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微空腔交流放电的光学观测与模型

DOI: 10.13336/j.1003-6520.hve.2015.09.033, PP. 3061-3065

Keywords: 局部放电,气泡放电,光学图像,微焦,平板气泡模型,弧面气泡模型

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Abstract:

气泡放电是绝缘领域中的一个重要局部放电现象,大部分研究都从放电的电流信号、特高频电磁波信号等方面进行研究,由于气泡微小尺寸的限制,并没有对放电光学图像进行直接的观察;相关理论模型也都假设放电起始于气泡一端。本论文采用半通孔空穴加工方式在有机玻璃中制作了直径3mm的微空腔来模拟气泡放电,利用微焦镜头,拍摄了不同焦点位置的放电图像,识别了放电位置和形状。结果表明放电起始位置不一定在微空腔底部和顶部,而可能在微空腔内壁不光滑的位置;放电路径不一定直接走气隙,而是沿内壁表面;在电压有效值较高时,放电电流信号相位相对集中且没有过零现象。为了克服平板气泡模型的缺陷,提出了更接近物理状况的弧面气泡模型对电流信号不过零现象进行了解释。

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