高温超导带材的失超传播特性研究

对Bi-2223／Ag高温超导多芯带材在失超传播过程中的电压特性和温度特性进行了研究。测量了在液氮保护冷气氛(77K)环境下，零背景磁场时Bi-2223／Ag超导多芯带的纵向失超传播速度与传输电流的关系，并得到最小传播电流。同时采用有限元方法(finite elment method，简称。FEM)模拟出超导体失超传播过程中由超导态过渡到正常态的温度变化行为。另外，比较了在相同传输电流、不同猝灭(失超)能量下的失超传播特性。这对高温超导体磁体及电力系统中的应用有着重要的实际意义。

STUDY ON QUENCH PROPAGATION PROPERTIES OF HIGH-TEMPERATURE SUPERCONDUCTING TAPE

The voltage and temperature properties corresponding to quench propagation process of Bi-2223/Ag high temperature superconducting multifilament tapes have been studied in this paper. The transport current dependence of longitudinal-direction quench propagation velocities has been measured under the cooling condition of Nitrogen atmosphere (77K) and in a zero background magnetic field. The minimum propagation current has also been derived. The temperature transition behaviors from superconducting-state to normal-state in quench propagation process have been simulated through the finite element method (FEM) with the results coincident with measured results. In addition, the quench propagation properties are compared under the conditions of the same transport current and different quench energy. These results are significant to the applications of high temperature superconducting magnets and electric power systems.