Study of HTS Insert Coils for High Field Solenoids

Lombardo, V.; Barzi, E.; Norcia, G.; Lamm, M.J.; Turrioni, D.; Raes, T. Van; Zlobin, A.V.; Weisend, J. G.

doi:10.1063/1.3422481

Cited by 7 publications

(7 citation statements)

References 5 publications

(6 reference statements)

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“…Numerous data fits are found in the literature that characterize some if not all of the transport critical current angular dependence in (RE)BCO coated conductors with respect to the magnetic flux density orientation [5][6][7][8][9][10]. The following examples, by no means exhaustive, incorporate the mathematical definitions and notation of this article.…”

Section: Previous Modelsmentioning

confidence: 99%

Practical fit functions for transport critical current versus field magnitude and angle data from (RE)BCO coated conductors at fixed low temperatures and in high magnetic fields

Hilton

Gavrilin

Trociewitz

2015

Supercond. Sci. Technol.

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Applications of (RE = Y, Gd)BCO coated conductors for the generation of high magnetic fields are increasing sharply, this while (RE)BCO coated conductors themselves are evolving rapidly. This article describes and demonstrates recently developed and applied mathematical models that systematically and comprehensively characterize the transport critical current angular dependence of a batch of (RE)BCO coated conductor in high magnetic fields at fixed temperatures with an uncertainty of 10% or better. The model development was based on analysis of experimental data sets from various published sources and coated conductors with different microstructures. These derivations directly are applicable to the accurate prediction of the performance in high magnetic fields of coils wound with (RE)BCO coated conductors. In particular, a nonlinear fit is discussed in this article of transport critical current at T = 4.2 K versus field and angle data. This fit was used to estimate the hysteresis losses of (RE)BCO coated conductors in high magnetic fields, and to design the inserts wound with such conductors of the all-superconducting 32 T magnet being constructed at the NHMFL. A series of such fits, recently developed at several fixed temperatures, continues to be used to simulate the quench behavior of that magnet.

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Section: Previous Modelsmentioning

confidence: 99%

Practical fit functions for transport critical current versus field magnitude and angle data from (RE)BCO coated conductors at fixed low temperatures and in high magnetic fields

Hilton

Gavrilin

Trociewitz

2015

Supercond. Sci. Technol.

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“…Obviously, the field and angle dependence of the I c and n-index of the short sample are obtained using point-by-point measurement which is very time consuming. Measurement of the critical current I c of the HTS short sample as a function of applied field, with the temperature considered as a parameter, is often used [6,22,[39][40][41]. Moreover, the producers of the HTS tapes generally only report the results of the I c (B) measurements done in parallel and perpendicular orientation of the tape with respect to applied field [22].…”

Section: Criterion E Smentioning

confidence: 99%

Differences between two definitions of the critical current of HTS coils

Pitel¹

2013

Supercond. Sci. Technol.

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Definition of the critical current of a coil made of anisotropic high temperature superconducting conductor is rather complicated and ambiguous, since the magnetic field generated across the winding can differ considerably in relation to both its magnitude and orientation. Two definitions of the critical current of such coils are discussed. The first definition, very often used in calculations to analyze the current carrying capacity, electric field and power dissipation of individual turns, represents an operating current at which an electric field of 1 µV cm −1 appears on one turn. The second definition represents an integral approach, and is used in experiments. This definition introduces the critical current of the coil as an operating current at which an average electric field E s , usually 0.1 µV cm −1 , appears on coil terminals. As an example, the distribution of the critical current and electric field of individual turns in the winding of a BSCCO model coil was analyzed. Critical currents of the coil as a function of an external magnetic field parallel with the coil axis were calculated according to both definitions. The results show that the first definition, which characterizes the winding at the local level, is suitable for HTS coils either operating in self-field or in a low external field, because the differences between the critical currents and n-indices of individual turns are considerable. The second criterion is suitable for the HTS coils operating in high fields, i.e. like high field insert coils. The self-field of a high field insert coil is negligible if the external field is high. As a result, the critical currents of all turns are almost identical, and the anisotropy in I c (B) characteristic plays practically no role. Rather unexpected behavior of the voltage-current characteristic of the model coil is predicted if an external field is applied.

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“…For any other purposes, permission must be obtained from the IEEE by emailing pubs-permissions@ieee.org. The critical current of the HTS tape depends on the field and also the angle between the field and the HTS tape [14]. To simplify the problem, the resultant field is used to assess the critical current.…”

Section: B Operating Condition Of the Hts Windingmentioning

confidence: 99%

A Pole Pair Segment of a 2-MW High-Temperature Superconducting Wind Turbine Generator

Song

Mijatović

Kellers³

et al. 2017

IEEE Trans. Appl. Supercond.

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A 2 MW high temperature superconducting (HTS) generator with 24 pole pairs has been designed for the wind turbine application. In order to identify potential challenges and obtain practical knowledge prior to production, a fullsize stationary experimental setup , which is one pole pair segment of the full generator, has been built and tested. The experimental setup comprises a consequent-pole HTS rotor and a conventional three-phase copper stator. This paper first presents the electromagnetic designs of the full generator and the setup , then it goes to compare the performance of the full generator and the setup in terms of the flux density, the operating condition of the HTS winding, and the force-generation capability. Finite element (FE) software MagNet is used to carry out numerical simulations. The findings show that the HTS winding in the setup is a good surrogate for these that would be used in the full generator. The FE simulations also tell that the maximum tangential force generated in the setup is 3.77% lower than that in the full generator. Good agreement between the values of interest in the setup and those projected in the full generator has revealed a costeffective prototyping methodology for developing HTS machines.

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Study of HTS Insert Coils for High Field Solenoids

Cited by 7 publications

References 5 publications

Practical fit functions for transport critical current versus field magnitude and angle data from (RE)BCO coated conductors at fixed low temperatures and in high magnetic fields

Practical fit functions for transport critical current versus field magnitude and angle data from (RE)BCO coated conductors at fixed low temperatures and in high magnetic fields

Differences between two definitions of the critical current of HTS coils

A Pole Pair Segment of a 2-MW High-Temperature Superconducting Wind Turbine Generator

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