• Title, Summary, Keyword: EHV

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Characteristics on Equine Herpesvirus Type 3 from Korea (국내분리 말구진 원인병원체(Equine herpesvirus type 3)의 특징)

  • Yang, Jae-Hyuk;Lim, Yoon-Kyu
    • Journal of Life Science
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    • v.21 no.8
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    • pp.1156-1162
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    • 2011
  • Equine coital exanthema caused by equine herpesvirus type 3 (EHV-3) is a venereal disease which seriously drops horse reproduction rates. Here, we isolated EHV-3 from infected horses and investigated their biological characteristics. Initial cytopathic effects such as rounding of cells were detected 48 hours post infection of the virus into RK-13 cells. The infected cells were going to detach from the surface of culture flasks 72 hours post infection. The type of isolated viruses from swabbed samples was EHV-3 by PCR analysis. Glycoprotein G (gG) of isolated EHV-3 has a 99.25 percent similarity rate to that of EHV-3 334/74 control strain. The isolated EHV-3 was named Georo strain. Georo strain consisted of four major proteins including 145 kD, 60 kD, 45 kD and 40 kD, as shown by SDS-PAGE analysis. We hope the newly isolated Georo strain of EHV-3 can be used for studying various aspects of Korean equine coital exanthema.

Development of Pre-Molded Joint for EHV XLPE Power Cable (삽입형 고무몰드접속함 개발)

  • Kim, H.J.;Kang, B.K.;Song, J.H.;Choi, M.O.;Han, J.H.
    • Proceedings of the KIEE Conference
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    • pp.2256-2258
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    • 2005
  • 우리는 기존의 현장몰드방식의 TMJ(Tape Molded Joint)와 부품조립방식 의 PJ(Prefabricated Joint) 보다 조립시간과 숙련도가 덜 필요한 고무몰드접속함을 탄성 및 우수한 절연특성을 가진 silicone 고무를 사용하여 조립공정과 절연특성, 탄성특성, 계면특성, 열적 특성 등을 연구하여 개발에 성공하였다. 고무 몰드 접속함은 실리콘 재료의 우수한 탄성에 의해 동일 케이블의 다양한 size에 적용이 가능하다.

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Development of Pre-molded Joint for 230kV XLPE Power Cable (230kV XLPE 삽입형 고무몰드 접속함의 개발)

  • Kim, H.J.;Kim, H.J.;Kim, S.Y.;Song, J.H.;Han, J.H.;Lee, H.L.;Kim, D.H.
    • Proceedings of the KIEE Conference
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    • pp.1564-1565
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    • 2006
  • 현재 전세계적으로 170kV급 이하의 초고압 지중케이블 접속함으로 기존의 현장몰드방식의 TMJ(Tape Molded Joint)와 부품조립방식의 PJ(Prefabricated Joint)보다 조립시간이 짧고 작업자의 숙련도가 높지 않아 경제적이며, 유지보수에 장점을 가진 고무몰드 접속함(PMJ)이 채용되고 있으며, 이러한 추세는 적용 전압급이 점차 상승하면서 230kV급까지 그 비중이 늘어나고 있는 경향을 보이고 있다. 당사에서는 이러한 추세에 발맞추어 154kV급 고무몰드접속함의 개발 당시의 Silicone의 기초물성시험 DATA 획득, 고무몰드 UNIT 및 금형 설계 기술 확립과 접속 공법 개발의 경험을 바탕으로 230kV급 고무몰드접속함의 개발에 성공하였다.

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Studies on isolation of rhinopneumonitis virus from Korean horses and its immunogenicity II. Studies on characters and immunogenicity of equine herpesvirus (국내 말로부터 비폐렴바이러스의 분리 및 면역원성에 관한 연구 II. 국내 분리 말 비폐렴바이러스의 특성 및 면역원성 조사)

  • Cho, Gil-jae;Kim, Bong-hwan;Lee, Du-sik;Oh, Moon-you;Ko, Mi-hee
    • Korean Journal of Veterinary Research
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    • v.35 no.4
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    • pp.743-752
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    • 1995
  • The study was carried out to characterize the properties of Korean isolates of EHV from aborted fetuses and determine envelope protein profiles. The results obtained were summarized as follows; 1. Two strains of EHV was isolated from 2 liver samples among 10 aborted fetuses from which the virus isolation was attempted. 2. Morphological and some enzymatic properties of the Korean isolates of EHV which was designated as $LC_1$ and $LC_2$ was identical to those of a reference strain of Australia-N of EHV-1. The Korean isolates of EHV could be propagated on ED cell culture and they formed typical plaques 1 to 2 days after infection in the ED cells from which typical cuboidal particles of 150~170 nm diameter herpesvirus were observed. The virus could be detected specifically from neucleus and cytoplasm of infected cells by flourescent antibody technique using FITC labelled anti-Aust IV(EHV-1) antiserum. The Korean isolates, $LC_1$ and $LC_2$ were specifically neutralized by anti Aust IV antiserum and reacted positively to CELISA. 3. The structural polypeptides of purified enveloped virions of $LC_1$ and $LC_2$ isolates of EHV were determined by SDS-polyacrylamide gel electrophoresis to identify the envelope glycoproteins. $LC_1$ and $LC_2$ strains revealed 14 glycoproteins ranging in molecular weight from 190 kD to 31 kD while 17 structural proteins of Aust IV(EHV-1), of which 14 were identical to those of $LC_1$ and $LC_2$, were identified. Upon immunoblotting by rabbit antiserum against EHV isolates and EHV-1(Aust IV), 4 immunogenic proteins of $LC_1$ and $LC_2$ were 135 kD, 88 kD, 64 kD and 59 kD, of which 135 kD, 88 kD and 64 kD proteins were also found in Aust IV(EHV-1).

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Applications of the Silicone Rubber in EHV Electric Appliances (초고압 전력기기에서의 실리콘 고무 응용)

  • 김영호;지응서;박현득;허근도
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.560-564
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    • 1999
  • In general, the main dielectric materials for EHV electric appliances were epoxy, EPDM and Silicone rubber. The Silicone rubber has been rosed so many among them in EHV appliances in the worldwide, especially in Europe and North America. The reason why it is very stable in the thermal, mechanical and electrical environment. Therefore it is still becoming increasingly widespread in the application of the EHV appliances as a main dielectric material. On this study, investigated about real appliances and tested on basic properties of the Silicone rubber compared to organic dielectric material that is EPDM. At the result, the Silicone rubber is more dominant as main dielectric material for EHV appliances than any other organic polymers.

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Development of 132kV XLPE Cable Composite Bushing EB-A (132kV XLPE Cable용 Composite Bushing 기중종단접속함 개발)

  • Kim, J.H.;Oh, E.J.;Kim, K.Y.;Park, J.K.;Jeoung, Y.W.
    • Proceedings of the KIEE Conference
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    • pp.547-549
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    • 2000
  • Silicone insulators have many advantages over porcelain insulators. Especially silicone insulators have good characteristics of impact hardness, surface insulation, ease of processing, mass productivity and don't have risk of bombardment and vandalism. Recently insulation part made by silicone are becoming widely used. In this paper we introduce the development of Sealing End for 132kV XLPE cable with silicone composite hollow insulator and the adoption of it to a actual transmission line in abroad. This paper contains of design procedure, structure, electrical performance of it.

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A diagnosis of equine herpesvirus type 1 (EHV-1) myeloencephalopathy using real-time PCR (Real-time PCR에 의한 equine herpesvirus type 1 (EHV-1) myeloencephalopathy의 진단)

  • Choi, Seong-Kyoon;Kim, Joo-Hyung;Cho, Gil-Jae
    • Korean Journal of Veterinary Service
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    • v.37 no.1
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    • pp.59-65
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    • 2014
  • Equine herpesvirus myeloencephalopathy, out of symptoms by equine herpesvirus type 1 (EHV-1) infection, can cause devastating losses on individual farms. Although myeloencephalopathy syndromes of horses in Korea have been recognized for a couple of years in horse populations, there is little study regarding the occurrence of EHV-1 infections. The present study was performed to detect the viral infection of horses with neurological syndrome using real-time PCR. Fifteen horses (27.3%) out of 55 horses with neurological deficiency were positive for EHV-1 viral antigen. Among these 7 horses, 4 horses were detected genotype of A2254/N752 and 3 horses G2254/D752 strain, respectively.

Development of Pre-molded Joint for 400kV XLPE Power Cable (400kV XLPE 삽입형 고무몰드 접속함의 개발)

  • Kim, H.J.;Kim, H.J.;Kim, S.Y.;Song, J.H.;Kim, D.H.
    • Proceedings of the KIEE Conference
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    • pp.1385-1386
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    • 2007
  • 전통적으로 초고압 지중케이블 접속함으로 현장에서 절연을 형성하여 전기적 성능을 유지하는 TMJ(Tape Molded Joint), TJ(Taped Joint), EMJ(Extruded Molding Joint) 및 공장에서 절연물을 가공하여 현장에서 조립만으로 설치를 완료하게 되는 PJ(Prefabricated Joint), PMJ(Pre-Molded Joint) 등이 사용되어 왔다. 최근에 PMJ에 사용되는 재료의 발전과 PMJ의 조립시간 단축, 원가 절감 및 공장 출하시 검사에 의한 신뢰성 향상으로 지중케이블 접속함 시장에서 PMJ의 비중이 점차 확대 되어가고 있다. 이에 당사는 이미 230kV급 PMJ의 개발을 완료하였으며, 이러한 기술적 배경을 바탕으로 현재 PMJ로서는 세계에서 최고 전압급에 속하는 400kV급 PMJ의 개발을 완료하게되었다.

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A 3-D Steady-State Analysis of Thermal Behavior in EHV GIS Busbar

  • Lei, Jin;Zhong, Jian-ying;Wu, Shi-jin;Wang, Zhen;Guo, Yu-jing;Qin, Xin-yan
    • Journal of Electrical Engineering and Technology
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    • v.11 no.3
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    • pp.781-789
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    • 2016
  • Busbar has been used as electric conductor within extra high voltage (EHV) gas insulated switchgear (GIS), which makes EHV GIS higher security, smaller size and lower cost. However, the main fault of GIS is overheating of busbar connection parts, circuit breaker and isolating switch contact parts, which has been already restricting development of GIS to a large extent. In this study, a coupled magneto-flow-thermal analysis is used to investigate the thermal properties of GIS busbar in steady-state. A three-dimensional (3-D) finite element model (FEM) is built to calculate multiphysics fields including electromagnetic field, flow field and thermal field in steady-state. The influences of current on the magnetic flux density, flow velocity and heat distribution has been investigated. Temperature differences of inner wall and outer wall are investigated for busbar tank and conducting rod. Considering the end effect in the busbar, temperature rise difference is compared between end sections and the middle section. In order to obtain better heat dissipation effect, diameters of conductor and tank are optimized based on temperature rise simulation results. Temperature rise tests have been done to validate the 3-D simulation model, which is observed a good correlation with the simulation results. This study provides technical support for optimized structure of the EHV GIS busbar.

Precursor Discharge Mechanism under EHV in $SF_6$ Gas (초고압 $SF_6$가스중의 선구방전기구)

  • Lee, H.H.;Borin, V.N.;Varivodov, V.N.
    • Proceedings of the KIEE Conference
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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.

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