Abstract:Aimed at the question of leakage magnetic field of air-core reactor, the corrective actions of magnetic shielding measures are taken. By installing hybrid passive magnetic shielding device, the magnetic field intensity is reduced in the aimed protected area and the health of staff and the security of equipments which working in the aimed area are protected and guaranteed. Under the excitation of sinusoidal current of certain frequency range, the analytical calculation formulas of eddy-current loss and shielding effective (SE) are solved by Poynting theorem and Maxwell equations. The finite element 3D models with different hybrid passive shielding are created to simulate the results of total eddy-current loss in shielding structure and the shielding effective of the observation point. By simulation, the electromagnetic properties of different combinations with hybrid passive shielding can be assessed and the suggestions and reference for the designers of hybrid passive magnetic shielding are provided.
鲍晓华, 张程, 胡云鹏. 空心电抗器的复合被动屏蔽结构的电磁性能分析[J]. 电工技术学报, 2016, 31(增刊): 68-75.
Bao Xiaohua, Zhang Cheng, Hu Yunpeng. Analytic Calculation of Electromagnetic Performance of Magnetic Field of Air-Core Reactor. Transactions of China Electrotechnical Society, 2016, 31(增刊): 68-75.
[1] 汪泉弟, 张艳, 李永明, 等. 干式空心电抗器周围工频磁场分布[J]. 电工技术学报, 2009, 24(1): 8-13. Wang Quandi, Zhang Yan, Li Yongming, et al. The power frequency magnetic field distribution around dry-type air-core reactor[J]. Transactions of China Electrotechnical Society, 2009, 24(1): 8-13. [2] 欧阳樟, 刘全峰, 梁艺超, 等. 干式空心电抗器工频磁场屏蔽方法的研究[J]. 电力电容器与无功补偿, 2013, 34(6): 66-73. Ouyang Zhang, Liu Quanfeng, Liang Yichao, et al. Study on power frequency magnetic field shielding method of dry air-core reactor[J]. Power Capacitor and Reactive Power Compensation, 2013, 34(6): 66-73. [3] 焦重庆, 牛帅, 李琳, 等. 复合材料工频电场和工频磁场屏蔽效能实验研究[J]. 电工技术学报, 2015, 30(10): 1-6. Jiao Chongqing, Niu Shuai, Li Lin. Experiment study of power frequency electric and magnetic shielding effectiveness for composite materials[J]. Transactions of China Electrotechnical Society, 2015, 30(10): 1-6. [4] Celozzi S, Araneo R, Lovat G. Electromagnetic Shielding[M]. Beijing: China Machine Press, 2009. [5] Schulz R, Plantz B, Brush D R. Shielding theory and practice[J]. IEEE Transactions on Electromagnetic Compatibility, 1988, 30(3): 187-201. [6] Hiles M L, Olsen R G, Holte K C, et al. Power frequency magnetic field management using a combina- tion of active and passive shielding technology[J]. IEEE Transactions on Power Delivery, 1998, 13(1): 171-179. [7] Peter Sergeant, Ugo Adriano, Luc Dupre. Passive and active electromagnetic shielding of induction heaters[J]. IEEE Transactions on Magnetics, 2004, 40(2): 675-678. [8] Kobayashi K, Kon A, Yoshizaw M, et al. Active magnetic shielding using symmetric magnetic field sensor method[J]. IEEE Transactions on Magnetics 2012, 48(11): 4554-4557. [9] 张献, 章鹏程, 杨庆新, 等. 基于有限元方法的电动汽车无线充电耦合机构的磁屏蔽设计与分析[J]. 电工技术学报, 2016, 31(1): 71-79. Zhang Xian, Zhang Pengcheng, Yang Qingxin, et al. Magnetic shielding design and analysis for wireless charging coupler of electric vehicles based on finite element method[J]. Transactions of China Electrotech- nical Society, 2016, 31(1): 71-79. [10] Keiju Yamada, Masaski Ishida, Shimeda Yutaka, et al. High-perfromance laminated thin-film shield with conductors and magnetic material multi-layered[C]// IEEE International Symposium on Electromagnetic Compatibility, Long Beach, CA, USA, 2011: 432- 437. [11] Keita Yamazaki, Kazuhiro Muramatsu, Masayuki Hirayama, et al. Optimal structure of magnetic and conductive layers of a magnetically shielded room[J]. IEEE Transactions on Magnetics, 2006, 42(10): 3524- 3526. [12] Ronald Moser J. Low-frequency low-impedance elec- tromagnetic shielding[J]. IEEE Transactions on Electro- magnetic Compatibility, 1988, 30(3): 202-210. [13] Su Y P, Liu X, Hui S Y R. Extended theory on the inductance calculation of planar spiral winding inclu- ding the effect of double-layer electromagnetic shield [J]. IEEE Transactions on Power Electronics, 2008, 23(4): 2052-2061. [14] Yanazaki K, Kato K, Fujiwara K. Effective combina- tion of magnetic and conductive layers of magnetically shielded room[J]. IEEE Transactions on Magnetics, 2000, 36(5): 3649-3651. [15] Bannister P. New theoretical expressions or predicting shielding effectiveness for the plane shield case[J]. IEEE Transactions on Electromagnetic Compatibility, 1968, 10(1): 2-7. [16] Bannister P. Further notes for predicting shielding effectiveness for the plane shield case[J]. IEEE Transac- tions on Electromagnetic Compatibility, 1969, 11(2): 50-53. [17] Sergeant P, Hectors D, Dupre L, et al. Thermal analysis of magnetic shields for induction heating[J]. IET Electric Power Applications, 2009, 3(6): 543-550. [18] 李龙女, 李岩, 井永腾, 等. 电力变压器漏磁场与杂散损耗计算的研究[J]. 电工技术学报, 2013, 28(增2): 122-127. Li Longnü, Li Yan, Jing Yongteng, et al. Research of leakage magnetic field and stray loss calculation in power transformer[J]. Transactions of China Elec- trotechnical Society, 2013, 28(S2): 122-127. [19] 鲍晓华, 方勇, 程晓巍, 等. 基于三维有限元的大型充水式潜水电机端部涡流损耗[J]. 电工技术学报, 2014, 29(7): 83-89. Bao Xiaohua, Fang Yong, Cheng Xiaowei, et al. 3-D finite element method analysis of eddy current losses in the end region of large water filling submersible motor[J]. Transactions of China Electrotechnical Society, 2014, 29(7): 83-89. [20] Woolley I. Eddy-current losses in flux shields[J]. Electrical Engineers, 1970, 117(11): 2142-2150.