Numerical Analysis of AC Loss Characteristics of Cable Conductor Assembled by HTS Tapes in Polygonal Arrangement

Fukui, Satoshi; Kojima, Rie; Ogawa, J.; Yamaguchi, M.; Satô, Takao; Tsukamoto, O.

doi:10.1109/tasc.2006.870818

Cited by 27 publications

(22 citation statements)

References 7 publications

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“…This is due to the fact that when the number of tapes increases the gap between the tapes decreases and for smaller gaps each tape experiences a magnetic field which is predominantly parallel to its width, whereas the perpendicular component near its edges tends to be smaller. The same observation has been reported in previous studies [2,3]. Since the former radius is fixed, for a given number of tapes a smaller pitch length (i.e.…”

Section: Application Of the Im To Analysis Of Single Layer Twisted Tapessupporting

confidence: 85%

“…Note that FEM simulation took more than 3 days to be solved while overall computation time of IM (included the matrix generation) was less than an hour. In addition, we applied the IM model to find the current distribution inside the tape in one of the cases simulated in [3] (N=8 and tape width=10 mm), and we got exactly the same results (not shown here). …”

Section: Validation Methodologymentioning

confidence: 57%

“…Several 2D methods neglecting the twisted configuration have been proposed for computing AC losses in HTS cables [1][2][3][4]. While providing useful information on the AC losses, these methods cannot be used for designing purposes, where finding the optimal twist design is an important issue.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new numerical approach to find current distribution and AC losses in coaxial assembly of twisted HTS tapes in single layer arrangement

Siahrang

Sirois

Grilli

et al. 2010

J. Phys.: Conf. Ser.

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A new numerical approach to find current distribution and AC losses in coaxial assembly of twisted HTS tapes in single layer arrangement Abstract. This paper presents a novel technique for evaluating AC losses and current distribution in single layer assemblies of coaxially wound thin conductors, such as YBCO coated conductors. The proposed approach takes into account the twisted geometry of the individual superconducting tapes by considering the integral relation between the magnetic vector potential and the current density in the tapes (Biot-Savart formula). The integrals are solved numerically and semi-analytically, and the results are used to generate a discretized system of equations based on the magnetic flux diffusion equation (eddy current problem). The latter is solved using an efficient time transient solver (DASPK). It is assumed that, due to the helical symmetry of the problem, it is sufficient to solve for the current distribution in half of a single tape crosssection, even if many tapes are present, which allows a drastic reduction of the 3-D problem to a simple 1-D domain. The method was used to evaluate the AC losses of a HTS cable made of coated conductors, and it was observed that for a given radius of the former and number of tapes, twisted tapes with smaller pitch have lower AC losses.

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Section: Application Of the Im To Analysis Of Single Layer Twisted Tapessupporting

confidence: 85%

Section: Validation Methodologymentioning

confidence: 57%

See 1 more Smart Citation

A new numerical approach to find current distribution and AC losses in coaxial assembly of twisted HTS tapes in single layer arrangement

Siahrang

Sirois

Grilli

et al. 2010

J. Phys.: Conf. Ser.

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show abstract

“…2 Because superconducting cables contain multiple superconducting wires, the electromagnetic interaction among those wires must be taken into account. Numerical calculation of ac losses of superconducting cables has been extensively reported, [3][4][5][6][7][8][9][10][11] but no analytical investigation has been reported to date.…”

mentioning

confidence: 99%

Hysteretic ac loss of polygonally arranged superconducting strips carrying ac transport current

Mawatari

Komori

2008

Applied Physics Letters

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The hysteretic ac loss of a current-carrying conductor in which multiple superconducting strips are polygonally arranged around a cylindrical former is theoretically investigated as a model of superconducting cables. Using the critical state model, we analytically derive the ac loss Qn of a total of n strips. The normalized loss Qn/Q1 is determined by the number of strips n and the ratio of the strip width 2w to the diameter 2R of the cylindrical former. When n ≫ 1 and w/R ≪ 1, the behavior of Qn is similar to that of an infinite array of coplanar strips.

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“…In case of AC SC-PT cable, self-field of HTS cable configuration affects AC loss properties [10]- [13]. A small gap between the HTS tapes in a single layer can reduce the AC loss, since the perpendicular magnetic field component of the self-field reduces at the tape edge due to the currents in the surrounding HTS tapes [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Critical Current and Its Magnetic Field Effect Measurement of HTS Tapes Forming DC Superconducting Cable

Hamabe

Sugino

Watanabe

et al. 2011

IEEE Trans. Appl. Supercond.

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We constructed a test stand of 20 m-class DC superconducting power transmission cable in Chubu University, in 2006. The cable consisted of thirty-nine Bi-2223 HTS tapes in two layers; nineteen tapes were used in the first layer and twenty tapes were used in the second layer. One of the features of the cable is that each HTS tape in the first layer is electrically isolated. Therefore, we can apply the current to the individual HTS tapes in the first layer. We measured critical current of the one HTS tape in the first layer when current was applied to the other HTS tapes, and compared the result with the magnetic field calculation due to the applied current. The critical current increased by 2 4% when the current was applied to all other eighteen HTS tapes in the same layer. From the magnetic field calculation, we concluded that the self magnetic field of the measured HTS tape was eliminated at the tape edge by the applied magnetic field from the neighbor HTS tapes, and then the critical current increased.

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Numerical Analysis of AC Loss Characteristics of Cable Conductor Assembled by HTS Tapes in Polygonal Arrangement

Cited by 27 publications

References 7 publications

A new numerical approach to find current distribution and AC losses in coaxial assembly of twisted HTS tapes in single layer arrangement

A new numerical approach to find current distribution and AC losses in coaxial assembly of twisted HTS tapes in single layer arrangement

Hysteretic ac loss of polygonally arranged superconducting strips carrying ac transport current

Critical Current and Its Magnetic Field Effect Measurement of HTS Tapes Forming DC Superconducting Cable

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