In this study, a simulation model is established to study the effect of surface conductivity on the accumulation of surface charge. The simulation shows that hetero-charges increase on areas away from the high voltage electrode and the electric field distribution along the surface becomes more uniform with increased surface conductivity. The dominant surface charging mechanism changes from conduction through the bulk of the insulation to surface conduction with increased surface conductivity. When the surface conductivity ranges from 1∗10−15 to 5∗10−14 S for a convex spacer surface, an optimal surface charge suppression and electric field homogeneity can be realized.

中文翻译：

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表面电导率对 DC-GIL 间隔物表面充电行为的影响

本研究建立了一个模拟模型来研究表面电导率对表面电荷积累的影响。模拟表明，远离高压电极的区域的异质电荷增加，并且随着表面电导率的增加，沿表面的电场分布变得更加均匀。主要的表面充电机制从通过绝缘体的传导变为表面传导，表面电导率增加。当凸间隔表面的表面电导率范围为 1*10-15 到 5*10-14 S 时，可以实现最佳的表面电荷抑制和电场均匀性。