• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제54권12호
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• pp.586-591
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• 2005

Magnetization loss of high temperature superconductoring BSCCO tape and YBCO coated conductor(YBCO CC) is most important issue in the development of superconducting power devices. In this paper, the measured results of magnetization losses in BSCCO tape and YBCO CC are presented and compared with each other. Measurements of magnetization losses are performed under various angles of external magnetic field to consider the anisotropic characteristics of YBCO CC. Also, we present the compared results of magnetization losses measured at arbitrary directional magnetic fields and analyzed with perpendicular magnetic field components of those. The results show that magnetization loss of YBCO CC agree well with the analyzed value by it's perpendicular magnetic field component, but BSCCO tape is not.

• 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.

• 전기학회논문지
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• 제56권2호
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• pp.282-288
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• 2007

Magnetization loss of high temperature superconductoring BSCCO tape and YBCO coated conductor(YBCOCC) is most important issue in the development of superconducting power devices. In this paper, the measured results of magnetization losses under various angles of external magnetic field in BSCCO tape stacked conductors and YBCO CC stacked conductors are presented and compared with each other. Also, we present the compared results of magnetization losses measured at arbitrary reaction magnetic fields and analyzed with perpendicular magnetic field components of those. The results show that magnetization losses of YBCO CC single and stacked conductors agree well with the analyzed value by it's perpendicular magnetic field component, but BSCCO single and stacked conductors are not.

• 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.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1249-1251
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• 2005

YBCO CC의 초전도 전력기기 응용에 대한 자화손실 저감을 위한 연구가 진행중이다. 본 논문에서는 임계상태 모델에 기초한 수치해석을 이용하여 슬릿개수의 변화에 따른 YBCO CC의 자화손실 저감 특성을 해석하였다. 수치해석을 위한 YBCO CC의 규격은 두께와 폭이 각각 $2{\mu}m$, 4mm이며 슬릿에 의한 선재분한인 필라멘트는 각각 2,4,8개이다. 또한, 수치해석의 결과는 strip모델의 자화손실식과 비교하였다. 해석 결과, 자기적으로 결합되지 않은 strip모델 해석값과 수치해석값은 차이를 보였으며 필라멘트 개수의 변화에 따라 약 1/n 수준으로 자화손실이 저감됨을 확인하였다.

• 한국초전도ㆍ저온공학회논문지
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• 제11권3호
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• pp.40-45
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• 2009

Many superconductor applications such as MRI and SMES must be operated in persistent current mode to eliminate the electrical ohmic loss. This paper presents the characteristic analysis of the high temperature superconducting (HTS) power supply made of YBCO coated conductor (CC). In this research, we have manufactured the HTS power supply to charge the 0.73 mH HTS double-pancake magnet made of YBCO CC. Among the all design parameters, the heater triggerring time and magnet applying time were the most important factors for the best performance of the HTS power supply. In this paper, three-dimensional simulation through finite element method (FEM) was used to study the heat transfer in YBCO CC and the magnetic field of the magnetic circuit. Based upon these results, the final operational sequence could be determined to generate the pumping current. In the experiment, the maximum pumping current reached about 16 A.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.832_833
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• 2009

본 연구는 과거에 개발 되었었던 보조 선로 리액터를 구비한 초전도 한류기에 대한 것이다. 과거의 연구에서는 BSCCO선재와 YBCO coated condcutor (YBCO CC) 선재를 사용하여 실험적으로 한류특성에 대하서 연구 하였다 [1]. BSCCO 선재는 유도형으로 권선되어 정상 시에 저항은 작지만 인덕턴스 성분이 존재하는 보조 선로 리액터의 역할을 수행하였고 YBCO CC 선재는 무유도형으로 권선되어 스위치의 역할을 수행하였다. 두 개의 권선은 병렬로 연결되어 정상 시에는 전류가 YBCO CC 선재로 통전되다가 사고가 발생하면 YBCO CC 선재의 저항으로 인해서 BSCCO 선재로 통전되는 형태로 동작하였다. 본 연구에서는 BSCCO 선재의 보조 선로 리액터 부분을 초전도체가 아니라 일반 상전도체를 적용하여 스위치와 보조 선로 리액터의 조합에 변화를 주면서 한류 특성에 대한 시뮬레이션을 수행하였다.

• 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.

• 한국초전도ㆍ저온공학회논문지
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• 제12권2호
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• pp.1-4
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• 2010

Normal zone propagation (NZP) within jointed YBCO coated conductors (CC) was analyzed experimentally. The joint between CC tapes were conducted by lap joint method and the characteristics of the jointed CC tapes measured from V-I curve. NZP was induced by thermal heaters attached to two points of the jointed CC tapes; the voltages across the jointed CC tapes were measured and recorded. NZP induced by each heater point is compared in point of protection of CC tapes and magnet. This study about NZP of the jointed tapes may be useful to make a magnet system with several coils using YBCO CC.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.355-356
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• 2009

In this paper, we investigated the fault current limiting characteristics according to the increase of voltage in the separates three-phase flux-lock type high-Tc superconducting fault current limiter using YBCO CC. The separated three-phase flux-lock type SFCL consists of single-phase flux-phase type SFCL in each phase. Superconductor was using the YBCO CC. To analyze the current limiting characteristics of a three-phase flux-lock type SFCL, the short circuit experiments were carded out fault such as the triple line-to-ground fault. The experimental result shows that fault current limiting characteristics was improved on the high voltage level.