AC Loss Characteristics of a Cylindrical High Temperature Superconductor

Ma, Y.H.; Li, Z.Y.; Ryu, K.; Choi, Seyong; Park, K.B.; Oh, I.S.; Song, Han Jung; Cha, Gueesoo

doi:10.1109/tasc.2007.898326

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…The temperature coefficient gives a reasonable normal-state resistivity curve and I b (T ) is 25% above the critical current, which can be considered as realistic. The exponent n is given a mean typical value already described in the literature [10,11].…”

Section: Simulation Detailsmentioning

confidence: 99%

Extending the range of applicability of HTS cylinders in inductive superconducting fault current limiters

Osorio

Lorenzo

Veira

et al. 2007

Supercond. Sci. Technol.

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Here, we study the behaviour of an inductive superconducting fault current limiter (SFCL) whose secondary is a bulk cylinder with an array of appropriately distributed weak zones. This design allows heat to be removed by conduction from the hot weak zones, which absorb the power dissipation, to the remaining colder parts of the cylinder. Our work highlights the possibility of overcoming the limitations of high power SFCLs based on bulk cylinders, which present recovery time values well beyond the maximum value tolerated in a distribution line.

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Section: Simulation Detailsmentioning

confidence: 99%

Extending the range of applicability of HTS cylinders in inductive superconducting fault current limiters

Osorio

Lorenzo

Veira

et al. 2007

Supercond. Sci. Technol.

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“…All experiments in this work were performed at the liquid nitrogen temperature of 77 K, and the AC loss was determined by integrating the product of transport current and voltage between voltage taps during one period. The details on experiments are explained in [3], [4].…”

Section: Methodsmentioning

confidence: 99%

“…AC loss estimation on the conductor that consists of dozens of HTS tapes in parallel is specially difficult because of inherent complexities; for example, the uneven critical current of the tapes due to degradation during handling, the non-uniform current distribution among tapes, tape's arrangement, and the error-signal picked up into a voltage lead by the out-of-phase AC currents of adjacent tapes [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Transport Mode on AC Loss Characteristics of a Bi-2223 Tape in a Multi-Tape Conductor

Ryu

et al. 2008

IEEE Trans. Appl. Supercond.

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The high-temperature superconductor (HTS) with large current capacity has been developed for power applications such as power transmission cables and fault current limiters. Especially, in these power applications, AC loss is very important in an economic point of view but this issue has not been completely elucidated due to its many complexities. In this work, two HTS conductors with very different critical current densities, which consist of several Bi-2223 tapes placed on a cylindrical former, were fabricated in an attempt to arrive at a clear understanding of their AC loss characteristics. AC loss characteristics for such two cylindrical multi-tape conductors have been experimentally investigated. Moreover, the influence of current transport mode on the AC loss of the Bi-2223 tape in the conductors was investigated. DC voltage-current characteristics of the Bi-2223 tapes were also measured for discussions on the measured AC losses. The results show that for the conductor with high critical current density, the measured AC loss strongly depends on the transport mode as in the conductor with low critical current density. However, the transport mode dependence of the conductor with high critical current density becomes weaker and weaker as transport current increases. In the simultaneous mode, the measured AC loss of the conductor with low critical current density is in good agreement with the calculated loss from the monoblock model. However, the measured loss of the conductor with high critical current density does not coincide with both the numerically calculated loss and loss calculated from the monoblock mode.Index Terms-AC loss, current transport mode, cylindrical multi-tape conductor, high and low critical current density, N-value.

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“…Although many studies on the AC loss of the cylindrical surface HTS tapes have been presented, [17] the AC loss behavior of an HTS conductor with a thin tube has not been established because of its complexities. [18] In this Letter, we analyze the AC loss of a thin HTS tube carrying an AC current in an AC magnetic field with the same phase as the current by means of a numerical method based on the critical current state and a thin strip approximation. The side view and cross-section of the thin HTS tube in numerical analysis are shown in Figs.…”

mentioning

confidence: 99%

AC Alternating-Current Loss Analyses of a Thin High-Temperature Superconducting Tube Carrying AC Transport Current in AC External Magnetic Field

Wang

Dong

et al. 2010

Chinese Phys. Lett.

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Numerical simulations on the AC loss characteristics in a thin high-temperature superconducting (HTS) tube are presented. Geometry of the HTS conductor is modeled as a tube with negligible thickness, and assumed to carry a transport current with the same phase as an AC externally applied magnetic field perpendicular to the axis. Based on the classical theory of AC loss with the Bean critical current model, the distribution of critical current density 𝑗𝑐 and AC loss 𝑄 are obtained by means of numerical analysis. The results are in very good agreement with experiments. A double-peak profile is observed in the curve of the critical current density distribution along the azimuth angle. This numerical simulation method is suitable for a thin HTS tube, which may be applicable on a thin tube configuration consisting of coated superconductors.

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AC Loss Characteristics of a Cylindrical High Temperature Superconductor

Cited by 12 publications

References 6 publications

Extending the range of applicability of HTS cylinders in inductive superconducting fault current limiters

Extending the range of applicability of HTS cylinders in inductive superconducting fault current limiters

Influence of Transport Mode on AC Loss Characteristics of a Bi-2223 Tape in a Multi-Tape Conductor

AC Alternating-Current Loss Analyses of a Thin High-Temperature Superconducting Tube Carrying AC Transport Current in AC External Magnetic Field

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