Quench detection is very greatly significant for the safe operation of high temperature superconducting (HTS) cables. Raman-scattering based optical fiber sensing technology can be used to monitor the temperature along power cable because of the advantages of anti-electromagnetic interference, thin structure, and convenient fixing, etc. In this work, the feasibility of insulation-packaged optical fiber sensors for quench detection of a HTS cable has been studied. Firstly, three different packaged optical fibers were immersed in liquid nitrogen to test their temperature sensing performance. The test results show that the polyolefin-packaged optical fiber has good performance in low temperature, small measurement deviation, and high temperature sensitivity. Then the polyolefin-packaged optical fiber was wound on a 1 m HTS cable to measure the temperature distribution of this cable. The results show that this packaged optical fiber can sensitively detect the temperature changes along this HTS cable axial during the process of the overcurrent-induced quench and can be used in the fault location of HTS cable.

淬火检测对于高温超导（HTS）电缆的安全运行非常重要。基于拉曼散射的光纤传感技术具有抗电磁干扰，结构薄，安装方便等优点，可用于监测电缆的温度。在这项工作中，采用绝缘封装的光纤传感器的可行性已经研究了用于HTS电缆的失超检测的方法。首先，将三种不同的封装光纤浸入液氮中以测试其温度感测性能。测试结果表明，聚烯烃包装光纤在低温下性能良好，测量偏差小，对温度的敏感性高。然后将聚烯烃包装的光纤缠绕在1 m HTS电缆上，以测量该电缆的温度分布。结果表明，这种封装的光纤能够在过电流引起的失超过程中灵敏地检测沿该HTS电缆轴向的温度变化，并可以用于HTS电缆的故障定位。