This page has only limited features, please log in for full access.
In this paper, a DC fault short circuit was conducted to analyze the DC fault current limiting characteristics of a flux-coupling type superconducting fault current limiter (SFCL) that has two coils connected in series via one iron core. Similar to the AC power system, the flux-coupling type SFCL in a DC system, which has the two coils connected with each other in series and the secondary coil connected with the superconducting element in parallel, remains in the superconducting state before a short-circuit accident occurs. This results in magnetic flux getting generated by the two windings connected in series offsetting each other and the induced voltage at the two windings remaining at zero. However, in the event of a short-circuit accident on the DC line, a resistance is generated on the superconducting element, so that the magnetic flux generated at the two windings no longer offsets each other. Therefore, a voltage is induced on the two windings, and the fault current is limited accordingly. As a result of configuring a DC short-circuit device and experimenting with this SFCL, we could confirm the DC fault current limiting effect of a flux-coupling type SFCL with two windings connected in series. In addition, we could establish performance conditions of the flux-coupling type SFCL in a DC system by inferring the fault current, operating current, and limited impedance equations according to the connection direction of the flux-coupling type SFCL with two windings connected in series and by analyzing fault current limiting degree, power burden, magnetic flux, and energy consumption for each element composing the SFCL.
Seok-Cheol Ko; Tae-Hee Han; Sung-Hun Lim. DC Current Limiting Operation and Power Burden Characteristics of a Flux-Coupling Type SFCL Connected in Series between Two Windings. Electronics 2021, 10, 1087 .
AMA StyleSeok-Cheol Ko, Tae-Hee Han, Sung-Hun Lim. DC Current Limiting Operation and Power Burden Characteristics of a Flux-Coupling Type SFCL Connected in Series between Two Windings. Electronics. 2021; 10 (9):1087.
Chicago/Turabian StyleSeok-Cheol Ko; Tae-Hee Han; Sung-Hun Lim. 2021. "DC Current Limiting Operation and Power Burden Characteristics of a Flux-Coupling Type SFCL Connected in Series between Two Windings." Electronics 10, no. 9: 1087.
In this paper, the fault current limiting (FCL) characteristics of a flux-coupled type superconducting fault current limiter (SFCL) with parallel connection between two windings in a DC system were analyzed. The flux-coupled type SFCL was composed of two coils connected in parallel and a superconducting element (SE), which was connected in series with the secondary coil. The flux-coupled type SFCL works in DC systems similar to those in AC systems. Before a fault occurs, the respective magnetic fluxes generated by the two coils connected in parallel offset each other, maintaining the voltage induced in the two coils at zero. In case of a fault, however, resistance is generated in the SE, preventing the magnetic fluxes generated by the two coils from offsetting each other. Thus, some voltage is induced in the two coils, and this starts to limit the fault current. DC short circuit tests were conducted, and the test results confirmed that the flux-coupled type SFCL with the two parallel connected coils was effective in limiting the fault current in a DC system. Additionally, the effect of the wiring direction of the two coils on the SFCL’s FCL performance and operating current, limiting impedance, and instantaneous power load was further analyzed, and as a result, the performance conditions of the SFCL in a DC system were determined.
Young-Pil Kim; Seok-Cheol Ko. DC Current Limiting Characteristics of Flux-Coupled Type SFCL Using Superconducting Element Connected in Parallel in a DC System. Energies 2021, 14, 1096 .
AMA StyleYoung-Pil Kim, Seok-Cheol Ko. DC Current Limiting Characteristics of Flux-Coupled Type SFCL Using Superconducting Element Connected in Parallel in a DC System. Energies. 2021; 14 (4):1096.
Chicago/Turabian StyleYoung-Pil Kim; Seok-Cheol Ko. 2021. "DC Current Limiting Characteristics of Flux-Coupled Type SFCL Using Superconducting Element Connected in Parallel in a DC System." Energies 14, no. 4: 1096.
In this study, the characteristics of the double quench and instantaneous power of a superconducting fault current limiter (SFCL) using two magnetically coupled windings were analyzed. In the proposed model of SFCL, two magnetically coupled windings are wound on the iron core and each winding is connected to one superconducting element. When a fault occurs, the SFCL can limit the fault current by the double quench occurrence of two superconducting elements. In order to analyze the influence of the winding direction on the fault current limiting characteristics of the proposed SFCL, two magnetically coupled windings were designed to allow the same and the reverse directions. From the simulated short circuit experiment, the currents and the voltages of two coupled windings and two superconducting elements were measured and the instantaneous power and the double quench occurrence were analyzed. It was confirmed from the experimental results analysis that the fault current limiting characteristics of the SFCL were more favorable in the reverse winding direction than in the same winding direction.
Seok-Cheol Ko; Tae-Hee Han; Sung-Hun Lim. Analysis on Double Quench and Instantaneous Power of SFCL Using Two Magnetically Coupled Windings According to Winding Direction. Energies 2020, 13, 5533 .
AMA StyleSeok-Cheol Ko, Tae-Hee Han, Sung-Hun Lim. Analysis on Double Quench and Instantaneous Power of SFCL Using Two Magnetically Coupled Windings According to Winding Direction. Energies. 2020; 13 (21):5533.
Chicago/Turabian StyleSeok-Cheol Ko; Tae-Hee Han; Sung-Hun Lim. 2020. "Analysis on Double Quench and Instantaneous Power of SFCL Using Two Magnetically Coupled Windings According to Winding Direction." Energies 13, no. 21: 5533.
In this paper, a transformer type superconducting fault current limiter (SFCL) with two isolated secondary windings was fabricated to increase the current limiting capacity. As the magnetization current increased due to the large transient fault current immediately after the fault, the magnetization force variation, the operating range of the flux linkage, and the voltage region variation were compared at fault angles of 0° and 90°, respectively. The short-circuit test analyzed the current limiting operation, power consumption, and energy consumption characteristics according to the fault angle immediately after the fault occurrence. The results showed that the fault angle of 0° could limit the fault current much more than the fault angle of 90°. In addition, it was confirmed that the magnetization force variation, the operating range of the flux linkage, and the voltage induced in the primary winding were all much larger at the fault angle of 0° than at the fault angle of 90°.
Tae-Hee Han; Sung-Hun Lim; Seok-Cheol Ko. Magnetization Characteristics Due to Fault Angle of Transformer Type SFCL with Two Isolated Secondary Windings. Journal of Electrical Engineering & Technology 2020, 15, 2501 -2508.
AMA StyleTae-Hee Han, Sung-Hun Lim, Seok-Cheol Ko. Magnetization Characteristics Due to Fault Angle of Transformer Type SFCL with Two Isolated Secondary Windings. Journal of Electrical Engineering & Technology. 2020; 15 (6):2501-2508.
Chicago/Turabian StyleTae-Hee Han; Sung-Hun Lim; Seok-Cheol Ko. 2020. "Magnetization Characteristics Due to Fault Angle of Transformer Type SFCL with Two Isolated Secondary Windings." Journal of Electrical Engineering & Technology 15, no. 6: 2501-2508.
A bridge type superconducting fault current limiter (SFCL) with simultaneous quench using two high-temperature superconducting (HTSC) elements and two coils was fabricated to analyze the fault current limiting characteristics. Before and after the fault occurrence, the current limiting operation and the voltage waveforms of each device were compared according to the change of the input voltage. We also analyzed flux linkages and instantaneous powers of the bridge type SFCL with simultaneous quench using flux-coupling composed of HTSC elements with different critical currents. During the fault period, the magnetization power area and the flux linkage’s operating range variation due to the magnetizing current were compared with each other.
Seok-Cheol Ko; Tae-Hee Han; Sung-Hun Lim. Magnetizing Characteristics of Bridge Type Superconducting Fault Current Limiter (SFCL) with Simultaneous Quench Using Flux-Coupling. Energies 2020, 13, 1760 .
AMA StyleSeok-Cheol Ko, Tae-Hee Han, Sung-Hun Lim. Magnetizing Characteristics of Bridge Type Superconducting Fault Current Limiter (SFCL) with Simultaneous Quench Using Flux-Coupling. Energies. 2020; 13 (7):1760.
Chicago/Turabian StyleSeok-Cheol Ko; Tae-Hee Han; Sung-Hun Lim. 2020. "Magnetizing Characteristics of Bridge Type Superconducting Fault Current Limiter (SFCL) with Simultaneous Quench Using Flux-Coupling." Energies 13, no. 7: 1760.
In this paper, a bridge type superconducting fault current limiter (SFCL) with a single high-temperature superconducting (HTSC) element is proposed to allow fault current limiting operation in direct current (DC) conditions. First, the principle of operation of the bridge type SFCL with a single HTSC element using flux-coupling was presented. After the fault occurrence, the fault current limiting operation and voltage characteristics, the power load characteristics of each device, and the energy consumption of the two coils and the HTSC element were analyzed in the proposed SFCL. As a result, it is confirmed that in the case of the additive polarity winding, the power consumption and the energy consumption of the HTSC element were lower than those in the subtractive polarity winding, and the fault current limiting characteristics were excellent.
Tae-Hee Han; Seok-Cheol Ko; Sung-Hun Lim. Fault Current Limiting Characteristics of a Small-Scale Bridge Type SFCL with Single HTSC Element Using Flux-Coupling. Electronics 2020, 9, 569 .
AMA StyleTae-Hee Han, Seok-Cheol Ko, Sung-Hun Lim. Fault Current Limiting Characteristics of a Small-Scale Bridge Type SFCL with Single HTSC Element Using Flux-Coupling. Electronics. 2020; 9 (4):569.
Chicago/Turabian StyleTae-Hee Han; Seok-Cheol Ko; Sung-Hun Lim. 2020. "Fault Current Limiting Characteristics of a Small-Scale Bridge Type SFCL with Single HTSC Element Using Flux-Coupling." Electronics 9, no. 4: 569.
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 the two main coils was a subtractive polarity winding. During the fault period, peak current limiting characteristics and voltage waveforms between the primary and secondary windings were compared according to the parallel and series configurations. In addition, flux linkages and instantaneous powers characteristics were analyzed by connecting the two main coils in parallel and in series. When the two main coils were connected in parallel and in series, the magnetizing power area and the flux linkage's operating range related to the magnetic flux energy accumulated in the iron core were compared with each other, depending on the magnetization current increase or decrease.
Seok-Cheol Ko; Tae-Hee Han; Sung-Hun Lim. Magnetizing Characteristics of a Flux-Coupling Type SFCL With Two Magnetic Flux Paths Using Its Third Winding. IEEE Transactions on Applied Superconductivity 2019, 29, 1 -5.
AMA StyleSeok-Cheol Ko, Tae-Hee Han, Sung-Hun Lim. Magnetizing Characteristics of a Flux-Coupling Type SFCL With Two Magnetic Flux Paths Using Its Third Winding. IEEE Transactions on Applied Superconductivity. 2019; 29 (5):1-5.
Chicago/Turabian StyleSeok-Cheol Ko; Tae-Hee Han; Sung-Hun Lim. 2019. "Magnetizing Characteristics of a Flux-Coupling Type SFCL With Two Magnetic Flux Paths Using Its Third Winding." IEEE Transactions on Applied Superconductivity 29, no. 5: 1-5.
In this paper, the dual peak current limiting characteristics of superconducting fault current limiters (SFCLs) using dual iron cores were compared to each other. The SFCLs were connected in series between two coils ($N_{1}$, $N_{2}$). However, the two coils were connected differently to the current source location. The dual peak current limiting characteristics and power burden of these SFCLs could be varied depending on design factors, such as the current source location between the two coils. Using a short-circuit simulation experiment, we compared and analyzed the operating status of the two superconducting elements and their peak current limiting characteristics based on the current source location.
Byunggyu Yu; Tae-Hee Han; Sung-Hun Lim; Young-Pil Kim; Seok-Cheol Ko. Comparison of Dual Peak Current Limiting Operation for a Series-Connected SFCL Using Two Iron Cores. IEEE Transactions on Applied Superconductivity 2018, 28, 1 -4.
AMA StyleByunggyu Yu, Tae-Hee Han, Sung-Hun Lim, Young-Pil Kim, Seok-Cheol Ko. Comparison of Dual Peak Current Limiting Operation for a Series-Connected SFCL Using Two Iron Cores. IEEE Transactions on Applied Superconductivity. 2018; 28 (4):1-4.
Chicago/Turabian StyleByunggyu Yu; Tae-Hee Han; Sung-Hun Lim; Young-Pil Kim; Seok-Cheol Ko. 2018. "Comparison of Dual Peak Current Limiting Operation for a Series-Connected SFCL Using Two Iron Cores." IEEE Transactions on Applied Superconductivity 28, no. 4: 1-4.
In this paper, the transformer type superconducting fault current limiter (SFCL) with additional circuit, which could limit the fault current through twice quench operations, was suggested. The suggested SFCL includes one primary winding, two non-isolated secondary windings wound on the same iron core and two high-TC superconducting (HTSC) elements connected with each secondary winding. The advantage of the suggested SFCL is that it can perform the twice current limiting operations due to the transient amplitude of the fault current. Among its design parameters, the winding direction of another secondary winding comprising the additional circuit of the trans-former type SFCL or the non-isolated secondary winding is ex-pected to affect its fault current limiting characteristics. To ana-lyze the dependence of the fault current limiting operation on the winding direction of two non-isolated secondary windings, two limiting operational currents from its electrical equivalent circuit were derived. Through the fault current limiting tests for the suggested SFCL, the fault current limiting characteristics of the SFCL were discussed.
Tae-Hee Han; Seck-Cheol Ko; Sung-Hun Lim; Seok-Cheol Ko. Fault Current Limiting Characteristics of Transformer-Type Superconducting Fault Current Limiter Due to Winding Direction of Additional Circuit. IEEE Transactions on Applied Superconductivity 2018, 28, 1 -6.
AMA StyleTae-Hee Han, Seck-Cheol Ko, Sung-Hun Lim, Seok-Cheol Ko. Fault Current Limiting Characteristics of Transformer-Type Superconducting Fault Current Limiter Due to Winding Direction of Additional Circuit. IEEE Transactions on Applied Superconductivity. 2018; 28 (3):1-6.
Chicago/Turabian StyleTae-Hee Han; Seck-Cheol Ko; Sung-Hun Lim; Seok-Cheol Ko. 2018. "Fault Current Limiting Characteristics of Transformer-Type Superconducting Fault Current Limiter Due to Winding Direction of Additional Circuit." IEEE Transactions on Applied Superconductivity 28, no. 3: 1-6.