高速气流环境绝缘子污闪研究

Study on Insulator Flashover Under Pollution Status in Intermittent High Speed Train Wind

在分析了自然环境直、交流闪络模型基础上,研究了电气化铁路间歇性高速风环境下绝缘子表面闪络的影响因素、高速气流环境、绝缘子表面气压分布不均、周围风速改变;在该环境下污秽、雾、雨将会短时间形成规律性分布,构成导电通道,产生电弧,发生闪络。在干燥状态高速风环境下绝缘子表面产生电荷,不均匀分布电荷引起表面电场畸变,诱发闪络。利用流体力学知识通过分析特定粘度流体一定风速下在绝缘子表面的分布状况,从而分析绝缘子污闪。同时,由于不同速度的列车风导致边界层变化、吹弧作用会对闪络造成不同程度的影响,根据不同速度与闪络电压的关系对闪络模型进行修正。

The flashover influent factors on the insulator surface in the intermittent high speed train wind based on the discussion of the development of both AC and DC flashover model in nature ambient.In the high speed wind,the pressure on the insulator surface,the speed distribution of the wind and its characteristics change a lot compared with normal cases.In this environment,pollution,fog,and the rain will regularly distribute in short time,and this will form a discharge channel,yield arc and finally lead to flashover.When the insulator surface is dry,the high speed wind will bring some charges on it,the uneven distributed charges will make the electric field distorted and cause the flashover at last.So the pollution particle accumulation character on the insulator surface is analyzed to study the flashover.At the same time,the thickness of boundary layer changes with the wind,so the arc blow effect exists for some extent.According to the relationship of the wind speed and the flashover critical voltage,the model is modified.