Calculation of AC losses and current distributions in high-Tc superconducting layered-conductor

Noji, H.

doi:10.1016/s0921-4534(98)00714-x

Cited by 12 publications

(2 citation statements)

References 9 publications

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“…Contrasting with the ac loss property of the tape itself, the property of the conductor fabricated by gathering the tapes with interlayer insulation has one current region at i < 2.0. The property of the conductor can be calculated by the EC model which has 15 parallel circuits with resistance and inductance [15]. Calculation by the EC model reveals that the current distribution of the current lead is non-uniform in 15 superconducting layers, and that is why the ac loss properties of the tape and the conductor are so different.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and electrical properties of a high-T_csuperconducting layered conductor

Noji¹

1999

Supercond. Sci. Technol.

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A high-Tc superconducting layered conductor designed for a small cross-section and a relatively low current capacity is fabricated by Bi-2212 tapes and interlayer insulation. The Bi-2212 tapes are prepared by the screen-printing method and the melt-solidification process with slow cooling under monotonically reduced oxygen partial pressure. Fifteen tapes with Tc value90 K and Jc value 1 × 104 A cm-2 at 77 K and 0 T are selected to construct the conductor. Dc and ac transport measurements of the conductor show that the Ic value is 250 A which is decreased by 17% from an estimation, and the ac loss is described by the Norris equation in the elliptical approximation at the normalized current i < 0.7 even though the cross-section is a rectangle.

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Section: Resultsmentioning

confidence: 99%

Fabrication and electrical properties of a high-T_csuperconducting layered conductor

Noji¹

1999

Supercond. Sci. Technol.

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“…We have reported that the electric-circuit (EC) model is useful for an analysis of ac properties in HTS conductors [3][4][5]. In this paper, we show a method of calculating the ac losses by using the EC model for the HTS cable.…”

Section: Introductionmentioning

confidence: 99%

Alternating current loss calculation in a high-T_Csuperconducting transmission cable considering the magnetic field distribution

Noji

Haji

Hamada

2002

Supercond. Sci. Technol.

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We have calculated the alternating current (ac) losses of a 114 MVA high-T C superconducting (HTS) transmission cable using an electric-circuit (EC) model. The HTS cable is fabricated by Tokyo Electric Power Company and Sumitomo Electric Industries, Ltd. The EC model is comprised of a resistive part and an inductive part. The resistive part is obtained by the approximated Norris equation for a HTS tape. The Norris equation indicates hysteresis losses due to self-fields. The inductive part has two components, i.e. inductances related to axial fields and those related to circumferential fields. The layer currents and applied fields of each layer were calculated by the EC model. By using both values, the ac losses of the one-phase HTS cable were obtained by calculation considering the self-field, the axial field and the circumferential field of the HTS tape. The measured ac loss transporting 1 kA rms is 0.7 W m −1 ph −1 , which is equal to the calculation. The distribution of each layer loss resembles in shape the distribution of the circumferential field in each layer, which indicates that the circumferential fields strongly influence the ac losses of the HTS cable.

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Reduction of alternating current loss in a high-TC superconducting transmission cable by means of helical pitch adjustment

2004

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Calculation of AC losses and current distributions in high-Tc superconducting layered-conductor

Cited by 12 publications

References 9 publications

Fabrication and electrical properties of a high-T_csuperconducting layered conductor

Fabrication and electrical properties of a high-T_csuperconducting layered conductor

Alternating current loss calculation in a high-T_Csuperconducting transmission cable considering the magnetic field distribution

Reduction of alternating current loss in a high-TC superconducting transmission cable by means of helical pitch adjustment

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Calculation of AC losses and current distributions in high-Tc superconducting layered-conductor

Cited by 12 publications

References 9 publications

Fabrication and electrical properties of a high-Tcsuperconducting layered conductor

Fabrication and electrical properties of a high-Tcsuperconducting layered conductor

Alternating current loss calculation in a high-TCsuperconducting transmission cable considering the magnetic field distribution

Reduction of alternating current loss in a high-TC superconducting transmission cable by means of helical pitch adjustment

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Product

Resources

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Fabrication and electrical properties of a high-T_csuperconducting layered conductor

Fabrication and electrical properties of a high-T_csuperconducting layered conductor

Alternating current loss calculation in a high-T_Csuperconducting transmission cable considering the magnetic field distribution