• Title/Summary/Keyword: HTSC element

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Analysis of Magnetic Field Application Effect on Fault Current Limiting Characteristics of a Flux-lock Type SFCL

  • Lim, Sung-Hun
    • Transactions on Electrical and Electronic Materials
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    • v.9 no.6
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    • pp.255-259
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    • 2008
  • The magnetic field application effect on resistance of a high-$T_c$ superconducting (HTSC) element comprising a flux-lock type superconducting fault current limiter (SFCL) was investigated. The YBCO thin film, which was etched into a meander line using a lithography, was used as a current limiting element of the flux-lock type SFCL. To increase the magnetic field applied into HTSC element, the capacitor was connected in series with a solenoid-type magnetic field coil installed in the third winding of the flux-lock type SFCL. There was no magnetic field application effect on the resistance of HTSC element despite the application of larger magnetic field into the HTSC element when a fault happened. The resistance of HTSC element, on the contrary, started to decrease at the point of four periods from a fault instant although the amplitude of the applied magnetic field increased.

Quench Characteristics of Flux-lock Type SFCL in Subtractive Polarity Winding (감극 결선시 자속구속형 전류제한기의 퀜치 특성)

  • Hwang, Jong-Sun;Han, Tae-Hee;Choi, Hyo-Sang;Park, Hyoung-Min;Cho, Yong-Sun;Nam, Guong-Hyun;Lee, Na-Young;Lim, Sung-Hun;Chung, Dong-Chul;Han, Byoung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.251-252
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    • 2006
  • As one of methods to increase the voltage rating of the flux-lock type SFCL, the fault current limiting characteristics of the flux-lock type SFCL with HTSC elements connected in series were analyzed. The initial fault current amplitudes in two SFCLs with the series connection of two HTSC elements and with single HTSC element were the same. In addition, the resistance amplitude of each HTSC element in SFCL with the series connection of two HTSC elements had the similar one in SFCL with single HTSC element. With increase of applying voltage, the unbalance of voltage between two HTSC elements in SFCL with the series connection of two HTSC elements disappeared.

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Fault Current Limiting Characteristic of Flux-Lock Type HTSC Fault Current Limiter (자속구속형 고온초전도 전류제한기 사고전류제한 특성)

  • Lim, Sung-Hun;Choi, Myung-Ho;Park, Bok-Kee;Song, Jee-Joo;Park, Dae-Hee;Han, Byoung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.08a
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    • pp.105-108
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    • 2002
  • In this paper, we investigated the fault current limiting characteristic of flux-lock type High-Tc superconducting fault current limiter(HTSC-FCL), which is comprised of a flux-lock reactor and an external magnetic field coil covering the HTSC element In this HTSC-FCL, the initial limiting current level can be controlled by adjusting the inductance of the each coil. Furthermore, the fault current limiting characteristics of HTSC-FCL can be improved by applying 'the external magnetic field into the HTSC element We performed the computer simulation by numerical analysis about the flux-lock type HTSC-FCL and compared the results of experiment with simulation ones. We can obtain the same results from both the computer simulation and the experiment except for the time immediately after fault occurs.

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Operational Characteristics of Flux-lock Type SFCL using Series Resonance

  • Lim, Sung-Hun;Han, Byoung-Sung;Choi, Hyo-Sang
    • Transactions on Electrical and Electronic Materials
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    • v.6 no.4
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    • pp.159-163
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    • 2005
  • We analyzed the fault current limiting characteristics of a flux-lock type $high-T_c$ super­conducting fault current limiter (HTSC-FCL) using series resonance between capacitor for series resonance and magnetic field coil which was installed in coil 3. The capacitor for the series resonance in the flux-lock type HTSC-FCL was inserted in series with the magnetic field coil to apply enough magnetic field into HTSC element, which resulted in higher resistance of HTSC element. However, the impedance of the flux lock type HTSC-FCL has started to decrease since the current of coil 3 exceeded one of coil 2 after a fault accident. The decrease in the impedance of the FCL causes the line current to increase and, if continues, the capacitor for the series resonance to be destructed. To avoid this operation, the flux-lock type HTSC-FCL requires an additional device such as fault current interrupter or control circuit for magnetic field. From the experimental results, we investigated the parameter range where the operation as mentioned above for the designed flux-lock type HTSC-FCL using series resonance occurred.

Operational Characteristics of SFCL using Magnetic Coupling of Coils (코일의 자기결합을 이용한 초전도 사고전류제한기의 동작특성)

  • Lim, Sung-Hun;Kim, Jae-Chul
    • Proceedings of the KIEE Conference
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    • 2007.04c
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    • pp.68-70
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    • 2007
  • The operational characteristics of superconducting fault current limiter (SFCL) using magnetic coupling of coils were investigated. This SFCL consists of a high-Tc superconducting (HTSC) element and two coils with series or parallel connection on the same iron. This SFCL has the merit that the operational current of SFCL can be increased higher than the critical current of the superconducting element by adjusting the inductance ratio between two coils. To confirm its operation, the circuit for the fault simulation was constructed. From the measured voltage and current of the SFCL, it was confirmed that the resistance of HTSC element comprising this SFCL increased more than that of HTSC element's independent operation.

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Current Limiting and Recovery Characteristics of Two Magnetically Coupled Type SFCL with Two Coils Connected in Parallel Using Dual Iron Cores (이중철심을 이용한 병렬연결된 자기결합형 초전도한류기의 전류제한 및 회복특성)

  • Ko, Seok-Cheol;Lim, Sung-Hun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.5
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    • pp.717-722
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    • 2016
  • In this paper, in order to support the peak current limiting function depending on the intensity of the fault current at the early stage of failure, a two magnetically coupled type superconducting fault current limiter (SFCL) is proposed, which includes high-Tc superconducting (HTSC) element 1, where the existing primary and secondary coils are connected to one iron core in parallel, and HTSC element 2, which is connected to the tertiary winding using an additional iron core. The results of the experiments in this study confirmed that the two magnetic coupling type SFCL having coil 1 and coil 2 connected in parallel using dual iron cores is capable of having only HTSC element 1 support the burden of the peak current when a failure occurs. The reason for this is that although HTSC element 1 was quenched and malfunctioned because the instantaneous factor of the initial fault current was large, the current flowing to coil 3 did not exceed the critical current, which would otherwise cause HTSC element 2 to be quenched and not function. In order to limit the peak current upon fault through the sequential HTSC elements, the design should allow it to have the same value as the low value of coil 1 while having coil 3 possess a higher self-inductance value than coil 2. In addition, a short-circuit simulation experiment was conducted to examine and validate the current limiting and recovery characteristics of the SFCL when the winding ratio between coil 1 and coil 2 was 0.25. Through the analysis of the short-circuit tests, the current limiting and recovery characteristics in the case of the additive polarity winding was confirmed to be superior to that of the subtractive polarity winding.

Comparative Study of Current Limiting Characteristics for Hybrid Type and Flux-Lock Type SFCLs

  • Lim, Sung-Hun
    • Transactions on Electrical and Electronic Materials
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    • v.8 no.5
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    • pp.222-225
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    • 2007
  • In this paper, we compared the current limiting characteristics of both the hybrid type and the flux-lock type superconducting fault current limiters(SFCLs), which have a magnetic coupling structure between a primary winding and several secondary windings. The limiting impedances of two SFCLs were derived from each equivalent circuit considering the design parameters of SFCL such as the self-inductance of secondary winding and the resistance of $high-T_C$ superconducting(HTSC) element. Through the comparison for the limiting impedances of two SFCLs considering the dependence of the HTSC element's resistance on the applying voltage into the SFCL, the hybrid type SFCL was confirmed to have larger limiting impedance with smaller resistance of HTSC element than the flux-lock type SFCL. It was expected from the analysis that the hybrid type SFCL was more advantageous than the flux-lock type SFCL from the viewpoint of the fault current limiting level.

Analysis on Power Consumption and Accumulated Energy According to Resistance of Superconducting Element and Winding Current of Transformer Type SFCL Using Double Quench (이중 ?치를 이용한 변압기형 초전도 한류기의 권선전류와 초전도소자 저항에 따른 전력소모 및 누적에너지 분석)

  • Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.10
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    • pp.630-634
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    • 2016
  • In this paper, we analyzed the power consumption and the accumulated energy in HTSC (high-TC superconducting elements) according to the resistance of HTSC element and the winding current of transformer type SFCL (superconducting fault current limiter) using double quench. For the analysis, two different inductances of the one secondary winding among two secondary windings comprising the transformer type SFCL were selected and the short-circuit tests were carried out. The consumed power and the accumulated energy in HTSC element connected into the secondary winding with larger inductance were analyzed to be larger compared to the one connected into the secondary winding with lower inductance.

Increase of Operational Current in a SFCL using Series or Parallel Coupling of Coils (코일의 직.병렬결합을 이용한 초전도 사고전류제한기의 동작전류 증가)

  • Lim, Sung-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.10
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    • pp.46-51
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    • 2007
  • The fault current limiting characteristics of superconducting fault current limiter(SFCL) using magnetic coupling of two coils were investigated. This SFCL consists of a high-TC superconducting(HTSC) element and two coils with series or parallel connection on the same iron. In normal time, the inner magnetic fluxes generated by two coils are canceled in case that the HTSC element keeps superconducting state. However, in case that the resistance of the HTSC element happens by a short-circuit the magnetic fluxes, not cancelled, induce the voltages across two coils and the fault current can be limited by the impedance of this SFCL. This SFCL has the merit that the operational current of SFCL can be increased higher than the critical current of the superconducting element by adjusting the inductance ratio between two coils. To confirm its operation, the circuit for the fault simulation was constructed. From the measured voltage and current of the SFCL, it was confirmed that the operating current of this SFCL increased more than that of HTSC element's independent operation.

Comparative Analysis on Magnetization Characteristics and Stored Energy of Magnetically Coupled SFCLs Using Single and Double HTSC Elements (단일·이중소자를 이용한 자기결합 초전도 한류기의 자화특성 및 누적에너지 비교분석)

  • Choi, Sang-Jae;Kim, Bo-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.2
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    • pp.101-105
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    • 2017
  • In this paper, the magnetization characteristics and the stored energy of magnetically coupled superconducting fault current limiter (SFCL)s using single and double high-Tc superconducting (HTSC) elements were compared. To analyze the magnetization characteristics and the stored energy, the magnetizing current and the flux linkage, which were derived from the electrical equivalent circuit of the SFCL using single and double HTSC elements, were calculated from the voltages and the current measured in the short-circuit tests. Through the comparative analysis on the magnetization characteristics and the stored energy for SFCL using sing and double HTSC elements, the magnetically coupled SFCL using double HTSC elements was shown to be more effective than the SFCL using single HTSC element from the point of view of the magnetic saturation.