Alternating current loss characteristics of a Roebel cable consisting of coated conductors and a three-dimensional structure

The three-dimensional structure of Roebel cables consisting of coated conductors influences their ac loss characteristics. Measurements of the ac loss and numerical electromagnetic field analyses were carried out using a six-strand Roebel cable as well as several reference conductors: a single straight coated conductor, a 3???1 stack, where three straight coated conductors were stacked, and a 3???2 stack, where two 3???1 stacks were placed side by side. The measured and calculated ac losses of the Roebel cable and those of the reference conductors were compared with one another. The ac loss characteristics were discussed on the basis of the electromagnetic phenomena inside the superconductors obtained from numerical electromagnetic field analyses. The influence of the three-dimensional structure of the Roebel cable on its ac loss characteristics was verified on the basis of the experimental and numerical results.

[1]  R.A. Badcock,et al.  Progress in the Manufacture of Long Length YBCO Roebel Cables , 2009, IEEE Transactions on Applied Superconductivity.

[2]  C. F. Hempstead,et al.  CRITICAL PERSISTENT CURRENTS IN HARD SUPERCONDUCTORS , 1962 .

[3]  N. Amemiya,et al.  Numerical analysis of AC losses in high T/sub c/ superconductors based on E-j characteristics represented with n-value , 1997, IEEE Transactions on Applied Superconductivity.

[4]  Rodney A. Badcock,et al.  Frequency dependence of magnetic ac loss in a five strand YBCO Roebel cable , 2010 .

[5]  W. T. Norris,et al.  Calculation of hysteresis losses in hard superconductors carrying ac: isolated conductors and edges of thin sheets , 1970 .

[6]  Shigeo Nagaya,et al.  Lateral Jc distribution of YBCO coated conductors fabricated by IBAD/MOCVD process , 2006 .

[7]  R. Badcock,et al.  AC loss measurements in pancake coils wound with 2G tapes and Roebel cable: dependence on spacing between turns/strands , 2012 .

[8]  Jozef Kvitkovic,et al.  Frequency-dependent critical current and transport ac loss of superconductor strip and Roebel cable , 2011 .

[9]  Takashi Komeda,et al.  Total AC loss measurements in a six strand Roebel cable carrying an AC current in an AC magnetic field , 2013 .

[10]  Pascal Tixador,et al.  Electrical characterization of REBCO Roebel cables , 2013 .

[11]  Francesco Grilli,et al.  Simulation of ac loss in Roebel coated conductor cables , 2010 .

[12]  M. Iwakuma,et al.  AC loss properties of YBCO superconducting tapes fabricated by IBAD–PLD technique , 2004 .

[13]  R. Badcock,et al.  Experimental Comparison of AC Loss in REBCO Roebel Cables Consisting of Six Strands and Ten Strands , 2014, IEEE Transactions on Applied Superconductivity.

[14]  Francesco Grilli,et al.  A full 3D time-dependent electromagnetic model for Roebel cables , 2013 .

[15]  Rodney A. Badcock,et al.  Narrow strand YBCO Roebel cable for lowered AC loss , 2008 .

[16]  Zhenan Jiang,et al.  An experimental method for total AC loss measurement of high Tc superconductors , 2004 .

[17]  W. Goldacker,et al.  ROEBEL Assembled Coated Conductors (RACC): Preparation, Properties and Progress , 2007, IEEE Transactions on Applied Superconductivity.

[18]  S. Awaji,et al.  Quantitative strain measurement in Nb3Sn wire and cable conductors using high-energy x-ray and neutron beams , 2013 .

[19]  Brandt,et al.  Type-II-superconductor strip with current in a perpendicular magnetic field. , 1993, Physical review. B, Condensed matter.

[20]  Susumu Sato,et al.  Magnetic flux penetration into twisted multifilamentary coated superconductors subjected to ac transverse magnetic fields , 2006 .

[21]  Rodney A. Badcock,et al.  Comparison of transport AC losses in an eight-strand YBCO Roebel cable and a four-tape YBCO stack , 2011 .

[22]  Naoyuki Amemiya,et al.  Transport AC loss measurement of a five strand YBCO Roebel cable , 2009 .

[23]  M. Ohya,et al.  Lateral critical current density distributions degraded near edges of coated conductors through cutting processes and their influence on ac loss characteristics of power transmission cables , 2011 .

[24]  Naoyuki Amemiya,et al.  Corrigendum: Three-dimensional model for numerical electromagnetic field analyses of coated superconductors and its application to Roebel cables , 2012 .

[25]  Naoyuki Amemiya,et al.  Numerical modelings of superconducting wires for AC loss calculations , 1998 .

[26]  Sonja I. Schlachter,et al.  Electro-mechanical analysis of Roebel cables with different geometries , 2012 .

[27]  S. Fukui,et al.  Transport Current AC Losses of High-Tc Superconducting Tapes Exposed to AC Magnetic Field , 1998 .

[28]  K. Tanabe,et al.  Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides , 2015, Science and technology of advanced materials.

[29]  W. Goldacker,et al.  AC Losses of Pancake Coils Made of Roebel Cable , 2013, IEEE Transactions on Applied Superconductivity.

[30]  R. Badcock,et al.  Transport AC loss characteristics of a nine strand YBCO Roebel cable , 2010 .

[31]  Francesco Grilli,et al.  Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils , 2011, 1109.2747.

[32]  Hiroyuki Ohsaki,et al.  Numerical analysis of AC losses in YBCO coated conductor in external magnetic field , 2004 .

[33]  Katsutoku Takeuchi,et al.  Model for electromagnetic field analysis of superconducting power transmission cable comprising spiraled coated conductors , 2011 .

[34]  J. Hänisch,et al.  Measurement of the transverse Jc profiles of coated conductors using a magnetic knife of permanent magnets , 2008 .

[35]  N. Amemiya,et al.  Experimental determination of two-dimensional critical current density distribution in YBCO coated conductors , 2001 .

[36]  Rodney A. Badcock,et al.  The dependence of AC loss characteristics on the spacing between strands in YBCO Roebel cables , 2011 .