• Title/Summary/Keyword: HTSC element

Search Result 37, Processing Time 0.017 seconds

Current Limiting and Voltage Sag Suppressing Characteristics of Flux-lock Type SFCL According to Variations of Turn Number's Ratio (자속구속형 초전도전류제한기의 권선비 변화에 따른 전류제한 및 전압강하 보상 특성)

  • Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.24 no.5
    • /
    • pp.410-415
    • /
    • 2011
  • In this paper, we investigated the fault current limiting and the load voltage sag suppressing characteristics of the flux-lock type SFCL, designed with the additive polarity winding, according to the variations of turn number's ratio and the comparative analysis between the resistive type and the flux-lock type SFCLs were performed as well. From the analysis for the short-circuit tests, the flux-lock type SFCL designed with the larger turn number's ratio was shown to perform more effective fault current limiting and load voltage sag suppressing operations compared to the flux-lock type SFCL designed with the lower turn number's ratio through the fast quench occurrence of the high-$T_C$ superconducting (HTSC) element comprising the flux-lock type SFCL. In addition, the recovery time of the flux-lock type SFCL after the fault removed could be confirmed to be shorter in case of the flux-lock type SFCL designed with the lower turn number ratio.

Analysis on Current Limiting Characteristics of a Fault-lock Type SFCL Applied into a Simulated Power System (모의전력계통에 적용된 자속구속형 초전도 전류제한기의 전류제한 특성 분석)

  • Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.24 no.2
    • /
    • pp.141-146
    • /
    • 2011
  • When the current of the superconducting element exceeds its critical current by the fault occurrence, the quench of the high-$T_C$ superconducting fault current limiter (HTSC) comprising the flux-lock type superconducting fault current limiter (SFCL) occurs. Simultaneously, the magnetic flux in the iron core induces the voltage in each coil, which contributes to limit the fault current. In this paper, the fault current limiting characteristics of the flux-lock type SFCL as well as the load voltage sag suppressing characteristics according to the flux-lock type SFCL's winding direction were investigated. To confirm the fault current limiting and the voltage sag suppressing characteristics of the this SFCL, the short-circuit tests for the simulated power system with the flux-lock type SFCL were carried out. The flux-lock type SFCL designed with the additive polarity winding was shown to perform more effective fault current limiting and load voltage sag suppressing operations through the fast quench occurrence right after the fault occurs and the fast recovery operation after the fault removes than the flux-lock type SFCL designed with the subtractive polarity winding.

Fault Current Limiting Characteristics of Flux-lock Type SFCL with Several Secondary Windings

  • Lim, Sung-Hun;Park, Chung-Ryul;Han, Byoung-Sung;Park, Hyoung-Min;Cho, Yong-Sun;Choi, Hyo-Sang
    • Transactions on Electrical and Electronic Materials
    • /
    • v.6 no.5
    • /
    • pp.193-197
    • /
    • 2005
  • We investigated fault current limiting characteristics of the flux-lock type superconducting fault current limiter (SFCL), which consisted of a primary winding and several secondary windings connected in series between $high-T_C$ superconducting (HTSC) thin films. Each YBCO thin film has a 2 mm wide and 42 cm long meander line with 14 stripes of different length. The power imbalance due to the slight difference of Ie between YBCO current limiting elements causes the significant power burden on YBCO element with lower $I_C$. We confirmed from our experiments that the mutual coupling between the primary winding and secondary windings of the flux-lock type SFCL reduced the power imbalance between YBCO current limiting elements compared with the resistive type SFCL connected in series.

Current Limiting Characteristic of Flux-Lock Type High-Tc Superconducting Fault Current Limiter (자속 구속형 고온초전도 전류제한기의 전류제한 특성)

  • Park Hyung Min;Choi Hyo Sang;Lim Sung Hun;park Chung Ryul;Han Byung Sung;Lee Sang Il;Chung Soo Bok;Oh Geum Kon;Hyun Ok Bae;Chung Dong Chul
    • Proceedings of the KIEE Conference
    • /
    • summer
    • /
    • pp.633-635
    • /
    • 2004
  • The current limiting characteristics of the flux-lock type superconducting fault current limiters(SFCLs) were investigated. The flux-lock type SFCL consists of a flux-lock reactor and high-T_c superconducting (HTSC) element. In this SFCL the initial limiting current level can be controlled by adjusting the inductances of two coils. In this paper, the operational characteristics of the flux-lock type SPCL were analyzed and the current Limiting characteristics of it were investigated through the experiments.

  • PDF

Improvement of Current Limiting and Recovery Characteristics in Series Connection Type SFCL with Added Third Winding (3차권선이 추가된 직렬연결형 초전도한류기의 전류제한 및 회복 특성 향상)

  • Ko, Seok-Cheol;Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.28 no.8
    • /
    • pp.62-68
    • /
    • 2014
  • The series connection type superconducting fault current limiter (SFCL) with added third winding, which was magnetically coupled in one iron core, was proposed. The proposed SFCL was expected to be more improved by just adding third winding into the conventional series connection type SFCL with two coils. To analyze the contribution of the third winding for the current limiting and the recovery characteristics of the SFCL, the short-circuit tests for the series connection type SFCL with the added third winding were performed together with the analysis on its electrical equivalent circuit. From the comparative analysis on the amplitude of the limited fault current and the power burden of the high-TC superconducting (HTSC) element comprising this SFCL, the improved current limiting and recovery characteristics of the series connection type SFCL using the third winding could be confirmed.

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 Operational Characteristics of Distance Relay due to Application of Superconducting Fault Current Limiter in a Simulated Power Transmission System (모의 송전계통에 초전도한류기의 적용에 따른 거리계전기의 동작특성 연구)

  • Noh, Shin-Eui;Kim, Jin-Seok;Kim, Yi-Gwan;Kim, Jae-Chul;Lim, Sung-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.28 no.8
    • /
    • pp.40-46
    • /
    • 2014
  • The development of the superconducting fault current limiter (SFCL) to apply into a power transmission system where makes larger fault current compared to the power distribution system has been performed. Among various SFCLs, the trigger-type SFCL is suitable for application into the power transmission system due to the effective reduction on power burden of the high temperature superconducting element (HTSC) for the larger fault current. To protect the power transmission line in the power grid, the distance relay, which decides to interrupt fault section where can be calculated by the measured voltage and current from sound grid, is one of important protective devices in the power transmission system. However, the operation of the distance relay from the impedance of the fault point on the transmission line is affected by the impedance of the trigger-type SFCL. Therefore, the analysis on the operational characteristics of distance relay considering the application of the SFCL is required. In this paper, the effect on the operation zones of the distance relay by the impedance of the SFCL in a power transmission system was analyzed through the PSCAD/EMTDC simulation.