分布式光纤高温超导电流引线失超检测技术

Quench detection technology of HTS current leads using distributed optical fibers

高温超导(HTS)电流引线是大型超导磁体的重要组成部分,通常使用Bi-2223超导带制作而成。高温超导材料具有失超传播速度慢和失超电压微弱的特点,这对失超检测设计提出很大的挑战。使用分布式光纤作为传感器,设计并制作了光纤封装件,在液氮环境下开展失超模拟实验。实验结果表明:使用分布式光纤能够探测电流引线上的温度分布,实现快速的失超检测及热点定位。

High temperature superconductor(HTS) current lead is an important part of large superconducting magnet, which is usually made of Bi-2223 superconducting tapes. It has the characteristics of slow normal zone propagation velocity and weak quench voltage, which is a great challenge to the design of quench detection. In this paper, the distributed optical fiber was used as the sensor, the optical fiber package was designed and manufactured, and then the quench simulation experiment was carried out in liquid nitrogen. The experimental results show that the distributed optical fiber can detect the temperature distribution on the current lead, quickly detect quench and locate hot spot.