超导带材并联结构的失超传播特性研究

Experimental study on the quench characteristic of YBCO tapes with different arranggements

失超传播速度vnzp和最小失超能量Emq是超导磁体的失超保护设计的重要参数。对由YBCO制成的单长导体、平行并联双导体和堆叠并联双导体进行实验,测试和分析了液氮温度下三种不同结构样品的失超传播速度和最小失超能量,监测了并联结构受到局部热干扰时的带材分流情况,及带材分流对于失超特性的影响。结果表明,分流现象导致失超传播速度降低,最小失超能量升高;通流比相同时,堆叠并联结构相比单根带材,失超传播速度约下降14%,最小失超能量约上升13%。

Normal zone propagation velocity and minimum quench energy are the important parameters for quench protection of superconducting magnets.In this research,a series of experiments were conducted on single-length conductor,parallel double conductors and stack double conductors made of YBCO high temperature superconducting(HTS)tapes at the liquid nitrogen temperature,and their normal zone propagation velocities and minimum quench energies were tested and analyzed.Also,the current sharing of the parallel structure subjected to local thermal interference was monitored,and the influence of current sharing on the quenching characteristics was analyzed.The experimental results show that the current sharing leads to a decrease in the rate of VNZP and a increase in the rate of EMQ.When the flow ratio is the same,compared with single-length conductor,the quenching propagation speed of stack double conductors decreases by about 14%,and the minimum quenching energy increases by about 13%.