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Optical fibre sensing for fast hotspot detection in SFCLs
Superconductor Science and Technology ( IF 3.6 ) Pub Date : 2020-09-18 , DOI: 10.1088/1361-6668/abb200
Arooj Akbar 1 , Zhisheng Yang 2 , Sheng Wang 2, 3 , Luc Thvenaz 2 , Bertrand Dutoit 1
Affiliation  

The health monitoring of superconducting fault current limiters (SFCL) is important for their large-scale exploitation in HVDC grids protection. The intrinsic non-homogeneity of critical current along the superconductor length can cause localized points of heating, called hotspots, in the SFCL device which can lead to device damage. In this paper we propose to use an extremely simple and cost-effective technique based on all-fibre Mach-Zehnder interferometers for hotspot detection in SFCLs, where the measurement arm of the interferometer is integrated with the SFCL and the reference arm remains in ambient. The system only consists of a laser, two optical fibre couplers and a photo detector. By studying the acquired interference patterns, even singular hotspots within the entire conductor length, can be informed in few milli-seconds, which is the fastest and most sensitive demonstration to the best of our knowledge that meets the SFCL requirement for fast hotspot detection.

中文翻译:

光纤感应可快速检测SFCL中的热点

超导故障限流器(SFCL)的运行状况监视对于HVDC电网保护中的大规模开发至关重要。沿超导体长度的临界电流的固有非均质性会导致SFCL器件中的局部加热点(称为热点),从而导致器件损坏。在本文中,我们建议使用一种基于全光纤Mach-Zehnder干涉仪的极其简单且经济高效的技术来检测SFCL中的热点,其中干涉仪的测量臂与SFCL集成在一起,而参考臂则保持在环境中。该系统仅由一个激光器,两个光纤耦合器和一个光电探测器组成。通过研究获得的干扰模式,甚至可以在几毫秒内得知整个导体长度内的奇异热点,
更新日期:2020-09-20
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