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第一届电工产品可靠性与电接触国际会议

作者： JiaoMin.Liu Xinfu Li Xiaoying Zhao Hebei University of Technology Tianjin 300130 China ~2College of Mathematics and Computer Science Hebei University Baoding 071002 China

＜正＞ In order to study arc column feature, high-speed image recording technology was used to capture arc image. But contacts and chamber can’t be observed due to the arc radiation and contacts reflection. A wavelet based approach for weak contacts feature in the arc image was proposed. arc image was decomposed by using wavelet, then the weak wavelet coefficients were amplified by using nonlinear mapping method, enhancement image was reconstructed by an inverse wavelet transform. To achieve a better visual effect, different coefficient amplifying gain was used at each level. The experiment results show that the proposed method avoids over-enhancement of noise while enhancing weak contacts feature with good visual effect.

关键词： Index Terms—Image enhancement Non-linear mapping switching arc Wavelet transform

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New method for capturing arc of moving on switching apparatus

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 469-474页

作者： LIU Jiao-min WANG Jing-hong Institute of lntelleetual Eleetric Apparatus Hebei University of Technology Tianjin 300130 China Information Technology College Hebei Normal University Shijiazhuang 050091 China

The switching arc that occurs in contact gap when contact of low voltage apparatus closes or breaks in electric circuit is harmful to the contacts, insulation, and reliability of electrical gear because of its very high temperature. As arcing time is very short in switching gear, it is very difficult to observe arc phenomena directly for researchers. Therefore, visualization of switching arc is important for understanding arc phenomena, to analyze the arc features, and to improve the design and reliability of switching gear. Based on analyzing the visualization methods proposed by researchers, a new switching arc capturing approach is introduced in this paper. arc image acquisition, and image processing techniques were studied. A switching arc image acquisition and visual simulation software based on high speed CCD camera hard ware system was designed and implemented to yield en- hanced arc image with good visual effect.

关键词： Low voltage apparatus switching arc Image acquisition Visual simulation

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