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Analytical formulae of coupling loss and hysteresis loss in HTS tape

✍ Scribed by N. Banno; N. Amemiya

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
333 KB
Volume
39
Category
Article
ISSN
0011-2275

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✦ Synopsis

First, the coupling time constant and a coupling loss formula are derived for High T c Super conductor (HTS) tapes, assuming their filamentary region to be an elliptical cylinder. Further, a hysteresis loss formula is given, treating the filamentary region as an elliptical cylinder and also considering the electric field-current density (E-j) characteristics to be represented with a power law. The formula of the hysteresis loss is applied in the magnetic field range much above of the full penetration field of the tape. These analytical results are compared with numerical results obtained by the finite element method. The formula of the hysteresis loss, derived for the multifilamentary composites, can be applied to the hysteresis loss in non-saturated individual filaments, assuming its shape as an ellipse.

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A.c. losses for a practical bronze-processed Nb3Sn multifilamentary composite were measured over a wide range of amplitudes (0 ~ B m ~< 14 T, 0 ~Bdc <~ 1 0 T) in transverse magnetic field with trapezoidal wave forms. The composite had a Nb or Ta barrier for ptoecting the Cu stabilizer from Sn diffus