• 제목/요약/키워드: YBCO coated conductor

검색결과 218건 처리시간 0.037초

스테인레스 안정화 층을 갖는 YBCO Coated Conductor의 전류 제한 특성에 관한 연구 (Study on current limiting characteristics of YBCO coated conductor with stainless steel stabilizer layer)

  • 두호익;김민주;두승규;김용진;이동혁;한병성
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 하계학술대회 논문집
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    • pp.365-366
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    • 2009
  • This study researched into the manufacture of current-limit module of using YBCO coated conductor. Regarding over-current of exceeding the critical current, the quench characteristics were researched according to the stabilizing layer through tendency in resistance, which is generated in conductor, by applying over-current to YBCO coated conductors, which have stabilizing layer. YBCO coated conductors, which were used in experiment, include one kind such as the conductor, which used stainless as the stabilizing layer. The critical current is 70 A. And, the critical temperature is with 90 K. First of all, the quench generation was researched under over-current of exceeding the critical current by using this YBCO coated conductors. The tendency of a rise in the detected voltage according to the applied current was measured. And, the tendency of a rise in resistance through voltage-current curve was measured. As a result, the point of time in thermal quench of conductor, which has stainless as the stabilizing layer, could be confirmed to be fast.

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기계적으로 분할된 YBCO 선재의 교류손실 감소에 대한 연구 (A study on the reduction of ac loss of YBCO coated conductor by a mechanical striation method)

  • 유용수;홍계원;이희균
    • 한국초전도ㆍ저온공학회논문지
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    • 제11권1호
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    • pp.9-15
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    • 2009
  • High temperature superconductor (HTS) coated conductors has high hysteretic magnetization loss which is an obstacle for the AC applications of coated conductors. We propose a method to reduce the magnetization loss of the coated conductor. It is the mechanical striation method by load variety using office knife. The magnetization loss measured in the mechanical striated YBCO coated conductor without copper layer was compared with the loss generated by perpendicularly exposed external magnetic filed. The reduction in magnetization loss due to the mechanical striation is clearly shown at higher field and was dependent on the striation number. The mechanical striation method was proven to have additional advantages of a low cost and high fabrication process.

이중 챔버를 가진 동시증발 시스템 내에서 실린더 홀더를 이용한 18cm 길이의 YBCO coated conductor의 제작 (Fabrication of a 18cm long YBCO coated conductor using a cylindrical tape holder in a double chamber co-evaporation system)

  • 오상현;정국채;염도준
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 1999년도 High Temperature Superconductivity Vol.IX
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    • pp.322-325
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    • 1999
  • We fabricated 18cm YBCO coated conductor comprising a YBCO superconducting film and CeO$_2$/YSZ/CeO$_2$ buffer films deposited on a biaxially textured Ni tape. For those film fabrications, we developed a new method, the cylindrical holder in a double chamber. This is alternative to the reel-to-reef method which is commonly tried to fabricate a long YBCO coated tape. We will discuss about the superconducting properties of the 18cm long YBCO coated tapes.

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$CeO_2$ capping layer의 증착 방법에 따른 YBCO coated conductor 특성 연구 (Study on YBCO coated conductor characteristics dependent on deposition method of $CeO_2$ capping layer)

  • 양주생;고락길;김호섭;하홍수;박유미;송규정;오상수;박찬;조월렴
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
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    • pp.268-269
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    • 2005
  • YBCO 박막형 초전도체(coated conductor) 제조를 위해서는 여러 층의 완충층이 필요하다. 현재 일반적인 완충층의 구조는 seed layer로써 $Y_2O_3$, diffusion barrier로 YSZ, capping layer로 $CeO_2$가 사용되고 있다. 특히, capping layer로 $CeO_2$는 YBCO와 lattice mismatch가 매우 우수한 산화물로 이용되고 있다 본 연구에서는 $CeO_2$ capping layer가 증착 방법에 따라 그 위에 증착되어지는 초전도층의 특성에 어떤 영향을 미치는지 연구하였다. $CeO_2$를 thermal evaporation과 PLD (pulsed laser deposition) 증착 방법으로 증착 한 후 그 위에 PLD 방법으로 YBCO를 증착하여 coated conductor의 성능을 평가하였다.

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플라즈마 표면처리를 이용한 YBCO Coated Conductor의 Ag 박막층 증착에 관한 연구 (Study on the Ag Thin Film Layer Deposition of the YBCO Coated Conductor Using a Plasma Surface Treatment)

  • 정현기;양성채;최병정;두호익
    • 한국전기전자재료학회논문지
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    • 제30권1호
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    • pp.32-36
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    • 2017
  • The Ag thin film of YBCO (yttrium barium copper oxide) CC (coated conductor) protect the YBCO layer and, at the same time, affects the electrical characteristics of the YBCO CC. Therefore, YBCO CC with the commercialization of the Ag thin film layers makes it easy to establish a process, it can lead to a variety of characteristic changes in YBCO CC. In this paper, plasma surface treatment was carried out to facilitate the deposition of the Ag thin film and the deposition process of YBCO CC. Surface roughness from the test results was increased as the time of the plasma surface treatment increased from 5 to 20 minutes. On the other hand, the surface roughness was decreased for the time of the plasma surface treatment over 20 minutes. Furthermore, after depositing, the increasing of deposit amount and reduced lifting phenomenon showed a similar tendency with the rise time of surface roughness.

구리 안정화재가 있는 YBCO 박막형 초전도 선재의 과전류 통전 특성 (Over-current characteristics of YBCO coated conductors having Cu stabilizer)

  • 임성우;두호익;김혜림;현옥배;손송호;임지현;황시돌;오성용;한병성
    • 한국초전도ㆍ저온공학회논문지
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    • 제10권1호
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    • pp.10-14
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    • 2008
  • Differently from BSCCO tapes which are fabricated by powder-in-tube method, the coated conductors are made by the evaporation of YBCO on metal substrate. Due to this structural merit, although the coated conductors are generally used for large current transportation, they are expected to be favorable to the purpose of the fault current limitation as well. In this study, using YBCO coated conductor having copper stabilizer formed by plating technique(produced by Superpower Co.), we investigated the over-current characteristics of the coated conductor. The coated conductors had 85 A $I_c$ and 90 K $T_c$. The resistance of the conductor was 0.93 $m{\Omega}/cm$ at 300 K and 0.17 $m{\Omega}/cm$ at the temperature right above $T_c$. To the coated conductors, we applied the voltages of the range from 150 $V_{rms}$ to 230 $V_{rms}$ and measured the V-I curves using four probe method. From the results, we could analyze the electric behavior of the coated conductor in flux flow state. As the current exceed $I_c$, the currents were distributed into the superconductor and metal stabilizer. The amounts of the currents shared through both current paths were calculated under the assumption that the ,Joule heating was perfectly eliminated by $LN_2$ surrounding the conductor. Finally, the condition for the stable current flowing state which does not affect the conductor was established from the analysis on the over-current characteristics.

고온초전도 마그넷 적용을 위한 YBCO Coated Conductor의 곡률 접합방법 연구 (A Study on a Splice Method of YBCO Coated Conductors with Curvature for HTS Magnet Application)

  • 김형준;조현철;장기성;양민규;안민철;고태국
    • 한국초전도ㆍ저온공학회논문지
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    • 제12권1호
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    • pp.17-21
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    • 2010
  • In the case of designing superconducting power apparatuses using the second generation high temperature superconducting wire, it is necessary to have a tape-splicing technique to achieve low splice resistance between coated conductor (CC) tapes. In this paper, an experimental splice method between YBCO CC tapes is proposed for a coil application. Splices were performed with a 37Pb-63Sn solder. YBCO samples were fabricated with various pressures and cooling rates. Joint resistances of the spliced samples of jointed YBCO CC tapes were measured and evaluated from V-I curves. In addition, optical micrographs were obtained to analyze the cross sectional microstructure of jointed samples.

Bi-2223 선재와 YBCO Coated Conductor 선재의 전송전류 손실 비교 (Transport current loss of YBCO Coated Conductor and Bi-2223 tape)

  • 임형우;이광연;차귀수;이지광;박찬
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 하계학술대회 논문집 B
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    • pp.1010-1012
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    • 2004
  • AC loss is an important factor in the development of superconducting tapes and superconducting power applications. In this paper we measured and compared characteristics of BSCCO tape and YBCO Coated Conductor(YBCO CC). BSCCO tape was fabricated by PIT method. We measured critical current density and transport current loss of it. Also, YBCO CC tape consist of substrate. buffer, YBCO and metal layers. We measured critical current density on variations of external magnetic field and transport current loss of these cases. The results of measurement show that normalized critical current of YBCO CC is smaller then that of BSCCO tape in the external magnet field. According to the results. measured loss and calculated of the YBCO CC show the same tendency.

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개선된 자속구속형 전류제한기의 동작 특성 분석

  • 김용진;두호익;김민주;이동혁;한병성
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 추계학술대회 논문집
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    • pp.215-215
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    • 2009
  • Improved flux-lock type superconducting fault current limiter(SFCL) is composed of a series transformer and superconducting unit of the YBCO coated conductor. The primary and secondary coils in the transformer were wound in series each other through an iron core and the YBCO coated conductor was connected with secondary coil in parallel. In this paper, we investigated the current limiting characteristics through initial line current after fault initiation. through the analysis, it was shown that the smaller initial line current is superior to current limiting characteristics and a point of view of power burden of the YBCO coated conductor.

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