• 제목/요약/키워드: parallel connection

검색결과 357건 처리시간 0.037초

2차권선의 병렬연결에 따른 하이브리드형 초전도 한류기의 특성 (Characteristics of Hybrid-Type SFCL according to the Parallel Connection of Secondary Windings)

  • 황종선;조용선;최효상
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2006년도 학술대회 논문집 전문대학교육위원
    • /
    • pp.208-211
    • /
    • 2006
  • We have analyzed operating characteristics of hybrid-type superconducting fault current limiter (SFCL) according to the parallel connection of secondary windings with $YBa_{2}Cu_{3}O_{7}$ (YBCO) films. The turn ratio between the primary and secondary windings of each reactor was 63:21. Hybrid-type SFCL using a transformer with parallel reactors could reduce the unbalanced quench caused by differences of the critical current density between YBCO films. We found that hybrid-type SFCL having parallel connection induced simultaneous quench between the superconducting elements. The quench-starting point at this time was almost same. When the applied voltage was 200V, the limiting current in the hybrid-type SFCL with a serial connection was lowered to 34 percent than that in the SFCL with a parallel connection. In the meantime, when the voltage generated in the superconducting elements was the same, the current value in the parallel connection was 60 percent less than in the serial connection. The voltage generated in the primary winding also showed the similar behavior. In conclusion, we found that the fault current was limited more effectively in the SFCL with the serial connection but the power burden of the superconducting elements was reduced in the parallel connection.

  • PDF

직·병렬연결시 리액터를 이용한 초전도 소자의 퀜치 특성 (Quench Characteristics of Superconducting Elements using Reactors at Series and Parallel Connections)

  • 최효상;임성훈;조용선;남긍현;이나영;박형민
    • 한국전기전자재료학회논문지
    • /
    • 제18권9호
    • /
    • pp.863-869
    • /
    • 2005
  • We investigated quench characteristics of superconducting elements connected in series and parallel each other. The serial and parallel connections of superconducting elements causes a difficulty in simultaneous quench due to slight difference between their critical current densities. In other to induce simultaneous quench, we fabricated four type circuits; serially connected circuit before parallel connection, the circuit connected in parallel before serial connection, serially connected circuit before parallel connection with reactors, the circuit connected in Parallel before serial connection with reactors. We confirmed that the simultaneous quenches occurred in serial and parallel connections of superconducting elements using reactors. In addition, the power burden of superconducting elements was smaller than those of serial and parallel connections of superconducting elements without reactors.

2차 권선의 연결방법에 따른 변압기형 초전도 한류기의 특성 (Characteristics of Transformer-Type SFCL according to the Connecting Methods of Secondary Coils)

  • 조용선;박형민;정수복;최효상
    • 전기학회논문지
    • /
    • 제56권12호
    • /
    • pp.2078-2083
    • /
    • 2007
  • We have analyzed operating characteristics of transformer-type superconducting fault current limiter (SFCL) according to the serial or parallel connections of secondary coils with $YBa_2Cu_3O_7$ (YBCO) thin films. The turn ratio between the primary and secondary coils was 63:21. Transformer-type SFCL using a transformer with secondary winding of serial or parallel coils could reduce the unbalanced quench caused by differences of the critical current density between YBCO thin films. We found that transformer-type SFCL having serial or parallel connections induced simultaneous quench between the superconducting units. The limiting current in the transformer-type SFCL with a parallel connection was lowered to 30 % compared to the SFCL with a serial connection. In the meantime, when the currents generated in the superconducting units were similar, the voltage value in the parallel connection was 60 % as low as that in the serial connection. However, the voltage generated in the primary winding was some higher. In conclusion, we found that transformer-type SFCL with parallel connection of secondary coils was more effective in fault current limiting characteristics and in the reduction of the consumption power for superconducting units compared to those of the transformer-type SFCL with serial connection of secondary coils.

전기용량 국가표준 소급범위 확장을 위한 직/병렬 연결구조의 전기용량 표준기 개발 (Development of Standard Capacitors with Serial/Parallel Connection Structure for Expanding National Standard Traceability of Capacitance Standard Field)

  • 김한준;강전홍;한상옥
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
    • /
    • 제55권8호
    • /
    • pp.403-407
    • /
    • 2006
  • Standard capacitors, as like as Hamon resistor standards, of series connection/parallel connection ratio $10{\mu}F/1000{\mu}F\;and\;100{\mu}F/10000{\mu}F$ were fabricated for calibration of impedance bridges or analyzers with measuring ranges up to 1 F. The calculated correction terms to the ratio of one measured value in series connection to the value in parallel connection were evaluated to be $1.92{\times}10^{-7}$. These capacitors were designed to be used not only as 100:1 capacitance standards but also as single capacitors or decade capacitors with decade values at frequencies up to 1 kHz.

염료감응형 태양전지의 병렬 연결에서 발생하는 전류 손실 분석 (The Analysis of the Current Loss in the Parallel Connection of Dye-sensitized Solar Cells)

  • 서현웅;이경준;손민규;홍지태;김희제
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2008년도 춘계학술대회 논문집
    • /
    • pp.412-415
    • /
    • 2008
  • In a research on the practical dye-sensitized solar cell, a study on a large module have preference because module must be able to generate the proper current that is possible to convert electrically. So the parallel connection of dye-sensitized solar cells which outputs a large current easily is essential. However, there is a current loss in a paralle connection of dye-sensitized solar cells and the loss becomes larger according to increasing the number of parallel connection. In this study, we analyzed the cause of the current loss in the parallel connection by using the equivalent circuit analysis. One DSC used in this experiment had an active area $8cm^2$(4.62cm$\times$1.73cm) and it attained a conversion efficiency of 5.43% under 1 sun illumination ($P_{in}$ of 100 mW/$cm^2$) using a solar simulator.

  • PDF

YBCO소자의 연결방법에 의한 자속구속형 초전도 한류기의 퀜치특성의 향상 (Improvement of Quench Properties of a Flux-Lock Type Superconducting Fault Current Limiter by the Connection Method of YBCO Elements)

  • 정수복;박형민;최효상
    • 전기학회논문지P
    • /
    • 제57권3호
    • /
    • pp.323-327
    • /
    • 2008
  • We investigated the quench characteristics of a flux-lock type superconducting fault current limiter (SFCL) depending on the methods of the serial and parallel connections between the superconducting elements. The flux-lock type SFCL consists of two coils. The primary coil is wound in parallel to the secondary coil through an iron core, and the secondary coil is connected to the superconducting elements in series and parallel. In this paper, the analyses of voltage, current, and resistance of the superconducting elements connected in serial and parallel were performed to increase the power capacity of the flux-lock type SFCL. A part of the superconducting elements was not quenched in $2{\times}2$ serial connection between the elements and then the power burden of the quenched elements was increased. However the elements with $2{\times}2$ parallel connection was all quenched. This means that the power burden of each superconducting element can be reduced under the same conditions. We found that $2{\times}2$ parallel connection was more profitable for the current limiting effects and the increase of the power capacity.

병렬 연결된 전송선로를 이용한 비대칭 전력 분배기 (Unequal Power Divider using Parallel Connection Transmission Line)

  • 권상근;김영;윤영철
    • 한국항행학회논문지
    • /
    • 제17권2호
    • /
    • pp.202-207
    • /
    • 2013
  • 본 논문에서는 병렬 연결된 전송선로를 이용하여 고 비율 비대칭 전력 분배기를 설계하였다. 병렬 연결된 전송선로는 마이크로스트립 기술로 구현하기 어려운 낮은 임피던스의 전송선로를 높은 임피던스 전송선로로 구현하는 방법이다. 비율 비대칭 분배기 구현 시 사용되는 낮은 임피던스를 구현하기 위하여 병렬 연결된 전송선로를 이용함으로서 구현을 쉽게 할 수 있었다. 이러한 설계방법의 타당성을 보이기 위해서 중심 주파수 1 GHz에서 10:1 비율의 비대칭 전력 분배기를 제작하였고, 이것의 특성은 시뮬레이션과 거의 동일함을 확인하였다.

초전도 한류소자의 병렬연결에 따른 자속구속형 초전도 한류기의 특성 분석 (Characteristics of a Flux-Lock Type Superconducting Fault Current Limiter According to the Parallel Connection of the Superconducting Elements.)

  • 오금곤;정병익;최효상
    • 전기학회논문지P
    • /
    • 제57권2호
    • /
    • pp.198-201
    • /
    • 2008
  • We investigated the operating characteristics of the flux-lock type superconducting fault current limiter(SFCL) with the parallel connection between the primary and secondary windings which are connected with two superconducting units in series. The parallel connection for current level increase of the flux-lock type SFCL is necessary to apply the SFCL into the power system. The resistance generated in superconducting units was dependent upon the winding direction of the primary and the secondary coils, which can reduce the power burden. The resistance of the superconducting elements in the subtractive polarity winding is higher than that of the additive polarity winding. The fault current limiting effect of the subtractive polarity winding is better than that of the additive polarity winding. From this results, we confirmed that the power capacity of the flux-lock type SFCL could be increased by the parallel connection of the superconducting units.

CNT와 Pt 상대전극을 가지는 염료감응형 태양전지의 직렬 ${\cdot}$ 병렬 연결에 따른 특성비교 (Comparative properties for serial-parallel connection of DSC with CNT and pt counter electrodes)

  • 최진영;홍지태;김미정;이용철;김희제
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2007년도 춘계학술대회
    • /
    • pp.335-338
    • /
    • 2007
  • Cost effectiveness is an important parameter for producing DSSCs as compared to the widely used conventional silicon based solar cells. A fluorine-doped tin oxide (FTO) substrate coated with a catalytic amount of platinum is used as counter electrode in dye-sensitized solar cell. Carbonaceous materials are quite attractive to replace platinum due to their high electronic conductivity, corrosion resistance towards $I_{2}$, good catalytic effect and low cost. In this paper, the unit DSSCs with Pt and CNT as a counter electrode were connected in series-parallel externally, then the current-voltage curves were investigated to find out the connection characteristics of the DSSC with CNT counter electrode. The connection characteristics of the DSSC with CNT counter electrode is superior to that of the DSSC with Pt counter electrode. And a parallel connection of the DSSC with CNT counter electrode has higher efficiency than a series connection of that.

  • PDF