نتایج جستجو برای: resistive and inductive superconductor fault current limiters
تعداد نتایج: 16902794 فیلتر نتایج به سال:
With the growing demand for electricity, there is an expansion of distribution network, with insertion new elements (capacitor bank, motors, etc.) and even energy sources such as distributed generation. Such insertions can intensify transient electromagnetic current phenomena in these networks, short circuits, motor starting energizing transformers capacitor banks, being necessary analyzes to e...
In a uniform flux-flow state of a type-II superconductor, (i) the resistivity tensor p,~ is independent of the dissipative transport current density J, and (ii) there exists a constraint on the relative orientation of J and the average Aux density B. These two simple general properties can already account for the Lorentz-force independence of the resistive transition in high-T superconductors f...
Abstract The resistive transition width of a recently discovered room temperature near-ambient-pressure hydride superconductor [1] changes by more than three orders magnitude between different samples, with the nearly unchanged. For narrowest transitions, relative to $$T_c$$ T c </...
We have measured the influence of shot noise on hysteretic Josephson junctions initially in the macroscopic quantum tunneling regime. The escape threshold current into the resistive state decreases monotonically with increasing average current through the scattering conductor, which is another tunnel junction. Escape is predominantly determined by excitation due to the wideband shot noise. This...
Injection of Lower Hybrid Heating and Current Drive (LHCD) into the current ramp-up phase of JET discharges can produce extremely reversed q-profiles characterized by a core region of near zero current density (within Motional Stark Effect diagnostic measurement errors). Non-inductive, off-axis co-current drive induces a back electromotive force inside the non-inductive current radius that driv...
The quality of a superconductor-normal metal-superconductor Josephson junction (JJ) depends crucially on the transparency metal (S/N) interface. We demonstrate technique for fabricating planar JJs with perfect S/N interfaces. utilizes strong inverse proximity effect discovered in Al/V$_5$S$_8$ bilayers, by which Al layer is driven into resistive state. highly transparent homointerface and pecul...
A proximity-effect thermometer measures the temperature dependent critical supercurrent in a long superconductor normal metal superconductor (SNS) Josephson junction. Typically, the transition from the superconducting to the normal state is detected by monitoring the appearance of a voltage across the junction. We describe a new approach to detect the transition based on the temperature increas...
In the TST-2 spherical tokamak (ST), non-inductive start-up by lower-hybrid waves (200 MHz) has been studied and a plasma current of 27 kA was achieved. For comprehensive understanding wave sustained plasmas, fast electron transport model combined with an X-ray emission is constructed. The electrons in show velocity random walk induced collisional slowing down. Simultaneously, they diffusion re...
A modified flux-coupling type superconducting fault current limiter (SFCL) is proposed here for suppressing currents. The SFCL consists of a coupling transformer, an yttrium barium copper oxide (YBCO) pancake coil, and controlled switch. By flexibly adjusting the switch's contact states based on system operational conditions, transformer's primary inductance as well YBCO coil's normal-state res...
We investigate hysteresis in the transport properties of superconductor-normal-metal-superconductor (S-N-S) junctions at low temperatures by measuring directly the electron temperature in the normal metal. Our results demonstrate unambiguously that the hysteresis results from an increase of the normal-metal electron temperature once the junction switches to the resistive state. In our geometry,...
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