• Title/Summary/Keyword: YBCO coated conductor

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The Magnetization Losses Characteristics of Multi-stacked and Variable Angle of External Magnet Field in YBCO CC and BSCCO tape (YBCO Coated Conducor와 BSCCO tape의 적층 및 외부자장의 각도에 따른 자화손실 특성)

  • Lim, Hyoung-Woo;Lee, Hee-Joon;Cha, Guee-Soo
    • Progress in Superconductivity and Cryogenics
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    • v.7 no.3
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    • pp.34-38
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    • 2005
  • Multi-stacked HTS tapes are needed to conduct large current in the power application. In this paper, magnetization losses of the multi-stacked YBCO coated conductor and the BSCCO tape have been measured and compared. Magnetization losses of single tape, 2-stacked, 3-stacked and 4-stacked HTS tapes have been presented in this paper. Multi-stacked tapes have been fabricated using face-to-face type stacking method. Measurements of magnetization loss were performed under various angle of external magnetic field to consider the anisotropic characteristics of HTS tapes. Test results show that loss density per unit volume decreased for both YBCO coated conductors and BSCCO tapes when the stacking number of tapes is increased. The magnetization losses of YBCO CC are larger than those of BSCCO tapes when the external magnetic field is increased.

Batch-type fabrication process of YBCO coated conductor using oxide-precursor-based MOD method (산화물 전구체 기반의 MOD방법을 이용한 YBCO 고온초전도 선재의 batch-type 제조 공정)

  • Chung Kook-chae;Yoo Jai-moo;Ko Jae-Woong;Kim Young-Kuk
    • Progress in Superconductivity and Cryogenics
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    • v.7 no.3
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    • pp.9-12
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    • 2005
  • [ $Y_1Ba_2Cu_3O_{7-8}$ ] (YBCO) coated conductor has been fabricated by batch-type process using oxide-precursor-based metal-organic deposition (MOD) method. The batch-type process can be scaled up more simply to Produce long-length YBCO conductor than the reel-to-reel process. Also, it has less handling problems and is adequate to the ambient gas environment. In this work, YBCO oride powder was used as a starting precursor for MOD method. After reel-to-reel dip coating process, me ter-long-buffered metal tape was wound around a cylinder and underwent calcination and annealing processes. Annealed YBCO films showed good c-axis alignment and dense surface morphology with no cracks, but exhibited very low critical current density of $10^5\;A/cm^2$.

A study on the bonding properties of YBCO coated conductors with stainless steel stabilizer (스테인레스 강 안정화 YBCO 초전도선재의 접합 특성에 관한 연구)

  • Kim, Tae-Hyung;Oh, Sang-Soo;Song, Kyu-Jeong;Kim, Ho-Sup;Ko, Rock-Kil;Shin, Hyung-Seop
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.262-263
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    • 2005
  • For mechanical and electrical stability and environment protection, Cu and stainless steel stabilizer is laminated to Ag layer to produce a composite neutral-axis(N-A) architecture in which the YBCO layer is centered between the oxide buffered metallic substrate and stabilizer strip lamination. this architecture allows the wire to meet operational requirements including stresses at cryogenic temperature, winding tensions, mechanical bending requirements thermal and electrical stability under fault conditions. we have experimentally studied mechanical properties of laminated stainless steel stabilizer on YBCO coated conductors. we have laminated YBCO coated conductors by continuous dipping soldering process. we have investigated lamination interface between solder and stabilizer, YBCO coated conductor. we evaluated bonding properties tensile / shear bonding strength, peeling strength laminated YBCO coated conductors.

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A study on the bonding properties of YBCO coated conductors with stabilizer tape (안정화 선재의 YBCO 초전도 접합 특성)

  • Kim Tae-Hyung;Oh Sang-Soo;Ha Dong-Woo;Kim Ho-Sup;Ko Rock-Kil;Shin Hyung-Seop;Park Kyung-Chae
    • Progress in Superconductivity and Cryogenics
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    • v.8 no.3
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    • pp.23-26
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    • 2006
  • For mechanical and electrical stability and environment protection. Cu and stainless steel stabilizers are laminated to a Ag layer to produce a composite neutral-axis(N-A) architecture in which the YBCO layer is centered between the oxide buffered metallic substrate and stabilizer strip lamination. This architecture allows the wire to meet operational requirements including stresses at cryogenic temperature. winding tensions as well as mechanical bending requirements including thermal and electrical stability under fault current conditions. We have experimentally studied mechanical properties of the laminated stainless steel and Cu stabilizers on YBCO coated conductors. We have laminated YBCO coated conductors by continuous dipping soldering process. We have investigated lamination interface between solder and stabilizer of the YBCO coated conductor. We evaluated bonding properties. tensile / shear bonding strength. and peeling strength laminated YBCO coated conductors.

Effect of solvent on YBCO coated conductor prepared by MOD-TFA method (MOD-TFA방법으로 YBCO coated conductor 제조 시 용매의 영향)

  • 허순영;유재무;고재웅;김영국
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.10a
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    • pp.87-89
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    • 2003
  • YBa$_2$Cu$_3$$O_{7-x}$ thin films were fabricated by MOD-TFA process via dipping method on LaAlO$_3$(LAO) single crystalline substrates. In this study, we investigated effect of solvent on the microstructure and crystallinity of YBCO thin films. The YBCO films derived from solvent with low boiling point has good surface morphologies.s.

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Current Limiting Characteristics of Improved Flux-Lock Type SFCL According to Winding Direction of Coil 2 and Variable Number of Coil 1 and Coil 2 (개선된 자속구속형의 2차 측 권선 방향과 1차 권선수와 2차 권선수의 변화에 따른 사고전류제한 특성)

  • Kim, Yong-Jin;Du, Ho-Ik;Lee, Dong-Hyeok;Han, Byoung-Sung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.9
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    • pp.714-717
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    • 2010
  • The improved flux-lock type superconducting fault current limiter (SFCL) is composed of a series transformer and superconducting unit of the yttrium-barium-copper-oxide (YBCO) coated conductor. In this paper, we investigated current limiting characteristics through winding direction of coil 2 and variable number of coil 1 and coil 2 in improved flux-lock type SFCL. The better fault current characteristics and the burden of YBCO coated conductor can be confirmed from the experimental result in the higher turn ratio of coil 1 and coil 2 in the additive conditions. In case of subtractive condition, we can confirm a similar result in the same case of experimental conditions. but the burden of YBCO coated conductor has been increased from an increase in winding numbers of coil 2.

Current Limiting Characteristics of Separated Three-phase Flux-coupling Type SFCL according to Winding Number of Coil 2 and Winding Direction (삼상 분리형 자속커플링 전류제한기의 2차 권선의 턴 수 및 결선 방향에 따른 전류제한 특성)

  • Kim, Yong-Jin;Du, Ho-Ik;Doo, Seung-Gyu;Kim, Min-Ju;Lee, Dong-Hyeok;Han, Byoung-Sung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.22 no.8
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    • pp.694-697
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    • 2009
  • The separated three-phase flux-coupling 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 winding number of coil 2 and winding direction in the flux-coupling type SFCL. Through the analysis, it was shown that additive polarity condition and lower winding number of coil 2 have advantaged from the point of view of fault current limiting and burned of YBCO coated conductor.

Fabrication of coated conductor by continuous PVD methods (연속 공정 PVD 방법에 의한 coated conductor 제조)

  • Ko, Rock-Kil;Chung, Jun-Ki;Kim, Ho-Sup;Ha, Hong-Soo;Shi, Dongqi;Park, Yu-Mi;Choe, Su-Jeong;Song, Kyu-Jeong;Yoo, Sang-Im;Moon, Seung-Hyun;Park, Chan
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07a
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    • pp.93-96
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    • 2004
  • 다층의 산화물 박막 구조를 갖는 coated conductor의 장선 제조를 위해서는 연속 증착 공정이 필요하다. 본 연구에서는 RABiTs와 IBAD 공정을 사용한 texture template을 사용하였으며, 금속 테잎을 연속적으로 이동하면서 증착할 수 있는 박막증착 장치(PLD, sputtering, evaporation)를 구축하여 PVD 방법으로 coated conductor를 제조하였다. $CeO_2/YSZ/Y_2O_3$의 완충층을 sputtering 과 evaporation을 이용하여 2축배향성을 가지는 NiW 위에 연속적으로 증착하였다. YBCO 초전도층은 연속 PLD 방법으로 증착하고, Tc, Ic, XRD, SEM을 통해 그 특성을 분석하였다. 그 결과 RABiTS template을 사용하여 Ic가 34A/cm(@77K)인 0.4m 길이의 coated conductor를 제조하였다. IBAD template를 사용하여 Ic가 34A/cm(@77K)인 0.5m길이의 coated conductor를 제조하였고, Jc는 $1.2MA/cm^2$ 이였다.

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Fault Angle Dependent Resistance of YBCO Coated Conductor with Stainless Steel Stabilizer Layer

  • Du, Ho-Ik;Kim, Min-Ju;Doo, Seung-Gyu;Kim, Yong-Jin;Han, Byoung-Sung
    • Transactions on Electrical and Electronic Materials
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    • v.10 no.2
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    • pp.66-69
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    • 2009
  • To manufacture YBCO-coated conductors as superconducting fault current limiters, it is important to conduct researches on their durability. To test their durability, it is necessary to investigate their properties before and after the quench in more severe conditions than in general operating conditions. In this study, their voltage-current and resistance properties were measured before and after a fault current was repetitively applied to them. For the applied voltage, the voltage grades of the YBCO coated conductors were considered. The current amplitude was controlled using protective resistance on an experimental track, and the time and number of applications were fixed to produce the quench occurrence at the fault angles of $0^{\circ}$, $45^{\circ}$, and $90^{\circ}$. The operating conditions of the YBCO coated conductors as the main components of superconducting fault current limiters were determined using their voltage properties. The voltage properties of the YBCO coated conductors that were analyzed in this research will be used as important data for their practical application to superconducting fault current limiters.