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YBCO Coated Conductor를 이용한 저항형 전류제한기의 인가전압 증가에 따른 전류제한 특성
두호익,김민주,두승규,김용진,이동혁,한병성,Du, Ho-Ik,Kim, Min-Ju,Doo, Seung-Gyu,Kim, Yong-Jin,Lee, Dong-Hyeok,Han, Byoung-Sung 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.10
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.
Resistance Increase Behavior of HTS Wire with Stabilizer Layer on Applied Over-currents
두호익,한병성,김민주,두승규,김용진 한국전기전자재료학회 2009 Transactions on Electrical and Electronic Material Vol.10 No.2
YBCO-coated conductors, called “second-generation wires,” show a remarkably greater increase in the amount or speed of their resistance than BSCCO wires when a quench occurs. This is probably because of the specific resistance at their stabilizer layer, which also affects their voltage grade. YBCO coated conductors with copper as a stabilizer layer have a voltage grade of 1.5-2 V/cm, and those with stainless steel as a stabilizer layer have a voltage grade of about 0.5-0.6 V/cm. The voltage grade of YBCO coated conductors is important in selecting and applying superconducting wires to power instruments later. In this study, two kinds of YBCO-coated conductors with different stabilizer layers and one kind of BSCCO wire were prepared. Among them, based on the YBCO coated conductors that had a stainless steel stabilizer layer with a low voltage grade, five kinds of experimental samples for joining were prepared with the remaining two kinds of wires. Using the prepared samples, the current application properties and the resistance increase in the flux-flow and the quench states of the single wire and the joined wires were compared.
Fault Angle Dependent Resistance of YBCO Coated Conductor with Stainless Steel Stabilizer Layer
두호익,한병성,김민주,두승규,김용진 한국전기전자재료학회 2009 Transactions on Electrical and Electronic Material Vol.10 No.2
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 °, 45 °, and 90 °. 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.
Deposition of Thin Metal Films in Via Holes of LSI by Using the IBE Method
두호익,양성채 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.2
The characteristics of an ablation plasma generated by using an intense, pulsed ion beam werestudied experimentally by using high-speed photography and calorimetry. From the high-speedphotographs, it is found that the ablation plasma were found to expand toward the substrate, andit is kept for about 20 μs after the start of the beam irradiation. The calorimetry diagnostic resultsshould that the thermal energy carried by the ablation plasma instantly, a increased the substratesurface temperature to over 900 K. After that, thermal conduction in the substrate dominated andthe temperature dropped at a rate of 108 K/s. Using the high-density ablation plasmas producedby pulsed ion beam interaction with solid targets, we successfully embedded tungsten thin films invia holes with an aspect ratio of 4.3, not only in the bottom of the silicon, but also in the side walls.
안정화 층을 갖는 YBCO Coated Conductor와 BSCCO 선재의 결합이 과전류 통전 특성에 미치는 영향
두호익,김민주,박충렬,두승규,김용진,한병성,Du, Ho-Ik,Kim, Min-Ju,Park, Chung-Ryul,Doo, Seung-Gyu,Kim, Yong-Jin,Han, Byoung-Sung 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.10
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.
개선된 자속구속형의 2차 측 권선 방향과 1차 권선수와 2차 권선수의 변화에 따른 사고전류제한 특성
김용진,두호익,이동혁,한병성,Kim, Yong-Jin,Du, Ho-Ik,Lee, Dong-Hyeok,Han, Byoung-Sung 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.9
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.
Study on Current Limiting Characteristics of YBCO Thin- Film Wire with Insulation Layer
두승규,두호익,전안균 한국전기전자재료학회 2013 Transactions on Electrical and Electronic Material Vol.14 No.1
When applying superconducting wire to power machines, an investigation needs to be carried out on the characteristics of wire phase changes in connection with the insulating layer. This study examined trends in the increase of the wire’s resistance and the characteristics of its recovery from quenching by a current-applied cycle at temperatures of 90 K, 180 K, and 250 K. The procedure was conducted based on the thickness and presence (or absence) of the insulating wire layers. To achieve this, YBCO thin-film wires with the same critical temperatures were prepared with copper and stainless steel stabilizing layers. At levels (-one, three, and five-), with superior performance, polyimide pressure-sensitive adhesive tape was attached to the wires at a very low temperature. The eight prepared test samples were wound around the linear frames. The wire’s voltage and current created from the phase change characteristics were measured at the wire’s prescribed temperature, using the four-point probe method. The wire’s resistance and recovery characteristics were examined for each cycle at temperatures of 90 K, 180 K, and 250 K.
2세대 초전도 선 안정화 층 구조변화가 비저항 특성에 미치는 영향
반상재,두호익,정현기,두승규,양성채 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.2
The quench voltage of the second-generation superconducting wire is affected by the resistivity characteristics of the stabilization layer. The specific resistance of the stabilization layer can be changed by the deposition process using RF magnetron sputtering. In this paper, a thin film made of a homogeneous material (Ag) and a dissimilar material (Cu) was deposited on the stabilization layer of the second-generation superconducting wire through RF magnetron sputtering. We found that the specific resistance was reduced by increasing the thickness of the stabilization layer. The reduction in the resistivity of the stabilization layer led to a decrease in the quench voltage of the second-generation superconducting wire. We suggest that various characteristic changes of the second-generation superconducting wire can be expected through the successful change in the resistivity of the stabilization layer of the proposed deposition process.
철심과 권선을 이용한 전류제한기에 적용시킨 안정화층이 다른 YBCO Coated Conductor의 전류제한 특성에 관한 연구
이동혁,두호익,김용진,한병성,임성우,한상철,이정필,Lee, Dong-Heok,Du, Ho-Ik,Kim, Yong-Jin,Han, Byoung-Sung,Yim, Seong-Woo,Han, Sang-Chul,Lee, Jeong-Phil 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
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.