高温超导磁体的一种失超判别方法

One approach to quench decision of a high temperature superconductor(HTS) magnet

高温超导同步电动机转子上的Bi2223/Ag带高温超导磁体,其结构特殊,且工作在旋转状态,必然给其失超信号的检测提出新的问题。试验表明,为快速、准确检测到失超信号,仅用经验失超判据Ec=1μV/cm是不够的。为此,通过对试验数据的分析提出dv/dt失超判别方法。此方法从磁体的电压-电流特性入手,根据每个励磁阶段的电压变化情况,设置相应的电压变化率的阈值。

The high temperature superconductor（HTS） magnet was made of Bi2223/Ag tape, situated on the rotor of HTS synchronous motor and rotates at active state, new challenges must be put forward for quench detection. The experiments showed that for detecting quench quickly and accurately the empirical criterion Ec = 1 μN/cm was not enough. One quench decision approach dv/dt was presented through analyzing experimental data. Based on the voltage-ampere characteristics of the HTS magnet, this method sets corresponding threshold values of change rate of voltage according to cases of voltage change for every excitation stage.