Abstract
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.
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