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HTS Transformer and Its Related Loss Measurement and quench protection Techniques

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HTS Transformer and Its Related Loss Measurement and Quench ...

quench detection and protection system design and analysis of the 7 T superconducting magnet

第二十七届中国控制会议

作者： Jin Jianxun 1,Chen Xiaoyuan 1,Guo Youguang 2,Zhan Yuedong 2,3,Zhu Jianguo 2 1.Center of Applied Superconductivity and Electrical Engineering,University of Electronic Science and Technology of China,Chengdu610054,P.R.China 2.Faculty of Engineering,University of Technology,Sydney,NSW 2007,Australia 3.Kunming University of Science and Technology,Kunming,150001,P.R.China

Recently research and development concerning applications of high temperature superconducting（HTS） transformers have been progressed actively in the *** the HTS rated current capability,it is also essential to develop the relevant and precise performance test and protection systems for HTS *** paper mainly presents elementary test and protection methods of HTS transformers including AC loss measurement,and quench detection and protection.A new integrated measurement system for HTS transformers is also proposed by using the Labview virtual instrument software.

关键词： High Temperature Superconductor (HTS) HTS Transformer AC Loss quench protection Labview

来源： cnki会议评论

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Chinese Physics C 2010年第4期34卷 492-495页

作者：龙风施毅刘方倪志鹏 Institute of Plasma Physics Chinese Academy of Sciences

A NbTi 7 T superconducting magnet with a 338 mm bore system was rebuilt and the first experiment was carried out in Jan. 2009. The balancing-bridge method used for the quench detection system is analyzed and an improvement of the principle of balancing-bridge conformation is given. The inductances of the coils axe calculated to estimate the proportion of the bridge arms. The appropriate parameters axe selected for the balancing-bridge.

关键词： quench detection quench protection balancing-bridge

Neutron irradiation influence on high-power thyristor device under fusion environment

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Nuclear Science and Techniques 2024年第4期35卷 65-81页

作者： Wei Tong Hua Li Meng Xu Zhi-Quan Song Bo Chen School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China

Because of their economy and applicability,high-power thyristor devices are widely used in the power supply systems for large fusion *** high-dose neutrons produced by deuterium–tritium(D–T)fusion reactions are irradiated on a thyristor device for a long time,the electrical characteristics of the device change,which may eventually cause irreversible *** this study,with the thyristor switch of the commutation circuit in the quench protection system(QPS)of a fusion device as the study object,the relationship between the internal physical structure and external electrical parameters of the irradiated thyristor is ***,a series of targeted thyristor physical simulations and neutron irradiation experiments are conducted to verify the accuracy of the theoretical *** addition,the effect of irradiated thyristor electrical characteristic changes on the entire QPS is studied by accurate simulation,providing valuable guidelines for the maintenance and renovation of the QPS.

关键词： Fusion device Neutron irradiation effects Thyristor quench protection

Study on a Highly Stabilized Power Supply for Hybrid-Magnet Superconducting Outsert

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Plasma Science and Technology 2014年第9期16卷 890-896页

作者：吴景林龙佼佼刘小宁 University of Science and Technology of China High Magnetic Field Laboratory Chinese Academy of Sciences

The superconducting outsert of the 40 T hybrid-magnet in High Magnetic Field Laboratory （HMFL） of Chinese Academy of Sciences （CAS） requires a highly stabilized power supply. In this paper, two kinds of power supply design are briefly presented and both advantages and disadvantages are analyzed. In order to overcome the drawbacks of switching power supply, a series regulated active filter is adopted and a new design is proposed which ensures cooperative relationship between the feedback control loops of the switching converter and the series regulated active filter. Besides, unlike the traditional switching power supply, which can generate positive voltage only, this new design can also generate negative voltage which is needed in the quench protection for the superconducting magnet. In order to demonstrate the effectiveness of the methodology, a low-power prototype has been accomplished. The simulation and experiment results show that the power supply achieves high precision under the combined action of two feedback control loops. The peak-to-peak amplitude of the output ripple voltage of the prototype is 0.063%, while the peak-to-peak amplitude of the output ripple current is 120 ppm.

关键词： superconducting magnet switching power supply series regulating feedbackcontrol quench protection

Superconducting multipole wiggler with large magnetic gap for HEPS-TF

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Nuclear Science and Techniques 2022年第2期33卷 21-29页

作者： Xian-Jing Sun Fu-San Chen Xiang-Chen Yang Wan Chen Xiao-Juan Bian Min-Xian Li Rui Ge Miao-Fu Xu Yao Gao Jin-Can Wang Hui-Hua Lu Jian-She Cao Zhi-Qiang Li Zhuo Zhang Rui Ye Xiang-Zhen Zhang Shuai Li Bao-Gui Yin Mei Yang Ling-Ling Gong Da-Heng Ji Lin Bian Ran Liang Ya-Jun Sun Hong Shi Institute of High Energy Physics Chinese Academy of SciencesBeijing 10049China Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China China Spallation Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan 523803China

A 16-pole superconducting multipole wiggler with a large gap of 68 mm was designed and fabricated to serve as a multipole wiggler for *** wiggler consists of 16 pairs of NbTi superconducting coils with a period length of 170 mm,and its maximum peak field is 2.6 *** magnet design,magnet poles were ***,the Lorentz force on the coils and electromagnetic force between the upper and lower halves were computed and analyzed along with the stored energy and inductance at different *** enhance the critical current of the magnet coil,all the pole coils selected for the magnet exhibited excellent performance,and appropriate prestress derived from the coil force analysis was applied to the pole coils during magnet *** entire magnet structure was immersed in 4.2-K liquid helium in the cryostat cooled solely by four two-stage cryocoolers,and the performance test of the superconducting wiggler was appropriately *** on the measured results,the first and second field integrals on the axis of the superconducting wiggler were significantly improved at different field levels after the compensation of the corrector ***,the wiggler was successfully installed in the storage ring of BEPCII operation with beams.

关键词： Superconducting multipole wiggler Force analysis quench protection Magnetic field measurement HEPS-TF Cryostat

Development of 5 T NbTi Superconducting Magnet with 160 mm Warm Bore for Magnetic Separation

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Plasma Science and Technology 2008年第5期10卷 629-634页

作者：施毅武玉李少磊 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

A wide-bore 5 T NbTi superconducting magnet, for magnetic separator, with an operational current of 106 A is designed and fabricated. This magnet with a Ф60 mm roomtemperature bore is installed in a vacuum cryostat and immersed in liquid helium. A two-stage 4 K Gifford-McMahon （GM） cryocooler is used to maintain the cooling shield at 70 K and the condenser at 4 K in order to achieve the zero vaporization loss of liquid helium. The cooling power of the GM cryocooler is 1.5 W. In this paper, the design, heat leakage, stress analysis, quench protection characteristics and preliminary test results are presented.

关键词： superconducting magnet zero vaporization loss stress analysis quench protection