基于FBG的直流高温超导电缆失超检测

Quench detection of DC HTS cable by using FBG

高温超导电缆输电具有损耗小、传输密度高、无电磁污染等特点,越来越受到各国的重视。但是当超导电缆发生失超故障时,产生的焦耳热会影响电缆的绝缘,使电缆无法正常运行。快速准确的失超检测就显得尤为重要。设计制作了一条高温超导电缆的模型,并搭建了高温超导电缆的测温与保护平台,采用光纤光栅测温对其失超之后铜骨架的温度变化进行测量,结合理论分析与仿真计算,论证了光纤光栅能满足对于高温超导电缆失超检测的要求。该方法具有反应速度快、结构简单的特点,可用于检测采用Triaxial结构和实心骨架的高压交直流超导电缆失超故障,为高温超导电缆的失超检测技术的实际应用提供了参考依据。

High temperature superconducting （HTS） cables have internationally received more and more attention due to the advantages of low losses, high transmission density, non - electromagnetic pollution, and environment - friendly operation. How- ever, the Joule heat generated in former and HTS tapes will influence the insulation and even result in abnormal operation after HTS cable has quenched. It is especially.essential for designer and user to carry out rapid and accurate quench detection. In this paper, a model HTS cable was designed and prepared, and was established a temperature measurement and protection platform for HTS model cable. Temperature measuring method by using a Fiber Bragg grating （FBG） was adopted to obtain the tempera- ture rise of its copper former after quench. It demonstrates that FBG is effective on quench detection of HTS cables according to a combination of theoretical analysis and simulation. This measurement method of temperature rise has fast response speed and simple structure. It can be used to detect quench of high -voltage DC or AC HTS cable with Triaxial structure and solid former, and provides a reference basis for actual application of quench detection technology for HTS cable.