Quench characteristics of fault current limiting element with YBCO thin film

Shimohata, Kenji; Yokoyama, Syoichi; Inaguchi, Takashi; Nakamura, Shirô; Yasuda, K.

doi:10.1109/tasc.2003.812996

Cited by 14 publications

(3 citation statements)

References 11 publications

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“…Two major power applications of YBCO thin films are resistive fault current limiters [1][2][3] and coated conductors [4][5][6]. Both the steady-state current-carrying capacity and small AC loss are important issues for these applications of YBCO thin films.…”

Section: Introductionmentioning

confidence: 99%

Influence of film width and magnetic field orientation on AC loss in YBCO thin film

Amemiya

Nishioka

Jiang

et al. 2004

Supercond. Sci. Technol.

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Three YBCO thin films on sapphire substrate with widths of 3, 5, and 10 mm were prepared, and their AC loss characteristics were studied experimentally. The total AC loss dissipated in samples carrying AC transport current in an AC transverse magnetic field was measured by an electromagnetic method. The total AC loss in YBCO film is proportional to the film width and the perpendicular magnetic field component, a component of the transverse magnetic field that is perpendicular to the film wide face. Reduction of the film width and/or the perpendicular magnetic field component is an essential means of decreasing the total AC loss. When plotting the total AC loss divided by film width against the perpendicular magnetic field component, curves for various film widths and field angles almost agree with each other. The total AC loss can be estimated by analytical expressions except in an intermediate range of the perpendicular magnetic field component. The experimental results indicate two engineering approaches for reducing the total AC loss in YBCO film: decreasing the film width and decreasing the perpendicular magnetic field component. Findings have shown empirically that decreasing the film width and decreasing sinα, where α is the field angle, are equivalently effective in reducing the total AC loss.

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Section: Introductionmentioning

confidence: 99%

Influence of film width and magnetic field orientation on AC loss in YBCO thin film

Amemiya

Nishioka

Jiang

et al. 2004

Supercond. Sci. Technol.

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“…The recent discovery of high-temperature oxide superconductors has given new impetus to the development of current limiters based on superconducting technologies, resulting in a number of prototype devices [1][2][3]. With the future introduction of such current limiters into power systems, one can expect substantial cost reduction due to the upgrading of backup circuit breakers and efficient system splitting and reconnection, as well as higher reliability and stability maintenance.…”

Section: Introductionmentioning

confidence: 99%

Study of shunt type SFCL equipped with electromagnetic repulsion switch for large capacity

Endo

Koyama

Takahashi

et al. 2010

Electrical Engineering Japan

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SUMMARYUsing a high-temperature superconductor, we constructed and tested a model Superconducting Fault Current Limiter (SFCL). The SFCL that we proposed has a vacuum interrupter with electromagnetic repulsion mechanism. We set out to construct a high-voltage-class SFCL. We produced an electromagnetic repulsion switch equipped with a 24-kV vacuum interrupter (VI). However, the opening speed becomes slower, because the larger vacuum interrupter needs a heavier-weight contact. For this reason, the current which flows in a superconductor may not be interruptible within a half cycle of current. In order to solve this problem, it is necessary to change the design of the coil connected in parallel and to strengthen the electromagnetic repulsion force at the time of opening the vacuum interrupter. Thus, the design of the coil was changed, and in order to examine whether the problem is solvable, a current limiting test was conducted. We carried out a current limiting test using second-generation (2G) HTS wire. The element used in this experiment has a stainless steel stabilizer on both sides of the wire. In the experiment we succeeded in interrupting the current of a superconductor within a half cycle.

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“…In the future electric power system, stable operation and a design which allows control of short-circuit currents are desirable. Thus, there is a need for superconducting fault current limiters (SFCL) [1][2][3][4][5][6][7]. An SFCL acts as a high impedance only when a large current flows at the time of a fault, and therefore it can control the fault current.…”

Section: Introductionmentioning

confidence: 99%

Breakdown of YBCO thin films during current limiting and methods of improving current limiting performance

Ootani

Hori

Endo

et al. 2008

Electrical Engineering Japan

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SUMMARYWe performed fault current limiting tests using YBCO thin films and investigated the reasons for their breakdown during current limiting. There were two patterns of film breakdown. One occurred immediately after current limiting and the other occurred during current limiting. In film breakdown, the quench propagation speed showed almost no change with increasing energy consumption per unit time, but the energy consumption per unit area increased with increasing energy consumption per unit time. Therefore, local areas of the film reached the melting point and arcing occurred.It is therefore concluded that the performance of the films can be improved by decreasing the energy consumption per unit time. Connecting a parallel capacitor to the film in order to limit the energy consumption per unit time is proposed and tested as a measure to improve the current limiting performance of thin films.

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Quench characteristics of fault current limiting element with YBCO thin film

Cited by 14 publications

References 11 publications

Influence of film width and magnetic field orientation on AC loss in YBCO thin film

Influence of film width and magnetic field orientation on AC loss in YBCO thin film

Study of shunt type SFCL equipped with electromagnetic repulsion switch for large capacity

Breakdown of YBCO thin films during current limiting and methods of improving current limiting performance

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