Charge accumulation phenomenon on gas–solid interface greatly restricts the development of HVDC energy transmission system. In this study, the surface charge transport behavior and flashover performance on alumina/epoxy spacer coated by SiC/epoxy composites are experimentally investigated under DC stress. SiC/epoxy composites with varied SiC particle size are fabricated and deposited on spacer surface. Nearly a charge free surface is achieved especially at smaller SiC particle size, even when metallic wires are adhered on spacer surface and connected to high voltage electrode. The DC flashover voltage increases with the decrease of SiC particle size. On the one hand, smaller SiC particle size exhibits more outstanding nonlinear conductivity characteristics, contributing to accelerating charge dissipation, whereas on the other hand, it would introduce plenty of shallow traps due to the increased interfacial regions between SiC particle and epoxy matrix, resulting in aggravating c...

中文翻译：

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SiC粒径不同的SiC /环氧树脂复合材料包覆的氧化铝/环氧间隔物上的表面电荷传输行为和飞弧机理

气固界面上的电荷积累现象极大地限制了高压直流输电系统的发展。在这项研究中，在直流应力下，通过实验研究了SiC /环氧树脂复合材料涂覆的氧化铝/环氧树脂垫片上的表面电荷传输行为和飞弧性能。制备了具有不同SiC粒度的SiC /环氧树脂复合材料，并将其沉积在垫片表面上。即使将金属线粘附在垫片表面并连接至高压电极，尤其是在SiC粒径较小的情况下，也几乎可以获得无电荷的表面。直流闪络电压随SiC颗粒尺寸的减小而增加。一方面，较小的SiC颗粒具有更出色的非线性电导特性，有助于加速电荷耗散，而另一方面，