Experimental study of polarity dependence in repetitive nanosecond-pulse breakdown |
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Authors: | Shao Tao Sun Guang-Sheng Yan Ping Wang Jue Yuan Wei-Qun and Zhang Shi-Chang |
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Institution: | Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100080, China |
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Abstract: | Pulsed breakdown of dry air at ambient pressure has been investigated
in the point-plane geometry, using repetitive nanosecond pulses with
10 ns risetime, 20--30 ns duration, and up to 100 kV amplitude. A
major concern in this paper is to study the dependence of breakdown
strength on the point-electrode polarity. Applied voltage, breakdown
current and repetitive stressing time are measured under the
experimental conditions of some variables including pulse voltage
peak, gap spacing and repetition rate. The results show that
increasing the E-field strength can decrease breakdown time lag,
repetitive stressing time and the number of applied pulses as
expected. However, compared with the traditional polarity dependence
it is weakened and not significant in the repetitive nanosecond-pulse
breakdown. The ambiguous polarity dependence in the experimental
study is involved with an accumulation effect of residual charges and
metastable states. Moreover, it is suggested that the reactions
associated with the detachment of negative ions and impact
deactivation of metastable species could provide a source of primary
initiating electrons for breakdown. |
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Keywords: | gas breakdown nanosecond-pulse repetition rate point-plane geometry polarity dependence |
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