• 제목/요약/키워드: Insulation Resistance

검색결과 513건 처리시간 0.029초

섬유질 단열재의 열적 특성 및 내화성능 (Thermal Property and Fire Resistance of Cellulose Insulation)

  • 권영철;서성연;김성용
    • 한국구조물진단유지관리공학회 논문집
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    • 제9권3호
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    • pp.203-212
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    • 2005
  • 섬유질 단열재는 주로 폐신문지로 만드는 데, 내화성능을 위해 내화재로 처리된다. 내화재로 인해 연소가 되지 않을 뿐 아니라, 연기도 나지 않는다. 섬유질 단열재의 열저항은 유리섬유나 암면보다 더 뛰어나다. 섬유질 단열재는 폐지로 만들어지므로 폐기시에는 잘 부식되고, 내재에너지 또한 매우 작은 친환경 단열재이다. 국내 건축물에 섬유질 단열재를 광범위하게 이용하기 위해서는 국내 건축법규 상의 단열규정에 적합한지 여부를 판단할 수 있는 물리적 성능 테스트가 필요하다. 따라서 국내에서 생산되는 섬유질 단열재에 대한 열전도율 및 내화성능 실험을 ASTM C 518과 ASTM C 1485에 근거하여 실시하였다. 국내생산 섬유질 단열재는 동일밀도의 미국제품에 비해 열전도율이 약 5%정도 높게 나타났다. 이러한 결과는 폐지원지의 섬유질이 서로 다른데서 기인하는 것으로 판단된다. 습식분사방식과 공기충진방식 모두 온도가 $5.5^{\circ}C$ 상승할 때 마다 약 1.5%씩 열전도율이 높아지는 것으로 나타났다. 섬유질 단열재의 내화성능은 내화재의 함유량에 비례하여 일정하게 증가되는 것으로 나타났다. 높은 내화성능으로 인해 불에 약한 우레탄폼이나 스치로폼을 대체할 수 있다. 섬유질 단열재의 열전도율은 시편의 온도가 $4-43^{\circ}C$인 경우 $0.037-0.043W/m{\cdot}K$로 나타났다. 이는 국내 건축법규 상의 "나"등급에 해당하는 값이다. 내화재가 열전도율에 미치는 영향은 미미하였으며, 내화재가 전혀 들어있지 않은 경우가 가장 열전도율이 높게 나타났다. 섬유질 단열재의 단열성능은 유리섬유나 암면에 비해 뛰어나고, 스치로폼이나 우레탄폼에 비해 내화성능은 훨씬 뛰어나다. 따리서, 물리적인 성능을 고려한다면 위의 기존 단열재들을 대체할 수 있다. 섬유질 단열재는 스치로폼이나 우레탄폼에 비해 값도 싸므로 국내에서도 더욱 폭 넓게 사용하는 것이 추천된다.

난연성이 내트래킹 특성에 미치는 영향에 관한 연구 (A study on influence of flame retardant on tracking resistance)

  • 정세영;김병규;여학규;강두환
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.1
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    • pp.493-496
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    • 2003
  • Electrical characteristic of tracking resistance, volume resistance, insulation breaking strength etc. and mechanical characteristic are required to high voltage insulation insulator silicone rubber. Tracking resistance is adding much ATH to improve tracking resistance as the most important factor among them. But, there is problem that mechanical strength grows worse rapidly adding much ATH. Therefore, this research studied effect that flame retardant gets to tracking resistance during factor that influence to tracking resistance.

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고압전동기 절연진단 해석(I) (Analysis of Insulation Diagnostic Test for High Voltage Motor(I))

  • 이영준;주영호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 E
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    • pp.2104-2106
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    • 1999
  • The insulation diagnostic tests was performed at local thermal power plants high voltage motor. The insulation diagnostic tests include measurements of insulation resistance, polarization index, AC current, $tan{\delta}$, partial discharges. This paper describes the difference of insulation characteristics for high voltage motor makers.

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코밍 방열 두께 및 블레이드 방열 유무에 따른 방화 댐퍼의 내화성능에 관한 실험적 연구 (An experimental study on the fireproof performance of fire damper in accordance with insulation conditions on the coaming and blade)

  • 최태진;김정식;최경관;임영수;김유택
    • Journal of Advanced Marine Engineering and Technology
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    • 제37권4호
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    • pp.431-437
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    • 2013
  • 본 논문에서는 방화 댐퍼의 H-120 등급 방열성능 확보를 위하여 탄화수소화재 조건에 따른 내화 실험을 수행하였다. 실험체는 댐퍼 블레이드 방열 유무와 코밍 방열재 두께의 변화에 따라 3가지 타입으로 제작 하였으며, 내화실험을 통한 비 노출면 단열재와 코밍 표면 온도를 측정 하였다. 내화실험 결과 댐퍼 블레이드를 방열하지 않은 실험체-1, 2는 각각 21분, 46분경과 방열성능 허용 기준을 초과하였으며, 댐퍼 블레이드를 방열한 실험체-3은 120분 방열성능을 만족하는 것으로 나타났다. 방화 댐퍼 내화 시험 기준에 따른 비 노출면 최소 돌출길이(500 mm) 조건에서 댐퍼 블레이드 방열조건이 방화 댐퍼 내화성능에 큰 영향을 미치는 요인임을 확인할 수 있었다.

발전소 직류전선로의 지락안전진단 시스템에 관한 연구 (A Study on the Ground Fault Diagnosis System of Power Station DC Power line)

  • 안영주;김남호;이형기
    • 한국안전학회지
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    • 제12권1호
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    • pp.37-43
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    • 1997
  • There are two kinds of ground fault diagonosis system(GFD), which are for AC and DC power line. The ground fault current of a DC power line Is, first, analyzed for a description of a GFD system for DC power line and then the construction method of the GFD system, which could be processed and analyzed a ground fault current, are explained. Main functions of the system are that the detected ground fault current could be converted to the line insulation resistance by a program and saved in the system memory continuously. Finally a DC power line insulation safety could be decide by a change of the saved Insulation resistance for a given time. This system can detect the ground fault resistance to 100㏀.

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비선형모델링을 통한 온습도 바이어스 시험 중의 다층 세라믹축전기 수명 예측 (Failure Prediction of Multilayer Ceramic Capacitors (MLCCs) under Temperature-Humidity-Bias Testing Conditions Using Non-Linear Modeling)

  • 권대일
    • 마이크로전자및패키징학회지
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    • 제20권3호
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    • pp.7-10
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    • 2013
  • This study presents an approach to predict insulation resistance failure of multilayer ceramic capacitors (MLCCs) using non-linear modeling. A capacitance aging model created by non-linear modeling allowed for the prediction of insulation resistance failure. The MLCC data tested under temperature-humidity-bias testing conditions showed that a change in capacitance, when measured against a capacitance aging model, was able to provide a prediction of insulation resistance failure.

Ca 첨가에 의한 $BaTiO_3$의 환원억제기구 (The Role of Calcium as a Reduction Inhibitor in $BaTiO_3$)

  • 황연;김윤호;박순자
    • 한국세라믹학회지
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    • 제27권6호
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    • pp.741-746
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    • 1990
  • Dielectrics which do not lose their high insulation resistance in reducing atmosphere are necessary for multilayer ceramic capacitors with Ni internal electrode. In this study we investigated the Ca ion site occupancy in A-site excess Ca-doped BaTiO3 by measuring the insulation resistance, lattice constant and Curie temperature. Its Curie temperature, which was lower than that of the pure BaTiO3, was more lowered by sintering in reducing atmosphere. Lattice constnat of c-axis decreased and that of a-axis increased, suggesting substitution of Ca ions for Ti ions. Hence CaTi" acts as an acceptor to maintain high insulation resistance.ance.

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조명등기구 배선용 커넥터의 안전성 평가 및 분석에 관한 연구 (Safety Estimation and Analysis Study of the Connector for Lighting Fixture Wiring)

  • 최충석
    • 전기학회논문지P
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    • 제58권4호
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    • pp.541-545
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    • 2009
  • This study evaluated the contact resistance, insulation resistance, withstand voltage characteristics and insertion force, etc., of the wire connector used inside an integrated LITE WAY lighting fixture developed for efficient installation. Since the connector connecting the lighting fixture's internal wires is housed, it is easily connected and separated and has a structure enabling a close-fitting connection. The temperature and time applied to the high temperature characteristics test of the connector are $105^{\circ}C$ and 16 hours, respectively. The measured contact resistance of the high temperature tested connector was 3.258 mV/A, and its measured insulation resistance was greater than $10\;G{\Omega}$ All specimens demonstrated uniform insulation characteristics, which could be seen to be in good condition. From the withstand voltage test results found before and after performing the high temperature operation test on the connector for cable connection, it was confirmed that the withstand voltage characteristics between all terminals were good. The insertion force of the connector connecting the internal wiring averaged 9.67 kgf. It was observed that the insertion force between the plug housing and the female terminal, and that between the plug housing and the male terminal, were 0.680 kgf and 1.27 kgf on average, respectively.

풍속변화에 따른 순모의류의 온열특성 (The effect of air velocity on the thermal resistance of wool ensembles)

  • 송민규;전병익
    • 한국의류학회지
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    • 제22권5호
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    • pp.565-574
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    • 1998
  • The purpose of the study was to determine the effect of air velocity on the thermal resistance of wool ensembles. Three suits for men with different weaving structure and density were made with the same design and size for the study. In addition, Y-shirt, underwear, and socks were prepared for constructing the ensembles. Thermal insulation of air layer and 3 ensembles were measured by using thermal manikin in environmental chamber controlled at 2$0^{\circ}C$ and 65% RH with various air velocity. The results were as follows: 1. Thermal resistance of air layer was 0.079 m2.$^{\circ}C$/W with no air velocity(less than 0.2m/sec). 2. Thermal resistance of air layer decreased with increasing the air velocity rapidly. When the air velocity was 0.25 and 2.89 m/sec, the decreasing rate was 15% and 61%, respectively compared with no air velocity. 3. While there was little difference among the effective thermal insulation of 3 ensembles having different weaving structure and density with no air velocity, there was sharp difference among them when the air velocity increased. That is, the decreasing rate of effective thermal insulation of the ensemble which has higher air permeability was higher. 4. The decreasing rates of the effective thermal resistances of plain, twill and satin ensemble were 61, 54, and 49%, respectively when the air velocity was 2.89 m/sec which was a maximum air velocity in this study.

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A model for evaluating the fire resistance of contour-protected steel columns

  • Kodur, V.K.R.;Ghani, B.A.;Sultan, M.A.;Lie, T.T.;El-Shayeb, M.
    • Structural Engineering and Mechanics
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    • 제12권5호
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    • pp.559-572
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    • 2001
  • A numerical model, in the form of a computer program, for evaluating the fire resistance of insulated wide-flange steel columns is presented. The three stages associated with the thermal and structural analysis in the calculation of fire resistance of columns is explained. The use of the computer program for tracing the response of an insulated steel column from the initial pre-loading stage to collapse, due to fire, is demonstrated. The validity of the numerical model used in the program is established by comparing the predictions from the computer program with results from full-scale fire tests. Details of fire tests carried out on wide-flange steel columns protected with ceramic fibre insulation, together with results, are presented. The computer program can be used to evaluate the fire resistance of protected wide-flange steel columns for any value of the significant parameters, such as load, section dimensions, column length, type of insulation, and thickness of insulation without the necessity of testing.