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首页> 外文会议>IEEE International Conference on High Voltage Engineering and Application >Surface Charge Distribution Measurement before and after DC Flashover: A Novel Insight to the Influence of Surface Charge on Flashover Voltage
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Surface Charge Distribution Measurement before and after DC Flashover: A Novel Insight to the Influence of Surface Charge on Flashover Voltage

机译：直流闪络之前和之后的表面电荷分布测量：对表面电荷对闪络电压影响的新颖见解

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In this paper, epoxy resin as well as its nanocomposites with Al2O3 as the filler has been employed as the filler has been employed as test sample to investigate the surface charge distribution features before and after DC flashover. Electrical charges were introduced on sample surface by means of a pair of finger-shaped electrodes which were stressed with DC voltage superimposed by repetitive pulses. DC flashover test was then carried out to examine the influence of surface charge on flashover voltage. Both charge distribution before and after the flashover was measured. It was found that the presence of surface charge reduced the DC flashover voltage. Maximum charge density on the surface after flashover was even higher than that before flashover. It is proposed that although charges were pre-deposited by the superimposed voltage, the voltage rising period of DC flashover test certainly introduced more charges onto the sample surface, which may has much serious influence on the flashover phenomena. Surface charge distribution just prior to flashover should be measured in the future to further understand the surface charge effect on DC flashover of polymer insulating materials.
机译：在本文中，环氧树脂及其与铝形成的纳米复合材料 2 Ø 3 因为已经使用了填料，所以已经将填料用作测试样品，以研究直流闪络之前和之后的表面电荷分布特征。借助于一对指状电极将电荷引入样品表面，该指状电极被叠加有重复脉冲的DC电压施加应力。然后进行直流闪络测试，以检查表面电荷对闪络电压的影响。测量了闪络之前和之后的电荷分布。发现表面电荷的存在降低了直流闪络电压。闪络后的表面最大电荷密度甚至高于闪络前的表面。有人提出，尽管电荷是由叠加电压预先沉积的，但直流闪络测试的电压上升周期肯定会在样品表面上引入更多的电荷，这可能会对闪络现象产生严重影响。将来应该测量闪络之前的表面电荷分布，以进一步了解表面电荷对聚合物绝缘材料直流闪络的影响。

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