• 제목/요약/키워드: HTS(high temperature superconductor)

검색결과 178건 처리시간 0.026초

?칭 특성을 고려한 EMTDC 저항형 초전도 한류기 모텔링 (Modeling of the HTS Fault Current Limiter Considering Quenching Characteristic)

  • 윤재영;김종율;이승렬
    • 대한전기학회논문지:시스템및제어부문D
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    • 제53권2호
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    • pp.73-73
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    • 2004
  • Nowadays, one of the serious problems in KEPCO system is the larger fault current than the SCC(Short Circuit Capacity) of circuit breaker. There are many alternatives to reduce the increased fault current such as isolations of bus ties, enhancement of SCC of circuit breaker, applications of HVDC-BTB(Back to Back) and FCL(fault current limiter). However, these alternatives have some drawbacks in viewpoints of system stability and cost. As the superconductivity technology has been developed, the HTS-FCL(High Temperature Superconductor-Fault Current Limiter) can be one of the attractive alternatives to solve the fault current problem. Under this background, this paper presents the EMTDC model for resistive type HTS-FCL considering the nonlinear characteristic of final resistance value when quenching Phenomena occur.

고온 초전도 SMES용 전도냉각시스템 특성시험 (Test of the Conduction Cooling System for HTS SMES)

  • 염한길
    • 한국초전도ㆍ저온공학회논문지
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    • 제10권1호
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    • pp.62-66
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    • 2008
  • The characteristic of the superconducting magnetic energy storage(SMES) system is faster response, longer life time, more economical, and environment friendly than other uninterruptible power supply(UPS) using battery. So, the SMES system can be used to develop methods for improving power quality where a short interruption of power could lead to a long and costly shutdown. Recently, cryogen free SMES has developed using BSCCO(Bismuth Strontium Calcium Copper Oxide) wire. We fabricated and tested the conduction cooling system for the 600 kJ class HTS SMES. The experiment was accomplished for the simulation coils. The simulation coils were made of aluminium, it is equivalent to thermal mass of 600 kJ HTS SMES coil. The coil is cooled with two GM coolers through the copper conduction bar. In this paper, we report that the test results of cool-down and heat loads characteristics of the simulation coils. The developed conduction cooling system adapted to 600 kJ HTS SMES system and cope with the unexpected sudden heat impact, too.

22.9kV 고온 초전도 케이블.초전도 한류기 스마트 그리드 적용을 위한 초전도 시범사업 (Introduction of The First Demonstration Project for the Application of HTS Cable and SFCL to Real Smart Grid in South Korea)

  • 양병모;박진우;이승렬
    • 한국초전도ㆍ저온공학회논문지
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    • 제12권3호
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    • pp.34-38
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    • 2010
  • Until now some countries including South Korea have made big progress and many efforts in the development of high temperature superconductor (HTS) power equipments. Especially, HTS Cable and superconducting fault current limiter (SFCL) are the strongest candidates among them from the viewpoint of applying to real grid. In South Korea, HTS cable and SFCL have been installed in test fields and tested successfully at Gochang PT Center of KEPCO. In order to meet practical requirements and be feasible in real grid, a demonstration project for HTS cable and SFCL systems, called GENI(green superconducting electric power network at Icheon substation) project, has been initiated to install 23kV HTS cable and SFCL systems in a utility network in South Korea since 2008. Namely, it says the first demonstration project for the application HTS system to real smart grid in South Korea. This paper presents the design and the application plan of the 22.9kV HTS cable and SFCL in 154kV Icheon substation in South Korea with the viewpoint of applying in Smat Grid.

No-insulation 기법을 적용한 소용량 고온 초전도 코일의 영구전류 특성에 관한 연구 (A Study on the Basic Characteristics of Persistent Current Mode Operation for Small Scale High Temperature Superconducting Coil with No-insulation Winding Method)

  • 이태성;이우승;최석진;조현철;김형준;이지호;강재식;권오준;이해근;고태국
    • 한국초전도ㆍ저온공학회논문지
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    • 제14권3호
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    • pp.23-27
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    • 2012
  • This paper aims to evaluate the feasibility of using no-insulation High Temperature Superconducting (HTS) coil in persistent current mode system. A HTS coil in persistent current mode system usually includes one or more non-superconducting joints in its circuit. And the current decaying rate of the coil is affected by the resistance of joint in persistent current circuit. If the resistance of joint is large, decaying rate of the current drastically increases. Therefore, reducing the joint resistance of the HTS coil is very important in persistent current mode system. In this paper, the no-insulation HTS coil is suggested as a way to reduce the joint resistance with the embedded parallel contact resistance naturally made by no-insulation winding method. Two small coils are fabricated with insulation and no-insulation winding method, and persistent current mode system experiment of each coil is preformed and analyzed.

YBCO CC을 사용한 초전도전원장치의 요소특성 해석 (Characteristic analysis of components of a high temperature superconducting power supply using YBCO coated conductor)

  • 윤용수;조대호;박동근;양성은;김호민;정윤도;배덕권;고태국
    • 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.

안정화 층을 갖는 YBCO Coated Conductor와 BSCCO 선재의 결합이 과전류 통전 특성에 미치는 영향 (Effect of transport current properties on connecting of YBCO Coated Conductor having stabilizer layer and BSCCO tape)

  • 김민주;두호익;임성우;박충렬;최병환;두승규;김용진;한병성
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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    • pp.290-291
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    • 2008
  • Recently High Temperature Superconductor(HTS) Tape is limelight of the applied superconducting machines. Mainly used superconducting tape are BSCCO tape and YBCO coated tape. These superconducting tape are applied such as SMES, superconducting generator and MAGLEV. Actually superconductor tape's experimental gauge is short. For this reason, experiment was conducted. Firstly length of 50cm BSCCO, YBCO Coated conductor@Cu and YBCO coated conductor@sus are prepared. and flow the over-current. Secondly, BSCCO and Coated conductor connected with lenth of 25cm and flow the over-current. Coupled line of HTS tape was compared with single line of HTS tape and these overcurrent characteristics was investigated.

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Voltage disturbance detection method for HTS tape using electromagnetically coupled coils

  • Song, Seunghyun;Lee, Jiho;Lee, Woo Seung;Jin, Hongwoo;Hwang, Young Jin;Ko, Tae Kuk
    • 한국초전도ㆍ저온공학회논문지
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    • 제16권1호
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    • pp.23-26
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    • 2014
  • This paper represents the detection method of voltage disturbance for high temperature superconducting (HTS) tape using electromagnetically coupled coils. In order to detect the voltage as the superconductor transits from the superconducting state to the normal conduction state, voltage taps are widely used to get the voltage signal. And voltage taps are connected to data acquisition device via signal wires. However this new suggested method can detect the superconducting transition voltage without signal wires between voltage taps and data acquisition device by using electromagnetically coupled coils. This system consists of two electromagnetically coupled coils, the first coil to detect and transmit the voltage of HTS tape and the second coil to pick up the transmitted voltage from the first coil. By using this new suggested method, we can build the 'separated voltage-detection system'. HTS tape and first coil are located under liquid nitrogen vessel and the second coil is located under room temperature condition. In this paper, experiments are performed to verify the feasibility of the proposed method. As the result of the experiment, the separated voltage-detection system using electromagnetically coupled coils can successfully observe superconducting-normal transition of HTS tapes.

전도냉각형 펠티어 전류도입선의 최적화 (Optimization of Conduction-cooled Pottier Current Leads)

  • 정은수
    • 설비공학논문집
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    • 제17권8호
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    • pp.764-771
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    • 2005
  • A theoretical investigation for optimization of conduction-cooled Peltier current leads is undertaken. A Pottier current lead (PCL) is composed of a thermoelectric element (TE), a metallic lead and a high Tc superconductor (HTS) lead in the order of decreasing thermoelectric tempera ture. Mathematical expression for the minimum heat flow per unit current crossing the TE metal interface and that flowing from the metal lead to the joint of the metal and the HTS leads are obtained. It is shown that the temperature at the TE-metal interface possesses a unique optimal value that minimizes the heat flow to the joint and that this optimal value depends on the material properties of the 73 and the metallic lead but not the joint temperature nor electric current. It is also shown that there exists a unique optimal value for the joint temperature between the metal and the HTS leads that minimizes the sum of the power dissipated by ohmic heating in current leads and the refrigerator power consumed to cool the lead, for a given length of the HTS.

고온초전도 더블 팬케이크 코일들 사이의 접합 방법 (A Joining Method between HTS Double Pancake Coils)

  • 손명환;심기덕;김석호;김해종;배준한;이언용;민치현;성기철
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제55권12호
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    • pp.633-639
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    • 2006
  • High temperature superconductor (HTS) winding coil is one of the key component in superconducting device fabrication. Double-pancake style coils are widely used for such application. High resistance between pancake coils greatly affects the machine design, operating condition and thus the stability. In order to reduce such resistance, experimentalists are looking for efficient and damage free coil connecting methods. In this respect, here we proposed parallel joining method to connect the coils. This is to do crossly joining with HTS tapes on two parallel HTS tapes. Joint samples between two parallel HTS tapes were prepared by using HTS tapes and current-voltage (I-V) characteristic curves were investigated at liquid nitrogen temperature i.e., 77.3 K. A 20 cm length joint connected between two parallel HTS tapes shows $32.5n{\Omega}$, for currents up to 250 A. A small HTS magnet, having two double pancake sub-coils connected together through new parallel joint method was fabricated and their current-voltage (I-V) characteristic curve was investigated. At 77.3K, critical current(Ic) of 97 A and resistance of $55n{\Omega}$ for currents upto 130 A were measured. At operating current 86 A lower than Ic, Joule heats generated in whole magnet and at joint region between sub-coils were 226 mW and 0.4 mW, respectively. Low Joule heat generation suggests that this joining method may be used to fabricate HTS magnet or windings.

적층 배열형상에 따른 BSCCO 적층선재의 자화손실 특성 수치해석 및 측정 (Numerical Analysis and Measurement of Magnetization Loss in BSCCO Multi-stacked Conductor According to Stacking Geometry)

  • 박명진;임형우;이광연;차귀수;이지광
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제55권2호
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    • pp.83-88
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    • 2006
  • AC loss is one of the main research area in AC power application using high temperature superconductor(HTS), such as HTS transformer, HTS current limiter and HTS cable, because it is closely related to efficiency, economic estimation and design of power device. A lot of research for various arrangements of HTS tapes have been performed to increase a capacity of transport current because single HTS tape can not satisfy the demanded current capacity in HTS power application. In this paper, we studied magnetization loss by different several arrangements of BSCCO tapes such as Edge-to-Edge type, Face-to-Face type and Matrix type through numerical analysis by 2D-FEM and measurement. As a result, we got the result that the magnetization loss of Face-to-Face type arrangements was lower than those of other arrangement types under the conditions of the same stacking number. We think that the result was due to shield effect by demagnetization of adjacent HTS tapes which are located face to face.