Operational characteristics of a flux-lock-type high-T/sub c/ superconducting fault current limiter with a tap changer

The authors investigate the operational characteristics of a flux-lock-type high-T/sub c/ superconducting (HTSC) fault current limiter (SFCL) with a tap changer which could adjust the number of turns of the third winding. In the case of conventional flux-lock-type SFCL, the phase adjusting capacitor is connected in series with magnetic field coil to adjust the magnetic field applied to the HTSC element in phase with the current flowing through the HTSC element during a fault time. However, the current flowing at the third winding, which is connected with magnetic field coil, affects the fault current limiting characteristics. To analyze the influence of current flowing at the third winding on the fault current limiting characteristics, the fault current limiting characteristics of the flux-lock type SFCL, whose inductance of coil 3 could be adjustable through a tap changer, are investigated through the experiments and the computer-aided simulations. The relation of line currents flowing into the flux-lock-type SFCL during a fault time and numbers of turns of a tap changer is drawn.

[1]  Hyo-Sang Choi,et al.  Operating properties of superconducting fault current limiters based on YBCO thin films , 2001 .

[2]  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.

[3]  C. Grantham,et al.  Electrical application of high T/sub c/ superconducting saturable magnetic core fault current limiter , 1997, IEEE Transactions on Applied Superconductivity.

[4]  O. Hyun,et al.  Initial quench development in uniform Au/Y-Ba-Cu-O thin films [superconducting fault current limiters] , 2001 .

[5]  J. E. Beehler,et al.  Current Limiting Device - A Utility's Need , 1974 .

[6]  Hyo-Sang Choi,et al.  Quench characteristics of resistive superconducting fault current limiters based on YBa2Cu3O7 films , 2001 .

[7]  L. Salasoo,et al.  Comparison of superconducting fault limiter concepts in electric utility applications , 1995, IEEE Transactions on Applied Superconductivity.

[8]  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.

[9]  S. Fukui,et al.  Performance of DC reactor type fault current limiter using high temperature superconducting coil , 1999, IEEE Transactions on Applied Superconductivity.

[10]  Wolfgang Schmidt,et al.  Resistive fault current limiters with YBCO films 100 kVA functional model , 1999, IEEE transactions on applied superconductivity.

[11]  Hyo-Sang Choi,et al.  Quench properties of Y-Ba-Cu-O films after overpowering quenches [superconducting fault current limiters] , 2001 .

[12]  Switching properties of a hybrid type superconducting fault current limiter using YBCO stripes , 2002 .

[13]  Tomonori Watanabe,et al.  Fabrication of NdGaO/sub 3/ buffer layer on textured Ni tape for long length coated conductors , 2001 .

[14]  Martin N. Wilson,et al.  Superconducting Magnets , 1984 .

[15]  Hyo-Sang Choi,et al.  Quench distribution in superconducting fault current limiters at various voltages H.-R. Kim, H.-S. Choi, , 2001 .