• 제목/요약/키워드: High Tc Superconductivity

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고온초전도 조셉슨 접합의 고주파 검지 특성 연구 (Detectable frequency and sensitivity of high temperature superconducting Josephson junctions)

  • 조원일;심우석;유장훈;김도현;박광서;송인상
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 1999년도 High Temperature Superconductivity Vol.IX
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    • pp.38-42
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    • 1999
  • We prepared hish T$_c$ Josephson junctions that have different I$_c\;'s$ and R$_n\;'s$ and studied their microwave properties. We measured the current-voltage characteristics of the junctions under the irradiation of 22 GHz electromagnetic wave at various temperatures. from the Shapiro steps, we calculated the maximum detectable frequency and the microwave received power of the junctions. Increasing critical current values increase both maximum detectable frequency and sensitivity. However, increasing temperature increase sensitivity but decrease maximum detectable frequency.

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A study on the eddy current losses on the high-Tc superconducting power cable system

  • Song M.K.;Lee S.J.;Jang H.M.;Sim K.D.;Cho J.W.
    • 한국초전도ㆍ저온공학회논문지
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    • 제7권4호
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    • pp.32-36
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    • 2005
  • The structure of a high-Tc superconducting power cable system is composed of these parts; (from the outer section) a liquid nitrogen cryostat, a vacuum cryostat, multi-layer high-Tc superconducting cable cores and a stabilizer and both cryostats during the stable operating period of the high-Tc superconducting power cable system are calculated by the numerical method. And the optimal conditions of the stabilizer and both cryostats, that minimize the eddy current losses, are derived from the analyzed results. The optimal results can be applied to the design and manufacture of the high-Tc superconducting power cable system.

고온초전도동기모터의 교류손실에 따른 ?치 해석에 관한 연구 (A Study on the Quench characteristics Analysis considering Ac-Losses of High-Tc Superconducting Synchronous Motor)

  • 윤용수;송명곤;문창욱;홍계원;이상진;고태국
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 1999년도 제1회 학술대회논문집(KIASC 1st conference 99)
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    • pp.93-96
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    • 1999
  • This paper deals with the quench characteristic analysis in high-Tc superconducting synchronous motor of five to six hundred watts capacity. First, the magnetic field distribution and ac losses of high-Tc superconducting motor with the additive flux damper circuit was derived and computer simulation was performed with the equivalent model using FEM. The simulation results show that the quench state lasts for about 0.3 seconds.

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고온초전도동기모터의 자계분포해석에 따른 테이프선재의 안정도해석 (Srability Analysis Of High-Tc Superconducting Tape Through Magnetic Field Analysis Of The High-Tc Superconducting synchronous Motor)

  • 송명곤;윤용수;홍계원;이산진;고태국
    • 한국초전도ㆍ저온공학회논문지
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    • 제1권2호
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    • pp.25-29
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    • 1999
  • The purpose of this paper is to find the magnetic filed distribution inside the motor in order to find out if the high-Tc superconducting tapes operate stably in actual motor operation in a detailed model of the actual motor was analyzed through F.E.M.(finite Element Method). As a result, it has been proved that the high-Tc superconducting tapes can with-stand 4 A of current with staility. 4 A was the amount of current with stability. 4 A was the amount of current needed to achieve 600 A·turns which is required by the previous simulation aimed at developing this the flux damper reduces armature reactance during the motor operation. But it was observed that the flux damper generates loss by means of leakage flux and this decreases the output of the motor by about 5%.

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고온초전도 코일 제작을 위한 겁합특성 연구 (A Study on Joint Characteristics for High Tc Superconducting Coils)

  • 손명환;김석환;백승규;조영식;서무교;이언용;권영길
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.741-743
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    • 2002
  • Some different types of joining between two parallel high Tc superconducting tapes were prepared and I-V characteristic curves were obtained at the atmosphere of liquid nitrogen. Resistances in joint parts were estimated from I-V curves. We selected the best jointing method among these methods and its resistance were obtained at 28K. The availability of this joint method for fabricating HTS field coils is discussed.

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Bi계 치환 고온 초전도체 (Studies of Element Substitution on Superconductivity in Bi-Sr-Ca-Cu-O Oxides)

  • 권오흥;박천제
    • 한국항해항만학회:학술대회논문집
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    • 한국항해항만학회 2000년도 추계학술대회논문집
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    • pp.124-128
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    • 2000
  • The high Tc phase disappeared and low Tc phase increased in the substitution of transistion elements for Bi ions. The high Tc phase decreased in the substitution of Si and Sn for Bi ions. The high Tc phase increased in the substitution of Sb, As and P Which Were the same group of Bi for Bi ions. The substitution of P ions was the most effective and then the high Tc phase was formed in large quantity by replacing Bi ions with 30%of P ions.

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600kJ 전도냉각 고온초전도 SMES의 전기절연 설계 (The Electrical Insulation Design of 600kJ Conduction Cooled HTS SMES)

  • 최재형;곽동순;천현권;민치현;김해종;성기철;김상현
    • 한국초전도ㆍ저온공학회논문지
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    • 제9권3호
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    • pp.67-71
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    • 2007
  • The electrical insulation design of 600 kJ conduction cooled high-Tc superconducting magnetic energy storage (SMES) have been studied in this paper. The high voltage is applied to both ends of magnet of high-Tc SMES by quench or energy discharge. Therefore. the insulation design of the high voltage needs for commercialization. stability. reliability and so on. In this study. we analyzed the insulation composition of a high-Tc SMES. and investigated about the insulation characteristics of the materials such as Kapton. AIN. $Al_2O_3$. GFRP and vacuum in cryogenic temperature. Base on these results. the insulation design for 600 kJ conduction cooled high-Tc SMES was performed.

고온초전도동기모터의 자계분포해석에 따른 테이프선재의 안정도해석 (Stability Analysis Of High-Tc Superconducting Tape Through Magnetic Field Analysis Of The High-Tc Superconducting Synchronous Motor)

  • 송명곤;장원갑;윤용수;문창욱;홍계원;이상진;고태국
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 1999년도 제1회 학술대회논문집(KIASC 1st conference 99)
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    • pp.81-84
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    • 1999
  • The purpose of this paper is to find the magnetic field distribution inside the motor in order to find out if the high-Tc superconducting tapes operate stably in actual motor operation. With this gola, magnetic field distribution in a detailed model of the actual motor was analyzed through F.E.M. (Finite Element Method). As a result, it has been proved that the high-Tc superconducting tapes can withstand 4 A of current with stability. 4 A was the amount of current needed to achieve 600 A ·turns which is required by the previous simulation aimed at developing this motor. Also, it has been observed that the flux damper reduces armature reactance during the motor operation and during load changes, helping the stable motor operation. But, it was observed that the flux damper generates loss by means of leakage flux and this decreases the output of the motor by about 5%.

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초전도 전력 케이블에서의 stabilizer의 형태에 따른 와전류 손실 해석 (Analysis of eddy current loss in high-Tc superconducting power cables with respect to various structure of stabilizer)

  • 최석진;송명곤;이상진;심기덕;조전욱
    • Progress in Superconductivity
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    • 제7권1호
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    • pp.83-86
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    • 2005
  • The High-Tc superconducting power cable consists of a multi-layer high-Tc superconducting cable core and a stabilizer which is used to bypass the current at fault time. Eddy current loss is generated in the stabilizer in normal operating condition and affects the whole system. In this paper, the eddy current losses are analyzed with respect to various structure of stabilizer by using opera-3d. Moreover, optimal conditions of the stabilizer are derived to minimize the eddy current losses from the analyzed results. The obtained results could be applied to the design and manufacture of the high-Tc superconducting power cable system.

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고온 초전도선재를 이용한 사고 전류 제한 장치의 개념 설계 및 효용 평가 (The Conceptual Design and Estimate of Fault Current Limiter Using High-Tc superconducting Tape)

  • 이승제;이찬주;장미혜;김태중;현옥배;고태국
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 1999년도 High Temperature Superconductivity Vol.IX
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    • pp.134-137
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    • 1999
  • It is certain that the power quality will be very important at 21 century. Especially instant power shortage or power fault will occur serious problems. Accordingly stable power supplication is very technical problem. There are many way to make stable supplication as auxiliary generator, but this is long time delay complement. To solve this problem the superconducting magnetic energy storage is introduced. High Tc superconductor is more commercial.

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