EHV-1, 96.4% (1,103/1,144) for EHV-4, 14.6% (129/882) for EIV, and 79.3% (879/1,108) for strangles. The seropositive rate was the highest in Thoroughbred, but lowest in Hala horse.