• Title, Summary, Keyword: Insulation barrier

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Mechanical Fracture Characteristic of Epoxy Insulation Barrier for High Voltage GIS (초고압 GIS용 에폭시 절연물 배리어 파단 특성)

  • Suh, Wang Byuck
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.10
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    • pp.641-645
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    • 2017
  • In this study, an epoxy insulation barrier for high voltage GIS was developed using epoxy and a filler with a Young's modulus of 11 GPa. The material was investigated using a simulation of the principal stress, displacement, and safety factors while optimizing the profile shape. The simulation showed that thelarger Young's modulus of the $Al_2O_3$ filler compared to the $SiO_2$ in the epoxy insulation can contribute to an increase in resistance to mechanical fracturing for theoptimized profile barrier in high voltage GIS. In addition, the safety factor was improved by 10%. It can be concluded that the mechanical fracturing properties of the insulation barrier can be enhanced by increasing the content of the elastic filler, $Al_2O_3$, for high voltage GIS applications.

The Effect of Metallic Barrier on the Surface creeping Flash-over Voltage along the Insulation Materials (절연물의 연면섬락 전압에 미치는 금속 격벽의 영향)

  • Sung Kae Chung
    • 전기의세계
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    • v.14 no.2
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    • pp.8-13
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    • 1965
  • It is expected that the impurities contained in a solid state insulation material will affect a considerable influence on its break-down voltage, dielectric loss, and insulation resistance. In this thesis, as a preliminary experimental research for the investigation described above, the effect of metalic barrier between the electrodes on the creepin flash over discharge voltage along the surface of a solid insulation material has been investigated, and got some interesting results. It was found that generaly the flash over voltage rises when a metalic barrier is located between the electrodes. The results of this investigation will be taken into account as an important components on the insulation design to prevent the creeping flash over discharge in insulators, bushings, and so on.

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An Experimental Study of the Dried and Unified Execution Technology for the Sub-Organization of the Green Roofs System using the Panel of Block Type (블록형 패널을 이용한 옥상녹화 하부시스템의 건식화 $\cdot$ 일체화 시공기술에 대한 실험적 연구)

  • Moon, You-Seok;Jang, Sang-Muk;Hong, chae-ho;Cha, Yun-Jung;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.119-123
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    • 2007
  • Recently, the green roofs market is active, but most constructors use former waterproofing method. So there are a lot of problems in the sub-organization of the green roofs system. I studied to use the block panel for the sub-organization of the green roofs system and I tested about the effectiveness of waterproofing, root barrier, drainage, and insulation. I have not found any problems about waterproofing, root barrier, drainage, and insulation in the results. The sub-organization of the green roofs system using the block panel is effective for waterproofing, root barrier, drainage, and insulation. We can apply it to the dried and unified execution technology.

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A Study on Life Cycle Cost Analysis of Thermal Bridge Barrier Between Window Frame and Concrete Wall (건축물의 창틀과 벽체 사이 열교방지공법의 LCC 분석)

  • Park, Cheol-Yong;Kim, Woong-Hoi;Lee, Sang-Hee;Nam, Seung-Young;Yoon, Gil-Ho
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.59-60
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    • 2019
  • Thermal bridge on a building envelope causes additional heat loss which increases the heating energy consumption. As the higher building insulation performance is required, heat loss through thermal bridge becomes higher proportion among total building heating energy consumption. For the exterior insulation and finish system, thermal bridge between window frame and concrete wall should be constidered as one of main reasons of heat loss. In this study, the thermal bridge barrier between window frame and concrete wall(STAR) was proposed as the best practice for reducing thermal bridge. The STAR was confirmed that the use of thermal bridge barrier imporved the annual heat energy capacity by 35% or more and the innitial construction cost by 7.4% or less because of additional interior insulation against condensation. Finally the life cycle cost during 20 year by heating energy of a building reduced by 25% or more compared with the exist technology. This STAR thermal bridge barrier will be used as the main technology to improve the energy efficiency of building.

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A Study on Electrical and Mechanical Properties of Epoxy Insulation Barrier for High Voltage GIS Using a Filler of SiO2 and Al2O3 (SiO2와 Al2O3를 충진재료로 사용하는 초고압 GIS용 에폭시 절연물 베리어의 전기적 및 기계적 특성에 관한 연구)

  • Suh, Wang-Byuck;Bae, Dong-Ho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.6
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    • pp.379-383
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    • 2015
  • Some insulating materials are organized and analyzed with variables to obtain the optimized profile of encapsulated three phase of epoxy barrier which is applied to gas compartment and supporting conductors for high voltage GIS (gas insulated switchgear). The high voltage GIS is used in electrical power system and operating reliability. In this paper, optimization possibility of barrier shape including both electrical insulation performance and mechanical strength, premised on that condition minimizing volume and light weight should be kept for high voltage GIS, could be achieved by analysis simulation. As a result, filling material which is lower permittivity such as $SiO_2$ instead of $Al_2O_3$ properly to the epoxy material, can be improved to increase the electrical insulation performance and mechanical strength for an optimized profile barrier of a high voltage GIS.

Current Voltage Characteristic of ZTO Thin Film by Negative Resistance (ZTO 박막의 부성저항에 의한 전류전압특성)

  • Oh, Teresa
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.2
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    • pp.29-31
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    • 2019
  • The ZTO/p-Si thin film was produced and investigated for tunneling phenomena caused by the interface characteristics of the depletion layer. ZTO thin film was deposited and heat treated to produce barrier potentials by the depletion layer. The negative resistance characteristics were shown in the thin film of ZTO heat treated at $100^{\circ}C$, and the insulation properties were the best. Current decreased in the negative voltage direction by nonlinear show key characteristics, and current decreased in tunneling phenomenon by negative resistance in the positive voltage direction. Heat treated at $100^{\circ}C$, the ZTO thin film has increased barrier potential in the areas of the depletion layer and therefore the current has increased rapidly. The current has decreased again as we go beyond the depletion layer. Therefore, tunneling can be seen to make insulation better. In the ZTO thin film heat treated at $70^{\circ}C$ without tunneling, leakage current occurred as current increased at positive voltage. Therefore, tunneling effects by negative resistance were found to enhance insulation properties electrically.

Cryogenic Insulation Technique for HTS Transformer (고온초전도 변압기용 극저온 절연기술)

  • Kim, Sang-Hyun;Cheon, Hyeon-Gweon
    • Progress in Superconductivity and Cryogenics
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    • v.8 no.1
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    • pp.45-48
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    • 2006
  • In the response to the demand for electrical energy , much effort was given to develop and commercialize high temperature superconducting (HTS) power equipments has been made around the world. Especially, HTS transformer is one of the most promising devices . but the cryogenic insulation technology should be established during development Hence many types of dielectric tests should be carried out to understand the dielectric phenomena at cryogenic temperature and to gather various dielectric data. Among the many types dielectric tests . the characteristic of barrier effect were conducted using simulated electrode after analysing the insulating configuration of HTS transformer main winding. The influence of a barrier on the dielectric strength was measured according to the position of the harriet the number of the barrier and thickness or the barrier. It was shown that the effectiveness . namely the ratio of the breakdown voltage in presence of barrier to the voltage without barrier, is highest when the barrier is placed at the needle electrode side. On the contrary, in the case of having the barrier between the electrodes, the harrier was placed between the electrodes the characteristic was even improved slightly.

Development on Thermal Bridge Barrier Between Window Frame and Wall (건축물의 창틀과 벽체 사이 열교 차단을 위한 단열공법 개발)

  • Park, Cheol-Yong;Kim, Woong-Hoi;Lee, Sang-Hee
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.10-11
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    • 2018
  • Internal Insulation system is applied to the most apartment building in Korea. However due to the importance of building energy enhanced the interest of the exernal insulation system. The extermal insulation system has better thermal performance because the thermal bridge through the structure are rarely formed. But the thermal bridge around the window decrease the thermal performance of the envelope system. Therefore the technology for reducing the thermal bridge around window improves energy efficiency of the building. In order to this it is necessary to minimize the thermal bridge around window of building. In this study it is aimed to minimize the thermal bridge around the window of building. It was confirmed that the use of thermal bridge barrier imporved the heat transfer rate by 64% or more and the condensation reduction phenomenon by 42% or more compared with the exist technology. These thermal bridge barrier will be used as the main technology to improve the energy efficiency of building.

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LIQUID FLOW AND EVAPORATION SIMULATION OF CRYOGENIC FLUID IN THE WALL OF CRYOGENIC FLUID CARGO CONTAINMENT SYSTEM (극저온 유체 화물창 방벽 내의 액체유동 및 기화 시뮬레이션)

  • Park, Bum-Jin;Lee, Hee-Bum;Rhee, Shin-Hyung;Bae, Jun-Hong;Lee, Kyung-Won;Jeong, Wang-Jo;An, Sang-Jun
    • Journal of computational fluids engineering
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    • v.14 no.2
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    • pp.9-18
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    • 2009
  • The cargo containment system (CCS) for ships carrying cryogenic fluid consists of at least two levels of barriers and insulation layers. It is because, even though there is a small amount of leak through the primary barrier, the liquid tight secondary barrier blocks further leakage of the cryogenic fluid. However, once the secondary barrier is damaged, it is highly possible that the leaked cryogenic fluid flows through the flat joint made of glass wool and reaches the inner hull of the ship. The primary objective of the present study is to investigate the influence of the damage extent in the secondary barrier on the amount of leaked cryogenic fluid reaching the inner hull and the temperature distribution there. Simulation results using a computational fluid dynamics tool were compared with the experimental data for the leaked cryogenic fluid flow and evaporation in the secondary insulation layer. The experimental and computational results suggest that, unless there is a massive leak, the cryogenic fluid mostly evaporates in the insulation layer and does not reach the inner hull in the state of liquid.

Evaluation of sound insulation performance according to aperture conditions under the flush door (세대내 플러시 도어의 하부틈새 조건에 따른 차음성능 평가)

  • An, Ji-Hyeong;Kim, Myung-Jun;Lee, Min-Joo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.153-158
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    • 2007
  • Sound insulation performance of the flush door in the apartment unit was recently decreased due to the door for the purpose of barrier free. To evaluate sound insulation, the test for 13 kinds of flush doors was performed as aperture conditions under the flush door. and the measured value was compared with the predicted values of theoretical sound transmission. The results were summarized follow; First, in case of doors with aperture by barrier free, the single number quantities ($D_{pw}$) were evaluated $21{\sim}23dB$. Whereas, in case of existing door with frame, $D_{pw}$ was evaluated $28{\sim}31dB$. And in case of sealed doors, $D_{pw}$ was evaluated $31{\sim}34dB$. Second, the measured $D_{pw}$ was good agreement with the predicted $D_{pw}$ in condition of small aperture.

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