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A model for charge transport around insulator under HVDC stress

机译：HVDC应力下绝缘子周围电荷传输的模型

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HVDC technology is increasingly adopted for long distance transmission of bulk power at reduced cost in comparison with HVAC systems. Epoxy is a popular material for insulators/spacers used in sealed space such as in GIS or wall bushings with selected fillers, providing excellent electrical insulation and mechanical support. Practical operation and previous research [1-5] has however suggested that insulators under HVDC stress exhibit very different long term behaviour from HVAC insulators due to charge accumulation under an electric field of single polarity. The interface between the insulator body and the surrounding gas and its immediate vicinity appears to be the most vulnerable region for the occurrence of severe discharges leading to surface flashover. There has been work on the modelling of charge transport processes [6-8] but most of them concerned applications at relatively low voltage levels, typically below 200 kV.
机译：与HVAC系统相比，HVDC技术越来越多地以较低的成本用于大功率的远距离传输。环氧树脂是用于密封空间（例如GIS或带有选定填料的墙套管）中的绝缘子/间隔物的常用材料，可提供出色的电气绝缘和机械支撑。但是，实际操作和先前的研究[1-5]表明，由于在单极性电场下的电荷积累，在HVDC应力下的绝缘子表现出与HVAC绝缘子不同的长期行为。绝缘体与周围气体及其附近的界面似乎是发生严重放电而导致表面飞弧的最脆弱区域。已有关于电荷传输过程建模的工作[6-8]，但其中大多数涉及相对较低电压水平（通常低于200 kV）的应用。

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