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Method with reliable accuracy and fast speed for measuring operational current of HTS NI closed-loop coils in steady persistent-current-mode

引用

Superconductivity 2024年第1期9卷 65-73页

作者： Li Lu Wei Wu Xin Yu Zhuoyan Zhong Kai Li Chengyun Pan Mengzhu Li Zhijian Jin School of Electrical Engineering and Electronic Information Shanghai Jiao Tong UniversityMinghang District200240 ShanghaiPR China Shanghai Superconductor Technology Co. Ltd.Pudong New District201203 ShanghaiPR China CRRC Changchun Railway Vehicles Co. Ltd.Changchun 130062JilinPR China

This study proposes a method for measuring the operational current of high temperature superconducting(HTS)non‐insulation(NI)closed‐loop coils,which operate in the steady persistent‐current‐mode(PCM).HTS NI closed‐loop coils are promising for many easily‐quenching direct‐current(DC)applications,where their performance is determined by magnetomotive forces,total number of turns,and *** the primary interface parameter in an application system,the operational current must be accurately and rapidly ***,this is achieved by dividing the measured magnetic field by the coil ***,even if the influence of the screening current induced field(SCIF)is not considered,existing methods for the coil constant may be disturbed by the performance and location of Hall sensors,or experience a long measuring ***,a relatively accurate and fast method is proposed in this study,which is based on adjusting the output current of the adjustable power supply and monitoring the coil voltage as an *** proposed method was validated through experiments and simulations using an equivalent circuit model coupled with a finite element method(FEM)model,and its current accuracy can be equivalent to the resolution of the employed power *** was demonstrated that this method reduced the requirements for Hall sensor’s performance and location,and has a more reliable accuracy in contrast to the simulation *** to the experimentally conventional method,the proposed method presents a significantly faster *** impact of the SCIF was considered and proven to be negligible for the tested pancake *** for coils whose coil constant vibrates owing to the SCIF,this method can be adapted to directly measure various operational ***,it was demonstrated that the measurement error can be influenced by the current discrepancy among turns when the coil is not in the steady PCM,and a procedure for reducing this error was pr

关键词： Operational current HTS NI closed‐loop coils Measurement method Adjustable power supply coil voltage

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