Inductive Superconducting Fault Current Limiters With Y123 Thin-Film Washers Versus Bi2223 Bulk Rings as Secondaries

Osorio, Manuel; Lorenzo, Juan A.; Toimil, Paula; Ferro, Gonzalo; Veira, J.A.; Vidal, F.

doi:10.1109/tasc.2006.874960

Cited by 8 publications

(14 citation statements)

References 20 publications

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“…In this scenario, a long time can be several seconds for some low critical current density samples or even ms or µs for thin-film microbridges. The importance of these aspects and the need of a fast acquisition system which applies short current pulses is remarked, for instance, in references [12,13,14].…”

Section: Voltage-current Curvesmentioning

confidence: 99%

Demonstration experiments for solid-state physics using a table-top mechanical Stirling refrigerator

Osorio¹,

Palacio-Morales²,

Rodrigo³

et al. 2012

Eur. J. Phys.

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Liquid free cryogenic devices are acquiring importance in basic science and engineering. But they can also lead to improvements in teaching low temperature an solid state physics to graduate students and specialists. Most of the devices are relatively expensive, but small sized equipment is slowly becoming available. Here, we have designed several simple experiments which can be performed using a small Stirling refrigerator. We discuss the measurement of the critical current and temperature of a bulk YBa 2 Cu 3 O 7−δ (YBCO) sample, the observation of the levitation of a magnet over a YBCO disk when cooled below the critical temperature and the observation of a phase transition using ac calorimetry. The equipment can be easily handled by students, and also used to teach the principles of liquid free cooling.

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Section: Voltage-current Curvesmentioning

confidence: 99%

Demonstration experiments for solid-state physics using a table-top mechanical Stirling refrigerator

Osorio¹,

Palacio-Morales²,

Rodrigo³

et al. 2012

Eur. J. Phys.

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“…These results open the possibility of future investigations into SFCL devices based on those superconducting ceramics in low power electronics and electrical motor. [11][12][13][14] and Bi 2 Sr 2 Ca 2 Cu 3 O8+d [14,15] . However, other high-Tc compounds are possible.…”

Section: Introductionmentioning

confidence: 99%

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

et al. 2014

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“…The refrigeration and thermal behaviour of the superconducting elements are aspects of crucial importance for the overall performance of these devices. Thin film samples present several advantages to be used in current limiting applications [4,8,9]. We have studied the use of this kind of samples in two up to now nearly unexplored configurations.…”

mentioning

confidence: 99%

Thermal behaviour of high-temperature superconducting fault current limiters: Application to microlimiters

Lorenzo-Fernández

Osorio

Veira

et al. 2010

Journal of Physics and Chemistry of Solids

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a b s t r a c tFault current limiters are one of the most promising applications of high-temperature superconductors. Two important and interrelated aspects of these devices are their thermal behaviour and their refrigeration. Here we will present some results of our recent researches about this topic concerning the possibility of using superconducting thin-film microbridges as very efficient microlimiters intended to operate at very low powers as could be superconducting microelectronics applications (SQUID based electronics, infrared detectors, etc.).& 2010 Published by Elsevier Ltd.Superconducting fault current limiters (SFCL) based on high temperature superconductors (HTSC) of different types, inductive, resistive or hybrid (i.e. inductive-resistive), have being extendedly studied [1][2][3][4][5][6][7]. The refrigeration and thermal behaviour of the superconducting elements are aspects of crucial importance for the overall performance of these devices. Thin film samples present several advantages to be used in current limiting applications [4,8,9]. We have studied the use of this kind of samples in two up to now nearly unexplored configurations. One is a hybrid limiting device based on meandered HTSC thin-films refrigerated by using a thermoacoustic refrigerator [10], and the other a resistive FCL based on ''thermally small'' superconducting microbridges [9] intended to operate at very low powers (SQUID based electronics, infrared detectors, etc.). In this work we will summarize some of our recent results on this last issue.In Fig. 1 we show a typical electric field versus current density (EÀ J) curve, corresponding to one of the microbridges (denoted BS7) used in our experiments. This microbridge, whose length, width and thickness are, respectively, 385 mm, 28 mm and 300 nm, and with T c ¼ 88.6 K, has been grown on a sapphire substrate. The two characteristic current densities are indicated in this figure:The critical, J c , at which dissipation first appears, and the so-called supercritical, J * , at which the microbridge is triggered into highly dissipative states. Let us note here that we have chosen for our studies microbridges of these dimensions to guarantee a good thermal behaviour before, during and after the current fault, as we will see below. In addition, the widths of our microbridges are well above the threshold at which J * is sample-width dependent [11]. The strong increase of E for current densities around J * make this type of samples very useful for FCL. However, the current is effectively limited only for electric fields or, equivalently, applied voltages well above that at which the limiter is triggered from normal operation (sample in the superconducting state) to current fault mode. In addition, once J * is attained, a thermal runaway [12,13] can be provoked which causes the reduction of the circulating current well below the nominal value (i.e., the current in normal operation without a fault) or very important damage on the microbridge (that can be even burnt out).The superconducting ...

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Inductive Superconducting Fault Current Limiters With Y123 Thin-Film Washers Versus Bi2223 Bulk Rings as Secondaries

Cited by 8 publications

References 20 publications

Demonstration experiments for solid-state physics using a table-top mechanical Stirling refrigerator

Demonstration experiments for solid-state physics using a table-top mechanical Stirling refrigerator

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

Thermal behaviour of high-temperature superconducting fault current limiters: Application to microlimiters

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