Extra AC losses for a CICC coil due to the non-uniform current distribution in the cable

Mito, T.; Takahata, K.; Iwamoto, A.; Maekawa, R.; Yanagi, N.; Satow, T.; Motojima, O.; Yamamoto, Junya; Group, EXSIV; Sumiyoshi, F.; Kawabata, S.; Hirano, Naoki

doi:10.1016/s0011-2275(98)00029-0

Cited by 29 publications

(13 citation statements)

References 8 publications

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“…Nb3Al insert [16] Magnetic field meas. 5000 s Magnetization 1000 s LHD-IV [18] Calorimetry 124 s LHD-IS [22,23] Magnetic field meas. 2290 s JT-60SA CS model coil Magnetic field meas.…”

Section: Comparison Of Time Constants Between the Model Coil And A Shmentioning

confidence: 99%

“…These coils were fabricated and tested by the Japan Atomic Energy Research Institute. The fourth is the inner vertical (IV) coil that is used in a poloidal coil for the large helical device (LHD) developed by NIFS [17,18]. The fifth is the inner shaping (IS) coil for the LHD poloidal coil [19,20].…”

Section: Investigation Of Coils Having Long Time Constants and Consismentioning

confidence: 99%

“…The fifth is the inner shaping (IS) coil for the LHD poloidal coil [19,20]. Specifications of these coils are listed in Table 4 [7,[10][11][12][13][14][15][16][17][18][19][20].…”

Section: Investigation Of Coils Having Long Time Constants and Consismentioning

confidence: 99%

“…The longest measured time constants of these five instances and that of the JT-60SA CS model coil are listed in Table 5 [7,11,13,16,18,[21][22][23]. Each coil has an inherent time constant because the coils are composed of several different strands, conductors, and configurations, as listed in Tables 1, 2 and 4.…”

Section: Investigation Of Coils Having Long Time Constants and Consismentioning

confidence: 99%

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Magnetic field measurements of JT-60SA CS model coil

Obana

Takahata

Hamaguchi

et al. 2015

Fusion Engineering and Design

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“…Nb3Al insert [16] Magnetic field meas. 5000 s Magnetization 1000 s LHD-IV [18] Calorimetry 124 s LHD-IS [22,23] Magnetic field meas. 2290 s JT-60SA CS model coil Magnetic field meas.…”

Section: Comparison Of Time Constants Between the Model Coil And A Shmentioning

confidence: 99%

Section: Investigation Of Coils Having Long Time Constants and Consismentioning

confidence: 99%

“…The fifth is the inner shaping (IS) coil for the LHD poloidal coil [19,20]. Specifications of these coils are listed in Table 4 [7,[10][11][12][13][14][15][16][17][18][19][20].…”

Section: Investigation Of Coils Having Long Time Constants and Consismentioning

confidence: 99%

Section: Investigation Of Coils Having Long Time Constants and Consismentioning

confidence: 99%

See 2 more Smart Citations

Magnetic field measurements of JT-60SA CS model coil

Obana

Takahata

Hamaguchi

et al. 2015

Fusion Engineering and Design

Self Cite

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“…It has well reported that the main cause of non-uniform current distribution arises from joint resistance at the terminal, unbalanced inductance between layers, different impedance according to the winding pitch, etc. [1]- [6]. The determination of the critical current of a HTS apparatus and measurement of AC loss is a complicated issue [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

The effect of non-uniform current distribution on transport current loss in stacked high-T_csuperconductor tapes

Choi¹,

Nah²,

Joo³

et al. 2012

Progress in Superconductivity and Cryogenics

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Abstract--The influence of current distribution on the transport current loss in vertically stacked high-T c superconductor (HTS) tapes was evaluated. AC loss was analyzed as a function of current distribution by introducing a current distribution parameter through a numerical method (finite element analysis). AC loss under non-uniform current distribution is always higher than that for a uniformly distributed transport current in a conductor. Although the effect of non-uniformity is relatively insignificant in low transport current, AC loss increases substantially in high transport current regions as non-uniformity is enlarged. The results verify that non-uniform current distribution causes extra loss by examining the cross-sectional view of current densities in stacked conductor.

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Long‐time constants of irregular AC losses in a large superconducting coil

Hamajima

Yoshida

Shimamura

et al. 2003

Electrical Engineering Japan

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A large superconducting coil wound with a Cable‐in‐Conduit (CIC) conductor caused an additional AC loss, which cannot be estimated from the short conductor sample test results. It was confirmed that the additional AC loss was generated by long current loops in the CIC conductor. Magnetic field decays of the loops with various long‐time constants were observed through Hall probes. We propose a mechanism for the formation of the long loops. The CIC conductor is composed of several staged subcables. If one strand on the surface of a subcable contacts the other strand on the surface of the adjacent subcable, the two strands must encounter each other again at the LCM (Least Common Multiplier) distance of all staged cable pitches and thereby form a pair of long loops. We numerically traced each strand in the CIC according to a method in which the subcables at all substages rotate around the center of inertia. The calculated long‐time constants of the long loops were slightly shorter than the observed ones. We labeled all strands by order in a real CIC conductor, disassembling the cable carefully after peeling the conduit. It was found that the strands in a triplex were widely displaced from their original positions, so that their contacting lengths became longer than the calculated ones. This fact makes the time constant of the loop longer and hence can explain the observed long‐time constants. The proposed mechanism is effective for estimating the long loops causing additional AC losses in the coil. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 143(1): 50–57, 2003; Published online in Wiley InterScience (http://www.interscience.wiley.com). DOI 10.1002/eej.10064

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Extra AC losses for a CICC coil due to the non-uniform current distribution in the cable

Cited by 29 publications

References 8 publications

Magnetic field measurements of JT-60SA CS model coil

Magnetic field measurements of JT-60SA CS model coil

The effect of non-uniform current distribution on transport current loss in stacked high-T_csuperconductor tapes

Long‐time constants of irregular AC losses in a large superconducting coil

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Extra AC losses for a CICC coil due to the non-uniform current distribution in the cable

Cited by 29 publications

References 8 publications

Magnetic field measurements of JT-60SA CS model coil

Magnetic field measurements of JT-60SA CS model coil

The effect of non-uniform current distribution on transport current loss in stacked high-Tcsuperconductor tapes

Long‐time constants of irregular AC losses in a large superconducting coil

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Product

Resources

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The effect of non-uniform current distribution on transport current loss in stacked high-T_csuperconductor tapes