Performance summary of a 4,000 a high temperature superconducting cable conductor prototype

Gannon, J. L.; Minot, Michael J.; Buczek, D.; Vellego, G.; Metra, P.

doi:10.1109/77.402707

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…Actually, when one subtracts from the measured curve a quadratic curve with appropriate parameters, a curve is obtained that coincides with the loss curve estimated from the monoblock medel, except for a slight translation in the loss axis. The frequency dependence in low Ip can be approximated by a power curve with an index of the order of 1.5 [4,6] (but, for the onelayer conductor, the losses vary linearly with the frequency, as expected). Such an increase in the Losses in the low-current range could be due to the following factors.…”

Section: Losses In the Low-current Rangementioning

confidence: 55%

“…(i) The conductor self-field is pure tangential. This is justified by the fact that the conductor IcfI&Hse,f curve, with H, lf the field produced by conductor IC at the conductor surface, 'practically coincides with the Ic/IcOHpdlel curve for the single tape [4]. The IC fI.ffmm,,,, cuwe for the single tape decreases much faster than the other curves.…”

Section: Generalmentioning

confidence: 92%

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An analysis of the transport losses measured on HTSC single-phase conductor prototypes

Vellego

Metra

1995

Supercond. Sci. Technol.

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An analysis was made of published results of transport losses measured on state of the art KTSC single-phase conductor prototypes. Fitting the data to simple existing models was attempted and the agreement is reasonably acceptable for cable design purposes. The measured and estimated losses agree within a factor of two, in a range of peak transport current between 0.3 and 1.0 of the conductor DC critical current. The model used in this current range is one that considers the conductor as a solid sc tube in its own (purely tangential) self-field. The eddy losses are estimated as in a standard procedure for non-magnetic helical multilayer reinforcements and armours, and turn out to be negligible.for this geometly. Losses higher than predicted are measured on two or more layer conductors in the low-current range, being typically for a peak transport current below 0.3 of the oc transport current of the conductor. In order to explain this, it is suggested that there might be a dephasing in the AC threshold voltages of the tapes, due to the variation of the in-field critical currents of the tapes across the conductor layers. Problems that are common to this type of measurement are discussed too. The simple model is not directly applicable to the more practical case of a non-coaxial trefoil configuration, because in this case a transverse field is also present, produced on each of the three conductors by the two others. Therefore, the losses need to be measured and modelled also on the trefoil configuration, to obtain reliable data in this practical case too.HTSC materials.

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Section: Losses In the Low-current Rangementioning

confidence: 55%

Section: Generalmentioning

confidence: 92%

An analysis of the transport losses measured on HTSC single-phase conductor prototypes

Vellego

Metra

1995

Supercond. Sci. Technol.

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“…Recently, AC loss in Bi-2223 silver-sheathed wire has been extensively studied, and it has been reported that hysteresis loss from the superconducting core is the major loss for monofilamentary wire [6][7][8], while eddy currents in the silver sheath are the governing component in multifilamentary wire [8]. Moreover AC loss in the HTSC power-cable conductor, in which Bi-2223 wires are wrapped in a helix around a flexible core and the structure is multilayer with interlayer insulation, has been reported [9][10][11]. Fujikami et al [11] investigated the AC loss of the HTSC power-cable conductor, which has a four-layer structure with interlayer insulation, 7 m length and I c = 1500 A (J c = 10 000 A cm −2 ) for the 10 −13 m criterion, and reported that the AC loss of this conductor was explained well by regarding it as a continuous cylindrical superconductor and by assuming the critical state model [11].…”

Section: Introductionmentioning

confidence: 99%

AC loss of a high- superconducting power-cable conductor

Noji

1997

Supercond. Sci. Technol.

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We investigate the AC loss of a high-T c superconducting power-cable conductor with four layers and interlayer insulation. The electric-circuit model is applied for the calculation of the AC loss of the conductor. The result of a calculation for the AC loss shows that the calculated value is nearly equal to the experimental value; therefore this model explains the electromagnetic property of the conductor well. Moreover the result of a calculation for the current distribution of the conductor indicates that almost all the current passes through the outer layer when the transport current is less than the I c of the conductor. Finally we calculate the relation between AC loss and the spiral pitch of the high-T c superconducting wires which make up the conductor. It is found that the AC loss is markedly decreased when the spiral pitch is less than 0.5 m.

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AC Characteristic of a High-Tc Superconducting Power-Cable Conductor with Interlayer Insulation

Noji

Shibata

Isojima

et al. 1998

Advances in Superconductivity X

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Performance summary of a 4,000 a high temperature superconducting cable conductor prototype

Cited by 9 publications

References 2 publications

An analysis of the transport losses measured on HTSC single-phase conductor prototypes

An analysis of the transport losses measured on HTSC single-phase conductor prototypes

AC loss of a high- superconducting power-cable conductor

AC Characteristic of a High-Tc Superconducting Power-Cable Conductor with Interlayer Insulation

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