Seok-Cheol Ko

ORCID: 0000-0002-8830-5348
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Research Areas
  • HVDC Systems and Fault Protection
  • High-Voltage Power Transmission Systems
  • Superconducting Materials and Applications
  • Physics of Superconductivity and Magnetism
  • Power Systems Fault Detection
  • Silicon Carbide Semiconductor Technologies
  • Advancements in Semiconductor Devices and Circuit Design
  • Thin-Film Transistor Technologies
  • Power Systems and Renewable Energy
  • GaN-based semiconductor devices and materials
  • Surface and Thin Film Phenomena
  • Engineering Applied Research
  • Cardiac Structural Anomalies and Repair
  • Internet of Things and Social Network Interactions
  • Force Microscopy Techniques and Applications
  • Gaze Tracking and Assistive Technology
  • Corrosion Behavior and Inhibition
  • Photovoltaic System Optimization Techniques
  • Energy and Environmental Systems
  • Concrete Corrosion and Durability
  • Plasma Diagnostics and Applications
  • Metal and Thin Film Mechanics
  • Power Systems and Technologies
  • Silicon and Solar Cell Technologies
  • Electrical Fault Detection and Protection

Kongju National University
2014-2023

Soongsil University
2016

Jungwon University
2014

Jeonbuk National University
2003-2005

The advantage of the flux-lock-type superconducting fault current limiter (SFCL) is that operational SFCL can be easily adjusted by winding ratio and direction between two windings. Furthermore, peak limiting operation according to transient initial was reported performed adding third another element into with either one or magnetic paths. In this paper, magnetizing characteristics modified SFCL, due its operation, which were added E-I iron core structure paths, analyzed. To analyze...

10.1109/tasc.2016.2539976 article EN IEEE Transactions on Applied Superconductivity 2016-03-15

10.1016/j.mssp.2014.11.025 article EN Materials Science in Semiconductor Processing 2014-11-30

The microwave plasma-torch and its application for decomposition of chemical warfare agent using a moderate power are investigated. Decomposition agents is demonstrated phosgene (COCl/sub 2/) as sample example. main byproducts CO Cl/sub 2/. 2/ gas was completely converted to HCl by injecting NH/sub 3/ into the an additive gas. is, in turn, eliminated passing exhaust through wet-scrubber. Detailed properties at atmospheric pressure also investigated making use Fourier transform infrared, mass...

10.1109/tps.2005.844595 article EN IEEE Transactions on Plasma Science 2005-04-01

In this paper, we proposed a series-connection-type superconducting fault current limiter (SFCL) that can prevent the internal magnetic flux generation of cores during normal operation and saturation due to sudden at initial stage occurrence while limiting peak current. The SFCL does not mediate two cores, as previously reported, but mediates single E-I core having configuration magnetically coupled circuits using first, second, third windings. other path is formed by coil element isolated...

10.1109/tasc.2015.2509165 article EN IEEE Transactions on Applied Superconductivity 2015-12-31

In this paper, the transformer-type superconducting fault current limiter (SFCL) with additional circuit, which could limit through twice quench operations, was suggested. The suggested SFCL includes one primary winding, two nonisolated secondary windings wound on same iron core, and high-TC elements connected each winding. advantage of is that it can perform limiting operations due to transient amplitude current. Among its design parameters, winding direction another comprising circuit or...

10.1109/tasc.2018.2793236 article EN IEEE Transactions on Applied Superconductivity 2018-01-23

In this paper, the fault current limiting (FCL) characteristics of a flux-coupled type superconducting limiter (SFCL) with parallel connection between two windings in DC system were analyzed. The SFCL was composed coils connected and element (SE), which series secondary coil. works systems similar to those AC systems. Before occurs, respective magnetic fluxes generated by offset each other, maintaining voltage induced at zero. case fault, however, resistance is SE, preventing from offsetting...

10.3390/en14041096 article EN cc-by Energies 2021-02-19

In this paper, a DC fault short circuit was conducted to analyze the current limiting characteristics of flux-coupling type superconducting limiter (SFCL) that has two coils connected in series via one iron core. Similar AC power system, SFCL which with each other and secondary coil element parallel, remains state before short-circuit accident occurs. This results magnetic flux getting generated by windings offsetting induced voltage at remaining zero. However, event on line, resistance is...

10.3390/electronics10091087 article EN Electronics 2021-05-04

In this paper, we investigated the peak current limiting characteristics of flux-lock type superconducting fault limiter (SFCL) with two magnetically coupled circuits. The SFCL circuits has similar to using its third winding. operation is performed by generation magnetic flux between coils when a happens and are dependent on winding direction coils. To confirm it, were analyzed based electrical equivalent circuit through experiment. Through analysis short-circuit results, it was shown that...

10.1016/j.phpro.2013.05.028 article EN Physics Procedia 2013-01-01

In this paper, a flux-lock type superconducting fault current limiter (SFCL) using two triggered high-Tc (HTSC) elements was proposed and its limiting characteristics according to short-circuit location were analyzed. The SFCL with HTSC consists of parts. One is magnetically coupled coils serial connection. other, which connected in series the second coil, composed parallel through normal resistor. Since amplitude depends on case occurs power system, suggested can perform operation quench...

10.1016/j.phpro.2013.05.026 article EN Physics Procedia 2013-01-01

A flux-coupling type superconducting fault current limiter (SFCL) was fabricated to have two magnetic flux paths using an E-I iron core, and the winding direction between main coils a subtractive polarity winding. During period, peak limiting characteristics voltage waveforms primary secondary windings were compared according parallel series configurations. In addition, linkages instantaneous powers analyzed by connecting in series. When connected series, magnetizing power area linkage's...

10.1109/tasc.2019.2908602 article EN IEEE Transactions on Applied Superconductivity 2019-04-22

Photovoltaic (PV) generation has been growing dramatically over the last years and it ranges from small, rooftop-mounted or building integrated systems, to large utility scale power stations. Especially for PV system, modules are serially connected match with inverter input voltage specification. For shading is a problem since shaded module reduces output whole string of modules. The excess unshaded dissipated in module. In this paper, dissipation under partial analyzed circuit analysis...

10.11591/ijece.v11i2.pp1029-1035 article EN International Journal of Power Electronics and Drive Systems/International Journal of Electrical and Computer Engineering 2021-02-06

Three-phase transformer type superconducting fault current limiter (SFCL) using two modules (SCMs) between secondary windings, which consisted of three-phase windings wound on three legs E-I iron core, one SCM with insulated connection winding and another non-insulated other were suggested. For the suggested SFCL SCMs, its ground limiting operations analyzed through phasor diagram from electrical equivalent circuit. To verify operation SCMs faults applied into power simulated system SFCL....

10.1109/tasc.2022.3181571 article EN IEEE Transactions on Applied Superconductivity 2022-06-20

In this article, DC fault current limiting characteristics of flux-lock type superconducting limiter (SFCL) with parallel connection between two coils were analyzed. SFCL was composed windings connected in and modules (SMs), which series each secondary winding. SFCLs a one SM winding thought to perform operation as AC system. However, since the transient period after resistance generation approaches into constant value, unlike system, there is period. Therefore, effect disappears system...

10.1109/tasc.2023.3253467 article EN IEEE Transactions on Applied Superconductivity 2023-03-27

Superconducting fault current limiters (SFCLs) are emerging as an alternative to limit in AC and DC power systems. SFCLs can perform faster limiting operation automatic detection recovery, regardless of the type fault. In this paper, a laboratory-scale prototype SFCL was fabricated analyzed for its magnetization characteristics due magnetizing according change number windings pairs. This bridge consists two high-Tc superconducting (HTSC) elements on one iron core. When coils were changed...

10.1109/tasc.2021.3057318 article EN IEEE Transactions on Applied Superconductivity 2021-01-01

In this paper, the transformer type superconducting fault current limiter (SFCL) with two nonisolated secondary windings was suggested and its peak limiting characteristics were analyzed. The SFCL largely consists of high-TC elements, one primary winding, windings, which are wound on same iron core. Except for structure has similar operation to previously reported triggering levels. However, different from previous SFCL. To confirm operational currents, tests according angle, affects...

10.1109/tasc.2018.2808600 article EN IEEE Transactions on Applied Superconductivity 2018-02-22

In this paper, the dual peak current limiting characteristics of superconducting fault limiters (SFCLs) using iron cores were compared to each other. The SFCLs connected in series between two coils (N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> and N xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ). However, differently source location. power burden these could be varied depending on design factors, such as location coils. Using...

10.1109/tasc.2018.2798646 article EN IEEE Transactions on Applied Superconductivity 2018-01-30
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