• Title/Summary/Keyword: Current limiting

Search Result 741, Processing Time 0.038 seconds

Analysis on Current Limiting Characteristics of the SFCL with Magnetically Coupled Two Coils and YBCO Coated Conductor Due to the Winding Direction and the Turn Number' Ratio Between Two Coils (직렬 연결된 두 코일과 YBCO Coated Conductor로 구성된 초전도 전류제한기의 권선방향과 권선 비에 따른 전류제한 특성 분석)

  • Lee, Dong-Hyeok;Du, Ho-Ik;Kim, Yong-Jin;Han, Byoung-Sung;Han, Sang-Chul;Lee, Jeong-Phil
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.24 no.1
    • /
    • pp.52-56
    • /
    • 2011
  • The ongoing Superconducting Fault Current Limiter(SFCL) development mainly has focused on the application of commercializaton and power system through combining with normal-conducting device, moving away from current-limiting method, which is solely dependant on the existing superconductor. Compared to the structural development above, on the other hand, the research on applying superconducting current-limiting element to SFCL, the heart of SFCL, still has a lot left to do, apart form traditional resistive type SFCL. In this study, we looked into the current limiting characteristic of SFCL using core and coil. YBCO coated conductor with stainless steel stabilizer layer was verified by the excellent of current-limiting element of the resistive type SFCL that has a high Jc and index as well as being superior in mechanical property. Also, we study temperature characteristics and resistance characteristics, max voltage, response time and current-limiting ability that can be an indicator as current-limiting element while applying to superconducting current-limiting element caused by variation of winding direction, winding ratio of SFCL using core and coil.

Evaluation on the Properties of the Current Limiting Part for Fault-Current-Limiting Type HTS Cables (사고전류 제한형 고온 초전도케이블의 한류부 특성평가)

  • Kim, Tae-Min;Hong, Gong-Hyun;Han, Byung-Sung;Du, Ho-Ik
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.28 no.3
    • /
    • pp.191-195
    • /
    • 2015
  • Inside the existing superconducting cables, the superconducting wire carries a loss-free current, and the cable former (the stranded copper wire) bypasses the fault current to prevent damage and loss of the superconducting cable when the fault current is applied. The fault-current-limiting-type superconducting cable proposed in this paper usually carries a steady current; but in a fault state, the cable generates self-resistance that makes the fault current lower than a certain width. That is, the superconducting cable that transmitted only a low voltage and a large capacity power repetitively limits the fault current, as does a superconducting current limiter. To complete this structure, it is essential to investigate the mutual resistance relationship between the superconducting wires after applying a fault current. Therefore, in this paper, one kinds of superconducting wires (a wire without a stabilization layer) were connected parallel 4 tapes, respectively; and after applying a fault current, the current, voltage, resistance and thermal stability of the HTS thin-film wires were examined.

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
    • /
    • v.29 no.8
    • /
    • pp.499-504
    • /
    • 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.

Analysis on Simulation and Experiment for Fault Current Limiting Characteristics of SFCL using Magnetic Coupling of Two Coils with Series Connection (직렬연결된 두 코일의 자기결합을 이용한 초전도 전류제한기의 사고전류제한 특성 시뮬레이션 및 실험 분석)

  • Kim, Jae-Chul;Lim, Sung-Hun;Kim, Jin-Seok;An, Jae-Min;Moon, Jong-Fil
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.22 no.8
    • /
    • pp.26-30
    • /
    • 2008
  • The simulation and experiment for the fault current limiting characteristics of the superconducting fault current limiter (SFCL) using the magnetic coupling of series connected two coils were performed. The magnetic fluxes generated from two coils were canceled out during a normal time. However, the resistance generation of high-Tc superconducting (HTSC) element after a fault occurrence allows the magnetic fluxes of two coils and contributes to the fault current limiting operation. Through the computer simulation and the current limiting experiment for this SFCL, the operational current and the limiting impedance of the SFCL could be confirmed to be improved by adjusting the inductance ratio of two coils.

Analysis on Fault Current Limiting Characteristics of Three-Phase Transformer Type SFCL using Double Quench According to Three-Phase Ground-Fault Types (이중퀜치를 이용한 삼상변압기형 초전도한류기의 삼상지락 고장 종류에 따른 고장전류 제한 특성 분석)

  • Shin-Won Lee;Tae-Hee Han;Sung-Hun Lim
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.36 no.6
    • /
    • pp.614-619
    • /
    • 2023
  • The fault current limiting characteristics of three-phase transformer type superconducting fault current limiter (SFCL), which consisted of three-phase primary and secondary windings wound on E-I iron core, one high-TC superconducting (HTSC) element connected with the secondary winding of one phase and another HTSC element connected in parallel with other two secondary windings of two phases, were analyzed. Unlike other three-phase transformer type SFCLs with three HTSC elements, three-phase transformer type SFCL using double quench has the merit to perform fault current limiting operation for three-phase ground faults with two HTSC elements. To verify its proper three-phase ground fault current limiting operation, three-phase ground faults such as single-line ground, double-line ground and triple-line ground faults were generated in three-phase simulated power system installed with three-phase transformer type SFCL using double quench. From analysis of its fault current limiting characteristics based on tested results, three-phase transformer type SFCL using double quench was shown to be effectively operated for all three-phase ground faults.

Computer Simulation Analysis on Fault Current Limiting Characteristics of SFCL using Magnetic Coupling of Two Coils with Series Connection (직렬연결된 두 코일의 자기결합을 이용한 초전도 사고전류제한기의 사고전류제한 특성 컴퓨터 시뮬레이션 분석)

  • Lim, Sung-Hun;An, Jae-Min;Kim, Jin-Seok;Moon, Jong-Fil;Kim, Jae-Chul
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 2007.11a
    • /
    • pp.213-216
    • /
    • 2007
  • The computer simulation for the fault current limiting characteristics of the superconducting fault current limiter (SFCL) using the magnetic coupling of two coils was performed. The magnetic fluxes generated from two coils were canceled out during a normal time. However, the resistance generation of high-$T_c$ superconducting (HTSC) element after a fault occurrence keeps up the magnetic fluxes of two coils and contributes to the fault current limiting operation. Through the computer simulation for the fault current limiting characteristics based on its electrical equivalent circuit, its operational current and the limiting impedance could be improved by adjusting the inductance ratio between two coils.

  • PDF

Fault Current Limiting Characteristics of Separated and Integrated Three-Phase Flux-Lock Type SFCLs

  • Lim, Sung-Hun
    • Journal of Electrical Engineering and Technology
    • /
    • v.2 no.3
    • /
    • pp.289-293
    • /
    • 2007
  • The fault current limiting characteristics of the separated and the integrated three-phase flux-lock type superconducting fault current limiters (SFCLs) were analyzed. The three-phase flux-lock type SFCL consisted of three flux-lock reactors and three $high-T_c$ superconducting (HTSC) elements. In the integrated three-phase flux-lock type SFCL, three flux-lock reactors are connected on the same iron core. On the other hand, three flux-lock reactors of the separated three-phase flux-lock type SFCL are connected on three separated iron cores. The integrated three-phase flux-lock type SFCL showed the different fault current limiting characteristics from the separated three-phase flux-lock type SFCL that the fault phase could affect the sound phase, which resulted in quench of the HTSC element in the sound phase. Through the computer simulation applying numerical analysis for its three-phase equivalent circuit, the fault current limiting characteristics of the separated and the integrated three-phase flux-lock type SFCLs according to the ground fault types were compared.

Effect of Conductor's Arrangement and Current Direction on AC Loss Characteristics of a Fault Current Limiting Coil (도체의 배열 및 전류방향이 코일형 한류소자의 교류손실 특성에 미치는 영향)

  • Ma Y. H.;Ryu Kyung-Woo;Park K. B.;Oh Il-Sung
    • Progress in Superconductivity and Cryogenics
    • /
    • v.7 no.3
    • /
    • pp.17-20
    • /
    • 2005
  • AC loss of a high $T_c$ superconducting conductor has a strong influence on the economic viability of a superconducting fault current limiter, which offers an attractive means to limit short circuit current in the power systems. Therefore, several samples of the fault current limiting coils have been fabricated and the effect of conductor's arrangement and current direction on AC loss characteristics investigated experimentally The test result shows that the AC losses measured in the fault current limiting coils depend significantly on the conductor's arrangement. Futhermore, they are also considerably influenced by the conductor's current direction. The AC loss measured in the face-to-face arrangement is smallest among the fault current limiting coil samples.

Fabrication and characterization of fault current limiting devices made of stabilizer-free coated conductors (Stabilizer-free 초전도 선재를 이용한 한류 소자 제작 및 특성 시험)

  • Yim, Seong-Woo;Park, Chung-Ryul;Yu, Seong-Duck;Kim, Hye-Rim;Hyun, Ok-Bae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2009.06a
    • /
    • pp.371-371
    • /
    • 2009
  • For the application of superconducting wires to fault current limiting devices, it is required that they have a high rated voltage when a fault occurs. Stabilizer-free coated conductors, particularly, shows a good performance for the high rated voltage, which is beyond 0.6 V/cm. In this study, using the stabilizer-free coated conductors, we made fault current limiting devices and examined their characteristics. Fault current limiting devices were fabricated with a shape of the cylinder of a mono-filar coil winding. Stabilizer-free coated conductors were wound along the mono-filar coil line and the terminal parts between the wire and metal were soldered using In solder. Two kinds of devices were fabricated by a different method in the terminal joint, one was made by a soldering and the other was made by a soldering-free joint. Critical currents and resistance at the joint parts were measured. In addition, long-time current flowing tests were also carried out for the characterization of the fault current limiting devices.

  • PDF

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
    • /
    • v.26 no.11
    • /
    • pp.75-80
    • /
    • 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.