• Title/Summary/Keyword: Peak current limiting

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Analysis on Fault Current Limiting Characteristics According to Peak Current Limiting Setting of a Flux-Lock Type SFCL with Peak Current Limiting Function (피크전류제한 설정에 따른 피크전류제한 기능을 갖는 자속구속형 초전도한류기의 고장전류제한 특성 분석)

  • Ko, Seok-Cheol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.12
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    • pp.68-73
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    • 2012
  • In this paper, the fault current limiting characteristics of a flux-lock type superconducting fault current limiter (SFCL) with peak current limiting function were analyzed through its short-circuit tests. The setting condition for the peak current limiting operation was derived from its electrical equivalent circuit, which was dependent on the inductance ratio between the third coil and the first coil. Through the analysis on the short-circuit tests for the flux-lock type SFCLs with the different inductance ratio between the third coil and the first coil, the setting value for the peak current limiting operation of the flux-lock type SFCL with peak current limiting function could be confirmed to be adjusted with the variation of the inductance ratio between the third coil and the first coil.

Analysis on Current Limiting Characteristics of a Superconducting Fault Current Limiter (SFCL) with a Peak Currnt Limiting Function (피크전류제한 기능을 갖는 초전도한류기의 전류제한 특성분석)

  • Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.24 no.1
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    • pp.47-51
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    • 2011
  • The superconducting fault current limiter (SFCL) with a peak current limiting function according to the initial fault current with the different amplitudes was suggested. The proposed SFCL, which consists of two limiting components, causes only the first superconducting element among two limiting components to be quenched in case that the initial fault current with the lower peak amplitude happens. On the other hand, the initial fault current with the higher peak amplitude makes both the superconducting elements of two limiting components to be quenched, which contributes to the peak current limiting function of the SFCL. To confirm the fault current limiting operation of the proposed SFCL, the short-circuit tests of the SFCL according to the fault angle were carried out and its effective fault current limiting operations could be discussed.

Analysis on Current Limiting Characteristics of Transformer Type SFCL with Additionally Coupled Circuit

  • Lim, Seung-Taek;Ko, Seok-Cheol;Lim, Sung-Hun
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.533-539
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    • 2018
  • In this paper, the transformer type superconducting fault current limiter (SFCL) with additionally coupled circuit was suggested and its peak fault current limiting characteristics due to the fault condition to affect the fault current were analyzed through the fault current limiting tests. The suggested transformer type SFCL is basically identical to the previous transformer type SFCL except for the additional coupled circuit. The additional coupled circuit, which consists of the magnetically coupled winding to the primary and the secondary windings together with another superconducting element and is connected in parallel with the secondary winding of the transformer type SFCL, is contributed to the peak fault current limiting operation for the larger transient fault current directly after the fault occurrence. To confirm the fault current limiting operation of the suggested SFCL, the fault current limiting tests of the suggested SFCL were performed and its effective peak fault current limiting characteristics were analyzed through the analysis on the electrical equivalent circuit.

Double Peak Current Limiting Properties of Series Connection-Type SFCL with Two Magnetic Paths (두 개의 자속경로를 갖는 직렬연결형 초전도한류기의 이중 피크전류제한 특성)

  • Ko, Seok-Cheol;Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.7
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    • pp.62-68
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    • 2014
  • We proposed a series connection-type superconducting fault current limiter(SFCL) using E-I core that can prevent the internal magnetic flux generation of cores during normal operation, and prevent the saturation of cores due to a sudden magnetic flux generation at the initial stage of fault occurrence while limiting the peak current. Through a short-circuit simulation experiment, we analyzed the operating status of the two superconducting elements and limiting characteristics according to the size of the fault current peak before and after the failure. Further, the double peak current limiting characteristics according to the winding directions as well as the current and the voltage of each coil were compared and analyzed.

Analysis on Current Limiting Characteristics According to the Influence of the Magnetic Flux for SFCL with Two Magnetic Paths

  • Ko, Seok-Cheol;Han, Tae-Hee;Lim, Sung-Hun
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.1909-1913
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    • 2014
  • In this study, a superconducting fault current limiter (SFCL) having two magnetic paths was proposed, and its current limiting characteristics were analyzed. For the SFCL to effectively perform the current limiting operation, it must be designed considering the magnetic saturation of the E-I core. Further, the influence of the magnetic flux on its peak current limiting characteristics was investigated. In addition, the magnetic flux curves of the SFCL obtained from the fault current limiting experiments were analyzed, and the subtractive polarity winding case was observed to not only further reduce the saturation potential of the core but also perform the peak current limiting functions well when compared with the additive polarity winding case.

Analysis on the Operational Characteristic between the Protective devices and Superconducting Fault Current Limiter with a Peak Current Limiting Function in the Power Distribution System (피크전류 제한 기능을 갖는 초전도한류기의 계통 적용에 따른 보호기기간 동작특성 분석)

  • Cho, Yong-Sun;Kim, Jin-Seok;Kim, Jae-Chul;Lim, Sung-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.11
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    • pp.75-80
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    • 2012
  • In this paper, the operational characteristics due to the introduction of the superconducting fault current limiter(SFCL) with a peak current limiting function were analyzed in the power distribution system. The parallel structure of the superconducting element can operate the peak current limiting function depending on the transient amplitude of fault current. We studied the operating characteristics of the introduction of the SFCL with a peak current limiting function in the power distribution system. Furthermore, we were analyzed between the SFCL with a peak current limiting function and the protection devices in the power distribution system, through the short circuit experiments.

Arc Extinguishing of a Vacuum Interrupter for an HTS First Peak Current Limiter (반주기내 한류성능을 위한 진공차단기의 아크소호)

  • Kim, W.S.;Park, C.R.;Hyun, O.B.;Kim, H.R.;Yim, S.W.;Yu, S.D.;Yang, S.E.
    • Progress in Superconductivity
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    • v.12 no.1
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    • pp.23-26
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    • 2010
  • A double line commutation (DLC) type SFCL with first peak limiting function has been proposed for ideal fault current limiting operation. Very fast switching (commutation) without any arc or high voltage problems for any kind of switching device is needed for the first peak current limiting. We've tried to find suitable conditions for a successful switching of a Vacuum Interrupter (VI) with HTS elements as a Peak Current limiting Resistance (PCR).

Study on Transient Current Limiting Operational Characteristics of Transformer Type SFCL with Two Peak Current Limiting Function (두 번의 피크전류제한 기능을 갖는 변압기형 초전도한류기의 과도전류제한 동작 특성 연구)

  • Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.8
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    • pp.499-504
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    • 2016
  • In this paper, we analyzed the operational characteristics of the fault current limiting according to the amplitude of the fault current for the transformer type superconducting fault current limiter (SFCL). If the fault current happens, the superconducting element connected to the secondary coil is occurred quench and the fault current is limited. When the larger fault current occurs, the superconducting element connected to the third coil is occurred additional quench and the peak fault current is limited. We found that the fault current can be more effectively controlled through the analysis of the fault current limiting and the short-circuit tests.

Stabilized operating condition of resistive superconducting fault current limiter using YBCO film (YBCO film을 이용한 저항형 한류기의 안정적인 동작 조건)

  • 최효상;현옥배;김혜림;황시돌;김상준
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2000.02a
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    • pp.133-135
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    • 2000
  • We fabricated resistive super- conducting fault current limiters (SFCL) based on YBCO thin films grown on a 2" diameter $Al_{2}$O_{3} substrate. The minimum quench current of the current minimum quench current of the current limiting element was about 8 $A_{peak}. This SFCL successfully controlled the fault current below 14.3 $A_{peak} at the voltage of 100$V_{rms}, which is otherwise to increase up to 141$A_{peak}. and the quench completion time is less than 3 msec. The temperature of the current limiting element rose to about 200K in 3 cycles after fault. The SFCL showed reproducible characteristics during hundreds times of repeated experiments.ents.

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Polarographic Behavior of Cadmium-Tartrate Complexes in Weak Acid and Alkaline Media

  • Lee, Kyung-Ae;Choi, Q.-Won;Ha, Young-Gu;Choy, Jin-Ho;Kim, Ha-Suck
    • Bulletin of the Korean Chemical Society
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    • v.10 no.5
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    • pp.414-418
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    • 1989
  • The electrochemical behavior of cadmium(Ⅱ) in tartrate solution has been studied over the pH range of 6 to 13.6 in order to explain the phenomena of the changes in limiting current depending on the pH. The polarographic limiting current showed a constant value up to pH of 7.8, after which it decreased sharply to show a minimum at pH between 11 and 12. The limiting current, then, increased again with increasing pH. The number of peaks in cyclic voltammogram was 1 to 3 depending on the pH of the solution. Two other voltammetric peaks could be observed when the main reduction peak diminished. The decrease of limiting current at 7.5$Cd(C_4H_3O_6)^-$. The increase of limiting current at strong alkaline solution, however, was due to the complex $Cd(Tart)_2(OH)_2^{4-}$.