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A Study on Electrical Characteristics of Outdoor Termination with Viscosity of Insulating Oil
Jin‑Wook Choe,Seok‑Hyun Nam,Jin‑Gyu Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3
Outdoor terminations connecting overhead transmission lines and power cables comprise a stress relief cone, which is made of silicone rubber, and insulating oil in a composite or porcelain insulator. The lower the insulating oil viscosity, the greater is its ease of injection. However, the swelling and the degree of change in the electrical properties of the silicone rubber increase with a decrease in the insulating oil viscosity. Therefore, the efect of the expected change in the electrical proper‑ ties of the silicone rubber on the outdoor termination quality should be examined before choosing the insulating oil. In this study, specimens made of insulating and semiconducting silicone rubber were made to swell by impregnating them with three types of insulating oils with diferent viscosities. The AC breakdown strength of the swollen insulating specimens and the volume resistivity and relative permittivity of the semiconducting specimens were measured. The Weibull statistical analysis showed that the lower the insulating oil viscosity, the lower was the AC breakdown strength in overlapping con‑ fdence intervals. The volume resistivity and relative permittivity of the semiconducting specimens changed considerably with a change in the viscosity of the insulating oil. In particular, the volume resistivity of the specimen impregnated with the lowest viscosity insulating oil was 1.57×106 Ω m, indicating loss of semiconducting properties. Furthermore, the efect of changes in the electrical characteristics of the specimens on the outdoor termination quality was examined by performing an electric feld analysis. Compared with the other oils, impregnation with the lowest viscosity insulating oil resulted in the electric feld strength at the edge of the outer semiconducting layer increasing by 15.7%.
강진한,김홍빈,손장욱,이상오,정문현,정희진,최영화,최정현,최준용,최희정 대한감염학회 2008 감염과 화학요법 Vol.40 No.1
In 2007, the Korean Society of Infectious Diseases recommended an immunization schedule for adults residing in Korea. This recommendation includes four categories: standard immunization for healthy persons, supplementary immunization for persons with underlying illnesses, recommendations for health-care personnel and for international travelers. The Standard Immunization Schedule consists of universal vaccination (tetanus-diphtheria/tetanus-diphtheria-pertussis (Td/Tdap); hepatitis A vaccine for persons aged 20s; human papilloma virus vaccine for women under 26 years old; meningococcal vaccine for military recruits and college students in dormitories; influenza vaccination for persons aged 50 years or more and pregnant women; and pneumococcal vaccination for persons aged 65 years or more) and catch-up vaccination (hepatitis A vaccine for persons aged 30s; hepatitis B vaccine, varicella and MMR vaccines for persons who have uncertain specific immunities). The Supplementary Immunization Schedule recommends 4 vaccines, i.e., pneumococcal, influenza, meningococcal, and Haemophilus influenzae type b, appropriate to the underlying illnesses, and confirmation of the presence of antibodies to hepatitis A and hepatitis B. The Recommendation for Health-Care Personnel includes universal vaccination (influenza and pertussis) and catch-up vaccination (hepatitis B, measles-mumps-rubella and varicella for seronegative health-care personnel). The Recommended Immunization for International Travelers focuses reinforcement of vaccinations for healthy persons and includes certain immunizations necessary for international travel (yellow fever, meningococcal, plaque, tick-borne encephalitis, and cholera). These guidelines can be seen at www.ksid.or.kr.
박철연,권정석,정진욱,이충기,현대성,최정윤 영남대학교 의과대학 2008 Yeungnam University Journal of Medicine Vol.25 No.2
Dermatomyositis is characterized by progressive, symmetric, Proximal muscle weakness and a nonsuppurative inflammatory myopathy of unknown etiology involving predominantly skeletal muscles. It is also characterized by typical skin lesions. Interstitial lung disease has a poor prognosis when it is associated with dermatomyositis. Organizing pneumonia is a disease in which granulation tissue fills the lumina of terminal and respiratory bronchioles and extends into the distal airspaces. The cryptogenic nature of the process is appreciated in that organizing pneumonia patterns of injury can be seen in secondary forms of the disease (secondary organizing pneumonia). Organizin pneumonia has been reported to occur in 5~10% in dermatomyositis-polymyositis patients Anti-histidyl tRNA synthetase antibody (anti-Jo-1) is a Predictive disease marker that is reported to occur in up to 70% of patients. We describe a 49-year-old male dermatomyosits patient who presented with organizing pneumonia and was found to have negative anti-Jo-1 antibody.
에폭시 몰딩에 의한 부스바 온도 저감 효과에 관한 연구
최진욱(Jin-Wook Choe),이웅엽(Woong-Yeop Lee),남석현(Seok-Hyeon Nam),김진규(Nam?Jin-Gyu Kim) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.11
As the number of large buildings and factories that consume a lot of electric power is increased, the use of bus ducts that can flow high current is increasing. The NSPB which is mainly used to connect the transformer and the switchboard has a structure in which a three-phase bus bars are spaced apart in a single metal enclosure. The bus bars are made of bare conductors or conductors coated with an epoxy powder or a heat-shrinkable tube. Bus ducts are required to have insulation characteristics for voltage, temperature characteristics due to current and mechanical characteristics due to short-circuit electromagnetic force. In this paper, temperature characteristics of epoxy molded bus bars were investigated through experiments. The maximum temperature change of the conductor with epoxy molding, the maximum conductor temperature change with the number of conductors and the space when the epoxy molding volume was the same and the maximum conductor temperature change with increasing current were compared.
최진욱(Jin-Wook Choe),남석현(Seok-Hyun Nam),김진규(Jin-Gyu Kim) 대한전기학회 2019 전기학회논문지 Vol.68 No.9
In order to build underground the transmission line, it is necessary to install outdoor terminations that connect overhead transmission lines and underground power cables. The inside of the outdoor termination is filled with insulating oil and a stress relief cone made of silicone rubber is assembled at the end of outer semiconducting layer. Insulating oil is heated to lower viscosity prior to injection, which requires additional equipments and more time. It is necessary to examine the influence of impregnated silicone rubber on the use of low-viscosity insulating oil that can be injected without heating. In this paper, we investigated how much silicone rubber swells depending on the viscosity of three different insulating oils. The mechanical and electrical properties such as tensile strength, elongation, volume resistivity, relative permittivity, etc., of the fully swollen silicone rubber were measured. In addition, the chemical analyzes of the fully swollen silicone rubber through FTIR and TGA were performed.
최진욱(Jin-Wook Choe),이웅엽(Woong-Yup Lee),남석현(Seok-Hyun Nam),김진규(Jin-Gyu Kim) 대한전기학회 2019 전기학회논문지 Vol.68 No.11
As the competition in the electrical power cable market becomes more intense, not only the quality and the price, but also the ease assembly are becoming important. The failure in the joint and termination were caused by surface discharge along the interface of cable insulation and rubber sleeve for electric field grading. The factors affecting the surface discharge are contamination, interfacial pressure, surface roughness and lubricant. In this paper, the difference of surface roughness was investigated based on the grain size of sandpaper to simplify the cable preparation process. In addition, the influence of the factors was evaluated by the surface discharge test according to the surface roughness, the interface pressure, and the type of the lubricant.