## 抄録

Superconducting wires with a CuNi matrix for a.c. applications are not fully stabilized and normal transition is easily induced by various disturbances because the CuNi matrix has a high electrical resistivity and a very low thermal conductivity. We have investigated normal-zone propagation velocities in NbTi/CuNi superconducting wires[l]. In a.c. applications of superconductivity we also need to know the thermal and the electromagnetic behaviour during such the abrupt increase of currents as short-circuit current in superconducting transformers, the current changing in superconducting current limiters and the current redistribution during quench process in multi-strand cables. We measured the degradation of the quench current of NbTi superconducting wires with a CuNi matrix as a function of the current sweep rate in the range of 10 A/s to 100 kA/s and the initial current, which is a transport current-just before current changing. Experimental data is compared with analytical results by the finite element method taking the magnetic and the thermal diffusion in radial direction of wire cross-section into account. From these comparisons, the relation between the rate of current changing and the degradation of the quench current in superconducting wires is discussed.

本文言語 | English |
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ページ（範囲） | 503-506 |

ページ数 | 4 |

ジャーナル | IEEE Transactions on Applied Superconductivity |

巻 | 3 |

号 | 1 |

DOI | |

出版ステータス | Published - 1993 3月 |

## ASJC Scopus subject areas

- 電子材料、光学材料、および磁性材料
- 凝縮系物理学
- 電子工学および電気工学