Effect of Peak Current Limiting in Series-Connection SFCL With Two Magnetically Coupled Circuits Using E-I Core

Lim, Sung-Hun; Kim, Young‐Pil; Ko, Seok-Cheol

doi:10.1109/tasc.2015.2509165

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…SFCL, a typical current-limiting technology, is highly advantageous owing to its superconducting properties and can reduce fault current quickly and efficiently in the right place in the event of a line-to-ground fault or a failure [16][17][18]. Most SFCL prototypes have been designed for AC systems [19][20][21][22][23][24][25][26][27]; however, R&D and basic research on the application of SFCL in DC systems is still in the early stages [28][29][30][31][32]. The topics of some published papers have been limited to evaluating optimization and economic feasibility and focus on deriving impedance values without considering the recovery characteristics of SFCL [33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

DC Current Limiting Operation and Power Burden Characteristics of a Flux-Coupling Type SFCL Connected in Series between Two Windings

Han

Lim

2021

Electronics

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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.

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Section: Introductionmentioning

confidence: 99%

DC Current Limiting Operation and Power Burden Characteristics of a Flux-Coupling Type SFCL Connected in Series between Two Windings

Han

Lim

2021

Electronics

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“…Although much research has been carried out on SCSFCLs, this has usually focused mainly on the current limiting effect in the current-limiting state [5,6], the voltage-current characteristics of the AC copper coils in normal operation [7], or the energy efficiency in terms of the DC current multiplied by the number of turns [8]. There have been few numerical simulations carried out to simulate the properties of the superconducting DC coil in SCSFCL.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Analysis of a Saturated-Core-Type Superconducting Fault Current Limiter

Jia

Ainslie

et al. 2017

IEEE Trans. Appl. Supercond.

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The saturated-core type superconducting fault current limiter (SCSFCL) is an important device to limit increasing fault currents in electrical power grids. However, there have been few numerical simulations carried out to simulate the properties of the superconducting DC coil in the SCSFCL, but such modeling is indispensable to the design and analysis of such devices. In this paper, a simulation method to simulate the SCSFCL with COMSOL Multiphysics® is presented, and the AC losses of the DC coil in the normal, nonlimiting state, which is its usual operating state, are simulated and analyzed for the first time. A strategy to simulate the AC loss of the superconducting coil with a 3D model is given first. The non-linear electric and magnetic problems are decoupled first. Next, the model is divided into smaller models for separate calculations. The 3D model is further simplified into a 2D model based on the worst-case scenario for a conservative design. The AC loss distribution within the coil is given and the relationship between the AC loss and an AC component of the current is analyzed, and it is found that the outermost coil regions have much larger AC loss than the coils near the centre.

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“…The magnetic core is a key component of electrical machines such as power transformers [1][2][3][4], rotating electrical machines [5,6], LCL filters for inverters and variable speed drives [7], peak current limiters [8], switching converters [9], variable inductors [10], etc. The time varying magnetic fields induce eddy currents in the core, and consequently some energy is converted into heat [11].…”

Section: Introductionmentioning

confidence: 99%

Lamination effects on a 3D model of the magnetic core of power transformers

et al. 2017

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Abstract:In this paper the lamination effect on the model of a power transformer's core with stacked E-I structure is analyzed. The distribution of the magnetic flux in the laminations depends on the stacking method. In this work it is shown, using a 3D FEM model and an experimental prototype, that the non-uniform distribution of the flux in a laminated E-I core with alternate-lap joint stack increases substantially the average value of the magnetic flux density in the core, compared with a butt joint stack. Both the simulated model and the experimental tests show that the presence of constructive air-gaps in the E-I junctions gives rise to a zig-zag flux in the depth direction. This interlamination flux reduces the magnetic flux density in the Ipieces and increases substantially the magnetic flux density in the E-pieces, with highly saturated points that traditional 2D analysis cannot reproduce. The relation between the number of laminations included in the model, and the computational resourses needed to build it, is also evaluated in this work.

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Effect of Peak Current Limiting in Series-Connection SFCL With Two Magnetically Coupled Circuits Using E-I Core

Cited by 7 publications

References 9 publications

DC Current Limiting Operation and Power Burden Characteristics of a Flux-Coupling Type SFCL Connected in Series between Two Windings

DC Current Limiting Operation and Power Burden Characteristics of a Flux-Coupling Type SFCL Connected in Series between Two Windings

Numerical Simulation and Analysis of a Saturated-Core-Type Superconducting Fault Current Limiter

Lamination effects on a 3D model of the magnetic core of power transformers

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