Influence of current re-distribution and thermal diffusion among strands on stability of superconducting cables against local disturbances
Influence of current re-distribution and thermal diffusion among strands on stability of superconducting cables against local disturbances
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DOI：
10.1109/20.305730
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发表时间：
1994-07
影响因子：
2.1
通讯作者：
N. Amemiya;K. Ryu;T. Kikuchi;O. Tsukamoto
中科院分区：
文献类型：
--
作者：
N. Amemiya;K. Ryu;T. Kikuchi;O. Tsukamoto
多股超导电缆的淬火通常是由局部扰动引起的，该扰动在电缆的一股或几股中产生正常区域。一旦正常区产生，电流就会重新分布，因为电流通过导线之间和/或电缆两端的接触电导绕过正常区。在正常区域产生的热量也在股股之间扩散。对多股电缆在局部扰动下的稳定性进行了数值分析。研究了电流重分布和股间热扩散的影响。股线的绝缘影响电流的再分布。当输运电流较小时，去除导线的绝缘大大增加了对局部扰动的最小猝灭能量。相反，当输运电流较大时，导线的绝缘对最小猝灭能量的影响不大。在这种情况下，由于电流余量小，电流再分配不能提高稳定性。>
Quench of multi-strand superconducting cables is often initiated by a local disturbance that produces a normal zone in one or a few strands in the cable. Once the normal zone is produced, current re-distribution occurs as the current bypasses the normal zone via contact conductance between the strands and/or at the ends of the cable. Heat generated in the normal zone also diffuses between strands. A numerical analysis was performed to investigate stability property of multi-strand cables against local disturbances. The influence of the current re-distribution and thermal diffusion between strands was studied. The insulation of strands affects the current re-distribution. When the transport current is small, removing the insulation of strands substantially increases the minimum quench energy against local disturbances. On the contrary, when the transport current is large, the insulation of strands has little influence on the minimum quench energy. In this case, current re-distribution cannot improve the stability because of little current margin. >