Inrush-current-limiting with high T/sub c/ Superconductor

We propose an inrush-current-limiting element as a new application of high-temperature superconductor (HTS). The inrush-current-limiting element is required to recover automatically to superconducting state without any current interruption after the current limiting operation. The limiting element proposed suppresses the inrush current using the flux-flow resistance generated in the HTS. Since the flux-flow resistance is small as to be neglected when the instantaneous value of the current in the HTS is below its critical-current, the limiting element may satisfy the above requirement for the inrush-current-limitation. To verify the performance of the inrush-current-limiting element, we performed the current-limiting tests by a limiting element made of bulk Bi2223. As a result, it was confirmed that the limiting element suppressed the magnetizing inrush current of a transformer and self-recovered to superconducting state.

[1]  S. Nomura,et al.  Development of 66 kV/750 A High-T/sub c/ superconducting fault current limiter magnet , 2004, IEEE Transactions on Applied Superconductivity.

[2]  Y. Yokomizu,et al.  Comparison of fundamental performance of different type of fault current limiters with two air core coils , 2004, IEEE Transactions on Applied Superconductivity.

[3]  Toshiro Matsumura,et al.  A study on required volume of superconducting element for flux flow resistance type fault current limiter , 2003 .

[4]  Toshiro Matsumura,et al.  Relation between critical current density and flux flow resistivity in Bi2223 bulk element for fault current limiter , 2003 .

[5]  Toshiro Matsumura,et al.  Proposal of flux flow resistance type fault current limiter using Bi2223 high T/sub c/ superconducting bulk , 2002 .

[6]  Martin Lakner,et al.  6.4 MVA resitive fault current limiter based on Bi-2212 superconductor , 2002 .

[7]  P. Haldar,et al.  Design and development of a 15 kV, 20 kA HTS fault current limiter , 2000, IEEE Transactions on Applied Superconductivity.

[8]  Lembit Salasoo,et al.  Superconducting Fault Current Limiters , 1999 .

[9]  H. Kubota,et al.  A new model of fault current limiter using YBCO thin film , 1999, IEEE Transactions on Applied Superconductivity.

[10]  Jakob Rhyner,et al.  Test of 1.2 MVA high- superconducting fault current limiter , 1997 .

[11]  E. Leung,et al.  Surge protection for power grids , 1997 .

[12]  T. Uchii,et al.  Development of flux-lock-type fault current limiter with high-T/sub c/ superconducting element , 1997, IEEE Transactions on Applied Superconductivity.

[13]  H.-W. Neumuller,et al.  Resistive current limiters with YBCO films , 1997, IEEE Transactions on Applied Superconductivity.

[14]  H. Kado,et al.  Performance of a high-Tc superconducting fault current limiter-design of a 6.6 kV magnetic shielding type superconducting fault current limiter , 1997, IEEE Transactions on Applied Superconductivity.

[15]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.