In this paper, an electro-thermal based surface charge accumulation model is established. Heat conduction, heat convection and heat radiation are included. The gas flow is coupled with fluid equations to describe the motion of charge carriers, and gas current density is also corrected by the gas velocity. In terms of it, the surface charge and electric field on a basin-type insulator in vertical laid DC gas insulated switchgear (GIS) and gas insulated transmission line (GIL) under different temperatures and pressures are studied. The results show that a temperature gradient is formed in the gas from top to bottom in the vertical direction, and the increase in pressure leads to a higher temperature of the lower surface. The surface charge density and tangential electric field increase with the temperature and decrease with the pressure. As a comparison, the surface charge and tangential electric field are calculated without considering temperature and without considering heat convection. The former leads to a lower tangential electric field than this model, while the latter brings about a higher electric field. This paper provides a more accurate reference for the design of DC GIS/GIL through a more comprehensive model.

中文翻译：

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温度和压力如何影响 HVDC GIS/GIL 中的电场分布：数值研究

本文建立了基于电热的表面电荷积累模型。包括热传导、热对流和热辐射。气体流动与流体方程耦合来描述电荷载流子的运动，气体电流密度也由气体速度校正。为此，研究了垂直敷设直流气体绝缘开关设备（GIS）和气体绝缘输电线路（GIL）中盆式绝缘子在不同温度和压力下的表面电荷和电场。结果表明，气体在垂直方向上自上而下形成温度梯度，压力的增加导致下表面温度升高。表面电荷密度和切向电场随着温度的升高而增加，随着压力的增加而降低。作为比较，计算表面电荷和切向电场时不考虑温度和热对流。前者导致比该模型更低的切向电场，而后者带来更高的电场。本文通过更全面的模型为DC GIS/GIL的设计提供了更准确的参考。