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| Measurement of Arc Velocity in An Arc-Rotating Pulsed Power Switch Based on B-dot Probes |
| Guo Rui, He Junjia, Zhao Chun, Chen Lixue, Pan Yuan |
| Key laboratory of Fusion and Advanced Electromagnetic Technology, Ministry of Education Huazhong University of Science and Technology Wuhan 430074 China |
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Abstract The B-dot probes are installed in an arc-rotating pulsed power switch to measure the arc velocity in air at atmospheric pressure. B-dot probe is a small sensing coil based on Faraday’s law. Its voltage varies with the distance from the arc to probe. Six probes are set uniformly in a circle to obtain the arc velocity variation with the current. The probes are set under the gap and their axial are parallel to the arc moving direction. The zero-crossing point of probe voltage signal is considered as the time when the arc passing the probe. A power supply system consistes several independent modules discharging in sequence provided a trapezoidal pulse of current on the switch. The arc velocity variation of the current is obtained by calculating the probe signal. The arc rotates at about 550m/s when the current is 20kA.
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Received: 10 September 2008
Published: 04 March 2014
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[1] Prem K C, Pramanik A. Analytical estimation of magnetic field and arc velocities in a Walkie Edgar spark gap device[J]. IEEE Transactions on Magnetics, 1995, 31(1): 837-843.
[2] Jaitly N C, White R, Cassany B, et al. Long life rotating arc gap coaxial switch for MEGA-AMP, Kilo-Coulomb, high action switching of multi-MJ capacitor banks[C]. Pulsed Power Conference, 2005: 643-646.
[3] 王清玲, 郭良富, 何孟兵, 等. 轴向磁场控制的旋转电弧开关的研制[J]. 中国电机工程学报, 2006, 26(3): 102-105.
[4] Dullin E. Motion of high current arcs on spiral-type contacts[J]. IEEE Transactions on Plasma Science, 1989, 17(5): 875-879.
[5] Cho C H, Rim G H, Lee H S, et al. Experimental analysis of rotating arc behaviors in a rotary arc gap switch for a 500kJ capacitor bank[J]. IEEE Transactions on Magnetics, 2001, 37(1): 358-361.
[6] Li Xingwen, Chen Degui, Wu Yi, et al. A comparison of the effect of different mixture plasma properties on arc motion[J]. J. Phys. D: Appl. Phys., 2007, 40: 6982-6988.
[7] Szente R N, Munz R J, Drouet M G. The influence of the cathode surface on the movement of magnetically driven electric arcs[J]. J. Phys. D: Appl. Phys., 1990, 23: 1193-1200.
[8] Seo K S, Lee T H, Hwang L H, et al. A high power vacuum rotary arc gap closing switch for pulsed power applications[C].Twenty-Fifth International Power Modulator Symposium, 2002: 366-369.
[9] Roychowdhury P, Vijayan T, Iyengar S T. Spatial and temporal characteristics of a vacuum-arc rail-gun plasma[J]. Journal of Applied Physics, 1997, 82(4): 1539-1545.
[10] Vijayan T, Roychowdhury P, Venkatramani N. Probe characterization of high-current driven metal plasma in a vacuum-arc rail gun[J]. Journal of Applied Physics, 2004, 96(8): 4084-4093.
[11] Essiptchouk A M, Marotta A, Sharakhovshy L I. The effect of arc velocity on cold electrode erosion[J]. Physics of Plasmas, 2004, 11(3): 1214-1219. |
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2010, Vol. 25 
