• Title, Summary, Keyword: YBCO coated conductor

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Study on transport current properties on YBCO Coated Conductor According to aspect of type formers (Former의 형상에 따른 YBCO Coated Conductor의 사고전류 통전 특성 분석)

  • Kim, Min-Ju;Du, Ho-Ik;Doo, Seung-Gyu;Kim, Yong-Jin;Lee, Dong-Hyeok;Han, Byung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.357-358
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    • 2009
  • YBCO Coated Conductor is named by Second generation Superconductor Tapes. It is different with First generation Superconductor Tapes. YBCO Coated Tape's Specific difference with BSCCO Tape is more strong mechanical Durability. This is important role to apply to Superconducting Machines. For mechanical transforming of YBCO Coated Tapes, We are using the well designed former. The Merit of Transformation is several. First, We vary the Superconducting Characteristics according to mechanical stress. Second, We reduce the Volume of Superconductor, So We achieve reducing the volume of Superconducting Machines. On this Study, We experiment the transporting Current Characteristics of two types YBCO Coated Conductor. The one is Stainless Stabilized YBCO Conductor, and the other one is Copper Stabilized YBCO Conductor.

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Fabrication of YBCO Coated Conductor by oxide-precursor-based MOD process employing IBAD substrate (IBAD 기판을 적용한 산화물 전구체 MOD 공정에 의한 YBCO Coated Conductor의 제조)

  • Kim Y. K.;Yoo J. M.;Ko J. W.;Heo S. Y.;Hong G. W.;Lee H. G.;Chung H. S.
    • Progress in Superconductivity
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    • v.6 no.2
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    • pp.142-145
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    • 2005
  • YBCO coated conductors have been fabricated with a newly developed oxide-precursor-based MOD process. The precursor solution was synthesized with low cost YBCO powders as starting materials and YBCO coated conductors have been deposited on IBAD substrate ($CeO_2$/IBAD-YSZ/SS). YBCO coated conductor prepared by dip coating shows transport $I_c$ of 15A/cm-w at 77 K. Microstructural and crystallographic analyses indicate that YBCO layer was grown in epitaxy with substrate and exhibited well-developed dense microstructure. Also discussed are processing and analysis of YBCO coated conductor by slot-die web coating method. It was shown that this oxide-based MOD process provides a low cost route to coated conductor with high $J_c$.

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Study on Transport Current Properties on YBCO Coated Conductor according to Aspect of Spiral Former Diameter (나선형 Former의 직경에 따른 YBCO Coated Conductor의 사고전류 통전특성 분석)

  • Kim, Min-Ju;Du, Ho-Ik;Doo, Seung-Gyu;Kim, Yong-Jin;Lee, Dong-Hyeok;Han, Byung-Sung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.22 no.12
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    • pp.1067-1072
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    • 2009
  • YBCO coated conductor is named by second generation superconductor tapes. It is different with first generation superconductor tapes. YBCO coated conductor's specific difference with Bi-2223/Ag tape is more strong mechanical durability. This is important role to apply to superconducting machines. For mechanical transforming of YBCO coated conductors, we are using the well designed former. The merit of transformation is several. First, we vary the superconducting characteristics according to mechanical stress. Second, we reduce the volume of superconductor, so we achieve reducing the volume of superconducting machines. On this study, we experiment the transporting current characteristics of one types YBCO coated conductor. YBCO coated conductor with Ie of 70 A and voltage grade of 0.6 V/cm were connected to spiral former to conduct current application test.

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

  • Du, Ho-Ik;Kim, Min-Ju;Du, Seung-Gyu;Kim, Yong-Jin;Lee, Dong-Hyeok;Han, Byoung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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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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Current Limiting Characterics of YBCO Coated Conductor for SFCL According to Insulation (절연층에 따른 전류제한기용 YBCO박막형 선재의 전류제한 특성)

  • Lee, Dong-Hyeok;Du, Ho-Ik;Kim, Min-Ju;Kim, Yong-Jin;Han, Byoung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.211-211
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    • 2009
  • YBCO coated conductor can change the stabilization layer for purpose and it leads advantages in Improvement of tape's critical properties and Application. Such properties rise possibility of using YBCO coated conductor for Superconductor Fault Current Limiter, therefore, we investigate changing properties under over current condition and limiting characteristics. In this study, YBCO coated conductor's current limiting characteristic stainless steel stabilization layer under condition of changing conductor's insulating layer. Consequently, the resistance followed insulating layer so we know that limiting characteristics.

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The Study on the Current Limiting Characteristics of YBCO Coated Conductor with Different kinds of Stabilization Layer Applied to SFCL Using Iron Core and Coil (철심과 권선을 이용한 전류제한기에 적용시킨 안정화층이 다른 YBCO Coated Conductor의 전류제한 특성에 관한 연구)

  • Lee, Dong-Heok;Du, Ho-Ik;Kim, Yong-Jin;Han, Byoung-Sung;Yim, Seong-Woo;Han, Sang-Chul;Lee, Jeong-Phil
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.10
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    • pp.788-792
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    • 2010
  • The yttrium-barium-copper-oxide (YBCO) coated conductor, which supplement the fault of the existing superconducting current-limit materials YBCO thin film, bismuth-strontium-calcium-copper-oxide(BSCCO) wire and bulk, has been improved its mechanical weakness and has high index; hence, after quench YBCO coated conductor could limit the fault current effectively because of fast resistance occurrence speed. Furthermore, it has wide applicable area as an current limit material because it shows different resistance occurrence tendency by the thickness and kind of stabilization material sputtered on the superconducting layer. Therefore, many researchers are carrying out the study of application of YBCO coated conductor to superconducting fault current limiter (SFCL) for making high quality current limit element, based on resistance type. On the other hand, the study for other type except resistance type has been rarely conducted for the application of YBCO coated conductor to SFCL as an current limit element. Consequently, in this study, YBCO coated conductor with different stabilization layer Cu and Stainless steel, is applied to SFCL using iron core and coil, and examine the many index points as an current limit element, such as current limit characteristic, the tendency of resistance occurrence, response time, the temperature trend for stability.

Current Limiting Characteristics according to Applied Voltage Increase of Resistive-type SFCL using YBCO Coated Conductor (YBCO Coated Conductor를 이용한 저항형 전류제한기의 인가전압 증가에 따른 전류제한 특성)

  • Du, Ho-Ik;Kim, Min-Ju;Doo, Seung-Gyu;Kim, Yong-Jin;Lee, Dong-Hyeok;Han, Byoung-Sung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.22 no.10
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    • pp.854-859
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    • 2009
  • The YBCO coated conductor is an important element that forms the superconducting power equipment. The first advantage of applying YBCO coated conductor to superconducting power equipment is that it can effectively addresses the normal and fault currents using less quantity of wire than when using Bi tape due to its high critical current density. Second, it can limit the fault current fast because its index value is high. so that the resistance can be produced fast when it is applied to the superconducting current limiting element. Third, the type of stabilization layer that surrounds the YBCO superconductor is selectable and the magnitude of the resistance that is produced from quenching can be adjusted. This study researched into the manufacture of current-limiting element of using YBCO coated conductor, into the characteristics of current limiter that considered by combining the manufactured element with the resistive-type superconducting fault current limiter.

The effect of deposition temperature/pressure on the superconducting properties of YBCO coated conductor (YBCO coated conductor의 초전도 특성에 미치는 박막 증착 온도/압력의 영향)

  • Park, Chan;Ko, Rok-Kil;Chung, Jun-Ki;Choi, Soo-Jeong;Song, Kyu-Jeong;Park, Yu-Mi;Shin, Ki-Chul;Shi, Dongqi;Yoo, Sang-Im
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.30-33
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    • 2003
  • YBCO coated conductor, also called the 2nd generation high temperature superconducting wire, consists of oxide multi-layer hetero-epitaxial thin films. Pulsed laser deposition (PLD) is one of many film deposition methods used to make coated conductor, and is the one known to be the best to make superconducting layer so far. As a part of the effort to make long length coated conductor, the optimum deposition condition of YBCO film on single crystal substrate (SrTiO3) was investigated using PLD. Substrate temperature, oxygen partial pressure, and laser fluence were varied to find the best combination to grow high quality YBCO film.

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Fabrication of YBCO coated conductor using oxide precursor-based MOD processing (산화물 전구체 MOD공정에 의한 YBCO coated conductor제조)

  • Kim Young Kuk;Yoo Jai Moo;Ko Jae Woong;Chung Kuk Chae;Kim Young Jun;Han Bong Soo
    • Progress in Superconductivity and Cryogenics
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    • v.7 no.1
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    • pp.5-8
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    • 2005
  • MOD Process using metal acetates or trifluoroacetates has been considered to be a strong candidate for a low cost fabrication process for coated conductor with high $J_e$. Recently, an economical MOI) process has been developed for coated conductor with high $J_c$ using low cost starting materials such as YBCO powders. YBCO thin films prepared by single coating on LAO substrate with this modified oxide-precursor solution gives transport $I_c$ of 100A/cm-w and the $J_c$ value of $2.9MA/cm^{2}$ (77K, Self-field). The YBCO coated conductor prepared by single coating with $CeO_2/IBAD-YSZ/SS$ tape gives transport $I_c$ of 50A/cm-w in 2cm. Characterization with XRD, SEM shows that the YBCO layers were epitaxially grown and exhibit well-developed dense micro-structures. This newly developed oxide-precursor based MOD process will provide a low cost route to coated conductor with high $J_c$.

Effect of Transport Current Properties on Connecting of YBCO Coated Conductor having Stabilizer Layer and BSCCO Tape (안정화 층을 갖는 YBCO Coated Conductor와 BSCCO 선재의 결합이 과전류 통전 특성에 미치는 영향)

  • Du, Ho-Ik;Kim, Min-Ju;Park, Chung-Ryul;Doo, Seung-Gyu;Kim, Yong-Jin;Han, Byoung-Sung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.10
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    • pp.950-953
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    • 2008
  • YBCO coated conductor called the second-generation superconducting tapes have resistance increase significantly more than BSCCO tapes in terms of the speed or amount when quench occurs, they may have different ranges of application. Such characteristics are thought to get different properties by selection of stabilizing materials in manufacturing superconducting tapes. It is important in selecting superconducting tapes which will be applied to power devices in the future. In this study, one kind of BSCCO tapes and two kinds of YBCO CC with different stabilizing materials and one kind of YBCO CC with non stabilizing materials were used to compare and examine transport characteristics in flux-flow state and quench state with each tape joint of HTS tapes.