输电线路悬式复合绝缘子雨凇与轻雾凇覆冰形态和覆冰过程对比研究

A Comparative Study on Icing Morphology and Process of Glaze and Light Rime in Suspension Composite Insulators on Transmission Lines

覆冰形态是影响输电线路绝缘子闪络的重要因素之一。目前未见各类型覆冰形态差异及其原因的相关研究,绝缘子覆冰形态形成的微观物理过程研究较少。覆冰过程包括水滴撞击,捕获和冻结三个过程。对比研究了南方电网电线路灾害(覆冰)预警系统监测的悬式复合绝缘子雨凇、轻雾凇覆冰形态,通过Fluent仿真研究了两类覆冰形态的水滴与绝缘子撞击过程,计算了绝缘子伞裙上表面、伞裙边缘和杆径的水滴撞击数和撞击密度,通过微气象数据分析研究水滴冻结过程,从水滴撞击和冻结两个过程理论解释了雨凇和轻雾凇两类覆冰形态差异的原因。

Icing morphology is one of the important factors on insulator flashover. Currently, there are no related studies on various types of icing morphologies, their differences, and their causes, and less on microphysical processes of insulator icing morphogenesis. Icing process includes water droplet impacting, capturing and freezing. In this paper, a comparative study on two types of icing such as glaze and light rime on suspension composite insulator, and their differences, based on the monitored images by China southern power grid transmission line disaster（icing） early warning systems. Water droplets collide process with insulators for two types of icing morphologies was simulated via Fluent and the number and density of water droplets colliding on the top surface, the end and the roots of the sheds on the simulated composite insulator were calculated. The freezing process of water drops was investigated through an analysis on micro-meteorological parameters, the reason of icing morphology different was discuss from the drop collide with the insulator process and the drop freezing process.