In this article, the mechanisms of surface charging and surface modification of epoxy spacer affecting the lifting voltage and the motion trajectory of spherical metal particles in a downsized dc gas insulated transmission line (GIL) are investigated by simulations and experiments. Results show that the lifting voltage can be predicted with much accuracy by calculating the electric field distribution under the capacitive condition. Prestressing leads to a 27% decrease of lifting voltage, which is traceable to that surface charging making a major contribution to the enhancement of electric field force. Direct fluorination is proven as an effective modification method to improve the insulation performance of epoxy spacer again. The lifting inclination is significantly inhibited after treatment because of less surface charge accumulation and more rationalized electric field distribution. The trajectory simulation results indicate that more serious surface charging can activate more metal particles to lift up and drive them to more collisions. The lifting probability and velocity of metal particles around the epoxy spacer are markedly decreased by fluorination, which is a promising treatment for dc GIL/gas insulated switchgear (GIS) application.

中文翻译：

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表面充电影响 HVDC GIL/GIS 环氧树脂间隔件周围金属颗粒的提升行为


本文通过模拟和实验研究了环氧间隔物的表面充电和表面改性对小型直流气体绝缘输电线路（GIL）中球形金属颗粒提升电压和运动轨迹的影响机制。结果表明，通过计算电容条件下的电场分布可以非常准确地预测提升电压。预应力导致提升电压降低 27%，这可以追溯到表面充电对电场力增强的主要贡献。直接氟化被证明是再次提高环氧间隔件绝缘性能的有效改性方法。处理后，由于表面电荷积累较少，电场分布更加合理，抬升倾斜得到明显抑制。轨迹模拟结果表明，更严重的表面充电可以激活更多的金属颗粒抬起并驱动它们进行更多的碰撞。氟化可显着降低环氧树脂垫片周围金属颗粒的提升概率和速度，这对于直流 GIL/气体绝缘开关设备 (GIS) 应用来说是一种有前途的处理方法。