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火花放电喷射等离子体触发气体开关导通特性及工作模式分析

DOI: 10.13336/j.1003-6520.hve.2015.06.008, PP. 1830-1836

Keywords: 气体开关,火花放电喷射等离子体,工作系数,时延,工作模式,导通特性

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Abstract:

为理解喷射等离子体触发气体开关的导通过程和触发机理,利用高速分幅相机拍摄火花放电喷射等离子体触发气体开关的导通过程,结合开关导通时延测量,研究了该开关在10%~90%工作系数下的触发导通特性,分析了开关在高、低工作系数下的导通过程和工作模式。结果表明,火花放电喷射等离子体触发气体开关在10%~90%的极宽工作系数范围内能可靠触发导通,导通时延随工作系数提高而逐步从数十μs减小至数百ns。低工作系数时气体开关为慢导通模式,导通过程可分为喷射等离子体形成阶段、喷射等离子体快速发展阶段、喷射等离子体发展饱和阶段和主间隙放电4个阶段,其导通延时受工作系数和触发脉冲幅值的影响,为数μs至数十μs。随着开关工作系数提高,开关由慢导通模式逐步过渡到快导通模式,导通过程只包括喷射等离子体形成阶段和主间隙放电两个阶段,放电发展过程较为迅速,导通时延约为数百ns。

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