Reconstruction of current unbalance in full-size ITER NbTiCICC by self-field measurements

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Ilyin, Yu. A. and Nijhuis, A. and Kate, H.H.J. ten and Bruzzone, P. and Stepanov, B. (2005) Reconstruction of current unbalance in full-size ITER NbTiCICC by self-field measurements. IEEE Transactions on Applied Superconductivity, 15 (2). pp. 1391-1394. ISSN 1051-8223

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Abstract:Methods have been developed to study the distribution of the transport current among the strand bundles of cable-in-conduit conductors (CICC) by using self-field measurements with Hall probe arrays. The unbalance in the transport current is mainly caused by the unavoidable nonuniformity of the joints and can be a reason for a change in the voltage-temperature characteristic and consequently of the temperature margin. In the present study we focus on the reconstruction of the current unbalance in a full size NbTi CICC tested in the SULTAN test facility. The crucial point in the reconstruction procedure is the proper choice of the reference self-field profile corresponding to a uniform current distribution. To achieve this uniform distribution, the conductors were driven far into the current sharing regime. The self-field profile corresponding to the highest achieved voltage level was taken as a reference. This assumption is supported by the modeling of current-sharing runs in the CUDI-CICC network model. Furthermore, local redistribution effects were observed in the conductors at high currents. The current transfer associated with this redistribution is analyzed as well.
Item Type:Article
Copyright:©2004 IEEE
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/54167
Official URL:http://dx.doi.org/10.1109/TASC.2005.849098
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