Theory of ac loss in power transmission cables with second generation high temperature superconductor wires

Clem, John R.; Malozemoff, A. P.

doi:10.1088/0953-2048/23/3/034014

Cited by 31 publications

(39 citation statements)

References 17 publications

(41 reference statements)

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“…The net currents in the two winding layers can then be confirmed to be equal, a result often referred to as "inductive balancing." This simple analysis also leads to the astonishing conclusion that the current within each tape of the outer winding layer spirals within each tape's HTS layer [17]. Studies of 2 G HTS wires confirm that the perpendicular current density is sufficiently high to accommodate the required radial transfer of current at the edges [19].…”

Section: Contributions In Applied Superconductivitymentioning

confidence: 84%

“…Many of these results were cleared and published in two recent papers, the last completed just a few months before he died [17], [18].…”

Section: Contributions In Applied Superconductivitymentioning

confidence: 99%

“…These papers introduced what Clem's associates came to call "Clem diagrams" in which the helically wound structure is conceptually slit and each layer laid out flat [1], [17]. On the assumption that the tapes are electrically separated but infinitesimally close and that they conform to the cylindrical shape of the former, Clem summarized the basic rules to determine the current flows in the tapes and magnetic field directions around and in-between the layers.…”

Section: Contributions In Applied Superconductivitymentioning

confidence: 99%

“…Clem extended the analysis to include the effect of magnetic substrates, determining that current flows in the twolayer counter-wound configuration were drastically affected by magnetism between the two HTS layers [17]. On the basis of the derived current flows, he calculated the ac loss in these configurations.…”

Section: Contributions In Applied Superconductivitymentioning

confidence: 99%

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John R. Clem: Contributions to the Phenomenology of Superconductivity

Malozemoff

2015

IEEE Trans. Appl. Supercond.

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John Clem, Distinguished Professor of Physics at Iowa State University and Ames Laboratory, who passed away in August 2013, was for many decades one of the world's leading contributors to the phenomenology of superconductivity. His fundamental contributions included elucidating domain structures in Type I superconductors, modeling reversible magnetization and upper critical field of high temperature superconductors (HTS), introducing the concept of "pancake" vortices in highly anisotropic HTS materials, and developing the theory of flux cutting. He also took a great interest in applied superconductivity and consulted for organizations such as IBM, Pirelli Cables and AMSC, deriving the microwave properties of HTS films, elucidating the mechanism of current flow in first generation HTS wires, establishing the transport measurement of ac loss in tapes, and calculating ac loss of fault current limiter coils and HTS power cables. As founder and chief editor of High-Tc Update, he also provided much needed perspective on the torrent of developments during the early years of HTS discoveries.Index Terms-AC loss, flux cutting, high temperature superconductors (HTS), HTS power cables, pancake vortices, superconductor intermediate state.

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Section: Contributions In Applied Superconductivitymentioning

confidence: 84%

“…Many of these results were cleared and published in two recent papers, the last completed just a few months before he died [17], [18].…”

Section: Contributions In Applied Superconductivitymentioning

confidence: 99%

Section: Contributions In Applied Superconductivitymentioning

confidence: 99%

Section: Contributions In Applied Superconductivitymentioning

confidence: 99%

See 2 more Smart Citations

John R. Clem: Contributions to the Phenomenology of Superconductivity

Malozemoff

2015

IEEE Trans. Appl. Supercond.

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“…For the works on twolayer HTS cables made of coated conductors with a ferromagnetic substrate, Amemiya et al [24] performed numerical AC loss calculations of two-layer superconducting power transmission cables comprising coated conductors with a ferromagnetic substrate concerning the arrangement with respect to the cable axis. Clem and Malozemoff [25] proposed a theory of AC transport loss in HTS power transmission cables made of secondgeneration (2G) wires with magnetic substrate. Experimental studies on AC loss of two-layer HTS power transmission cables made of 2G wires with a ferromagnetic substrate are presented in [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of AC loss of two-layer HTS power transmission cables composed of coated conductors with a ferromagnetic substrate

Yıldız¹,

İnanır²,

Çiçek³

et al. 2017

Turk J Elec Eng & Comp Sci

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This work includes the simulation of hysteretic AC losses in two-layer HTS power transmission cables made of second-generation high-temperature superconducting tapes with a ferromagnetic substrate subject to an oscillating AC transport current, calling upon the COMSOL Multiphysics finite-element software program and exploiting an AC/DC module. How the AC transport loss is influenced by the arrangement of tapes, as well as the optimized design of superconducting power cables based on YBCO-coated conductors, are investigated. According to the radial arrangement of the tapes, four different orientations of ferromagnetic substrate are considered: 1) out-in (substrate of inner/outer layer facing outward/inward), 2) in-out (substrate of inner/outer layer facing inward/outward), 3) in-in (substrates of both inner and outer layers facing inward), and 4) out-out (substrates of both inner and outer layers facing outward).We found that the AC loss of the superconducting layer for the out-in arrangement is the lowest. We also compare our calculations with experimental results.

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New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

et al. 2021

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condensed matter physics, including cell membranes, [1] nematic crystals, [2,3] superfluids, [4] semiconductors, [5][6][7][8] ferromagnets, [9] and superconductors. [10,11] Currently, much attention is paid to strongly correlated electronic systems, for example, ferromagnets and superconductors, as they provide a unique tool to manipulate the topology of coexisting vector and scalar fields, associated with geometries of conventional systems.Until recently, in the case of magnetism, the influence of the geometry on the spin vector fields was addressed primarily by the design of the sample boundaries. This approach naturally brings the shape anisotropy to the system and leads to the formation of specific spin textures, for example, magnetic vortices [12] and antivortices [13] as well as provides control over the dynamics of the topologically nontrivial magnetic solitons. [14][15][16][17][18] This discussion also tackles the state of the art in modern experimental antiferromagnetism, where the design of the sample topography and boundaries allows to control the domain wall states. [19][20][21][22] With the development of novel fabrication techniques allowing to realize complex 3D architectures, not only the boundary effects but also the extrinsic geometrical properties (e.g., local curvatures) can be addressed rigorously for the case of ferromagnets [23][24][25][26][27] as well as superconductors. [28][29][30] The explored effects are directly related to the interplay between the Traditionally, the primary field, where curvature has been at the heart of research, is the theory of general relativity. In recent studies, however, the impact of curvilinear geometry enters various disciplines, ranging from solid-state physics over soft-matter physics, chemistry, and biology to mathematics, giving rise to a plethora of emerging domains such as curvilinear nematics, curvilinear studies of cell biology, curvilinear semiconductors, superfluidity, optics, 2D van der Waals materials, plasmonics, magnetism, and superconductivity. Here, the state of the art is summarized and prospects for future research in curvilinear solid-state systems exhibiting such fundamental cooperative phenomena as ferromagnetism, antiferromagnetism, and superconductivity are outlined. Highlighting the recent developments and current challenges in theory, fabrication, and characterization of curvilinear micro-and nanostructures, special attention is paid to perspective research directions entailing new physics and to their strong application potential. Overall, the perspective is aimed at crossing the boundaries between the magnetism and superconductivity communities and drawing attention to the conceptual aspects of how extension of structures into the third dimension and curvilinear geometry can modify existing and aid launching novel functionalities. In addition, the perspective should stimulate the development and dissemination of research and development oriented techniques to facilitate rapid transitions from laboratory demonstrations to industry-...

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Theory of ac loss in power transmission cables with second generation high temperature superconductor wires

Cited by 31 publications

References 17 publications

John R. Clem: Contributions to the Phenomenology of Superconductivity

John R. Clem: Contributions to the Phenomenology of Superconductivity

Numerical study of AC loss of two-layer HTS power transmission cables composed of coated conductors with a ferromagnetic substrate

New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

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