AC V-I characteristics of Ag sheathed PbBi2223 tapes up to 10 kHz: phenomena and interpretations

Yang, Y.; Beduz, C.; Spiller, D.M.; Yi, Z.; Scurlock, R.G.

doi:10.1109/77.402644

Cited by 21 publications

(4 citation statements)

References 5 publications

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“…It is common to measure AC losses due to transport current by means of voltage taps on the conductor but it has recently been pointed out that in tapes this voltage is very dependent on the position of the contacts [15,[21][22][23][24][25], and care has to be taken to obtain a true measure of the loss. There are far more flux cutting contacts at the edge than the centre of the conductor, and the voltage will be greater by a factor approximately equal to the aspect ratio of the conductor.…”

Section: Methodsmentioning

confidence: 99%

Self-field AC losses and critical currents in multi-tube Ag - Bi-2223 conductors

Ciszek

Ashworth

James

et al. 1996

Supercond. Sci. Technol.

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The purpose of this work was to investigate the influence of different technological treatments of silver sheathed Bi-2223 tapes on the critical current density and the AC transport losses. The tapes were produced using the 'tube-in-tube' technique, by including a silver rod in the centre of the superconducting powder during packing of the silver tube. The aim of the process is to increase the silver to superconductor surface area and thus also the alignment at the centre of the conductor ceramic core. AC transport losses were measured by means of an electrical method using sinusoidally varying currents in the frequency range 30-180 Hz. In this range the power losses are hysteretic. The measured variation in losses from those predicted by a critical state model is attributed to the complex geometry of superconducting regions existing in these tapes.

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Section: Methodsmentioning

confidence: 99%

Self-field AC losses and critical currents in multi-tube Ag - Bi-2223 conductors

Ciszek

Ashworth

James

et al. 1996

Supercond. Sci. Technol.

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“…When the voltage leads run along the edge of the tape (xϭw/2), the loss voltage is larger by an order of magnitude than that when they lie along the center of the tape and are immediately twisted ͑center ʈ ͒, as has been previously observed. 3,5,6 However, when the leads are twisted further away from the tape, the loss voltage actually decreases, reaching a limiting value as demonstrated in the figure for xϭ3w and xϭ6w, where w is the tape width. For the perpendicular geometry, the loss voltage is observed to initially increase by ϳ10 as the area of the measuring loop is increased ͓see Fig.…”

mentioning

confidence: 96%

Measurement of the ac power loss of (Bi,Pb)2Sr2Ca2Cu3Ox composite tapes using the transport technique

Fleshler

Cronis

Conway

et al. 1995

Applied Physics Letters

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“…Analytic solutions [6] for the critical state in thin rectangles and thin ellipses can be used to estimate the loss behaviour in a tape. At low currents, I < 0.8I c , the loss per cycle Q is given by [6]:…”

Section: Resultsmentioning

confidence: 99%

Measurements of the self-field a.c. losses in PbBi2223 tapes with different core/sheath configurations

Yang

Spiller

Beduz

et al. 1996

Supercond. Sci. Technol.

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Measurements have been made of the a.c. self-field losses in PbBi2223 tapes with different core/sheath configurations. Three different tapes have been measured, two monocore tapes with core thicknesses of 25 µm and 80 µm and a multifilamentary tape of overall thickness 200 µm. The a.c. losses have been obtained by measurement of the loss electric field E l at a sufficient distance (three times the tape half-width) from the tape axis. Measurements of the spatial dependence of the loss and inductive electric fields E l (x ) and E i (x ) have also been made. The results indicate that the 'thin' monocore tape can be adequately described by the thin-rectangle geometry whilst the behaviour of the 'thick' monocore tape lies in between those of the thin rectangle and thin ellipse. The behaviour of the multifilamentary tape follows closely that of a monocore ellipse tape indicating that there is a strong interaction between the filaments.

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AC V-I characteristics of Ag sheathed PbBi2223 tapes up to 10 kHz: phenomena and interpretations

Cited by 21 publications

References 5 publications

Self-field AC losses and critical currents in multi-tube Ag - Bi-2223 conductors

Self-field AC losses and critical currents in multi-tube Ag - Bi-2223 conductors

Measurement of the ac power loss of (Bi,Pb)2Sr2Ca2Cu3Ox composite tapes using the transport technique

Measurements of the self-field a.c. losses in PbBi2223 tapes with different core/sheath configurations

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