Development and Demonstration of a HTS Power Cable to Operate in the Long Island Power Authority Transmission Grid

A torsional twist strain effect on the critical current of a thin HTS tape has been found to be well described by a longitudinal strain model taking into account the internal shortening compressive strains accompanied with the tensile longitudinal strains due to a torsional twist. The critical current of a twisted tape is given by the integration of the critical current densities corresponding to the strain distribution over the tape cross-section using axial strain data of the tape. The model is supported with experimental results of YBCO and BSCCO-2223 tapes. It has been also found that torsional twisting effects on the critical currents of a tape composing of the conventional lapped-tape cable and the twisted stacked-tape cable are described by the same equation as that of a twisted single tape.

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“…Therefore the tensile axial longitudinal strain t of the chord AB 2 due to the torsional twist is obtained as [1] …”

Section: Longitudinal Strain In Twisted Tapementioning

confidence: 99%

“…Conventional transmission cables have been made of multiple HTS tapes lapped concentrically on a central former and enclosed in a tube cryostat [1,2]. Most HTS tape devices have been composed of a single tape or only a few tapes in parallel.…”

Section: Introductionmentioning

confidence: 99%

Torsion Strain Effects on Critical Currents of HTS Superconducting Tapes

Takayasu¹,

Minervini²,

Bromberg³

2010

AIP Conference Proceedings

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“…Many research prototypes for power cables [9][10][11], motors [12], fault current limiters [13], SMES (Superconducting Magnetic Energy Storage) [14] and transformers [15] using CC were demonstrated, and the projects for the application of superconducting AC power cables in a real power grid are now in progress in several countries [16,17].…”

Section: Introductionmentioning

confidence: 99%

Progress in research and development for REBCO coated conductors by reactive co-evaporation

Oh¹,

Kim²,

Ha³

et al. 2013

Progress in Superconductivity and Cryogenics

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This paper reviews recent progress in research and development (R&D) of reactive co-evaporation for high performance REBCO coated conductors in Korea. Two types of reactive co-evaporation methods were developed for the deposition of SmBCO and GdBCO superconducting layers respectively on the IBAD (Ion Beam Assisted Deposition)-MgO template in the Korean coated conductor project. Batch type reactive co-evaporation equipment and its processing were developed for SmBCO coated conductors at Korea Electrotechnology Research Institute (KERI) in conjunction with the Korea Advanced Institute of Science and Technology (KAIST), and a very high critical current exceeding 1,000 A/cm at 77 K in the self field was achieved through the optimization of deposition parameters. Reel-to-reel type reactive co-evaporation processing with a high conversion rate was also developed, while long length GdBCO coated conductors have been routinely produced by SuNAM Co. The minimum critical current of 422 A/cm-w at 77 K in self field was confirmed for 1 km-long GdBCO tape.

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“…As a result, practical operation of HTS cables in power systems has started in the United States and other countries [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Balanced three‐phase distribution experiment of a triaxial HTS cable

Hamajima¹,

Ozcivan²,

Shimoyama³

et al. 2011

Elect Comm in Japan

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SUMMARYHigh Temperature Superconducting (HTS) cables have been studied because of their low loss and compactness compared with conventional copper cables. Threephase cables are usually composed of three single-phase coaxial cables. Recently, triaxial cables, composed of three concentric phases, have been intensively developed, because they have advantages such as reduced amount of HTS tape, small leakage fields, and small heat loss in leaks, compared with three single-phase cables. However, there is an inherent imbalance in the three-phase currents in the triaxial cable due to differences in the radii of the threephase current layers. The imbalance of currents causes additional losses and large leakage field in the cable, and also degrades the electric power quality. Therefore, we propose a new model, a triaxial cable composed of two longitudinal sections with different twist pitches to obtain the solutions of the balanced three-phase currents and the homogeneous current distribution in each phase of the triaxial cable. We derive a general equation satisfying both the balanced three-phase currents and homogeneous current distribution, as functions of the winding pitches, and finally apply it to the simplest cable. We fabricated and tested a 1-m HTS cable in order to verify that the proposed theory can satisfy the balanced distribution. The results demonstrate the validity of the theory. We also investigated the current distributions along a long triaxial cable considering the capacitances between the layers in the triaxial cable.

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Development and Demonstration of a HTS Power Cable to Operate in the Long Island Power Authority Transmission Grid

Cited by 91 publications

References 6 publications

Torsion Strain Effects on Critical Currents of HTS Superconducting Tapes

Torsion Strain Effects on Critical Currents of HTS Superconducting Tapes

Progress in research and development for REBCO coated conductors by reactive co-evaporation

Balanced three‐phase distribution experiment of a triaxial HTS cable

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