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发表时间：2013-01-01

发表刊物：真空科学与技术学报

所属单位：电子信息与电气工程学部

期号：9

页面范围：871-876

ISSN号：1672-7126

摘要：The time evolution of the arc-discharge image in the vacuum circuit breaker (VCB) was characterized with the complementary metal oxide semiconductor camera of the lab-built measurement setup. The digitized images were processed and analyzed. The results show that the arc discharge image goes through three distinctive stages: i) The initial stage, where the arc in the aggregation state, and its images resemble the bridge-column arc, diffusion-column arc, and contracting-column arc; moreover, the bright arc often ablates seriously the contacts; ii) The intermediate stage, where the increasing pressure inside the arc column turns the aggregation state into the diffusion state, including subsonic and supersonic diffusions, accompanied with fading arc intensity and reducing contact ablation; iii) The quenching stage, where the decreasing current and increasing gap length quench the arc eventually. The time evolution of the arc intensity in the diffusion stage was simulated with the magneto-hydrodynamic model. The simulated results were found to agree reasonably well with the digitized arc images.

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