空气动力型防污绝缘子设计与流体力学仿真分析

Design of Aero Dynamical Antipollution Insulator and Fluid Dynamics Simulation Analysis

为了克服大风沙运行环境中钟罩型绝缘子伞棱部位积污较严重的缺点,文中提出了一种利用空气动力结构使绝缘子伞裙附近保持较高空气流速,使表面不易附着沙尘的防污悬式绝缘子,其具有大、小两层伞裙,上层大伞裙边沿设计有小伞棱,下层小伞裙下倾角度大于上层大伞裙,爬电距离与相同机械载荷等级钟罩型绝缘子近似相等。并且,利用计算流体力学仿真软件对绝缘子附近空气流场进行仿真计算,设置3个空间截面,利用截面流速云图中伞裙附近低风速区占比数值,对比了此空气动力型结构与传统钟罩型和双伞型结构的差异。结果表明,新结构伞裙低风速区范围明显小于传统结构,且低风速区集中在瓷柱背风侧小范围内,有利于风向变换时依靠风力清除已附着的沙尘、污秽,验证了新结构伞裙的防污优势。

In this paper,a structure of aero dynamical antipollution insulator is designed for overcoming the weak- ness of bell-shaped insulator having more serious contamination on the lower shed surface in windy and dusty envi- ronment. Benefiting from aero dynamical structure,the airflow velocity is maintained a high value around sheds, and it is not easy to deposit dust on the shed surface. The alternating sheds structure has a small rib which is set on the edge of the upper big shed,and the inclination angle of the lower small shed is less than the upper one＇s. The creepage distance of aero dynamical insulator is approximately equal to the bell-shaped one with same me- chanical load. In addition, the airflow field near insulator is simulated by CFD software. The area proportion of low airflow velocity Ph is defined by the data of velocity contour in three sections in 3D space. Comparing the values of P- in the simulation of aero dynamical insulator,bell-shaped insulator and double-shed insulator,it is indicated that the scope of low airflow velocity zone of the new structure is obviously smaller than that of the traditional structure, and the low airflow velocity zone is located mostly in leeward side of porcelain column that is helpful to remove the attached contamination when the wind direction changed. Accordingly,it is certified the antipollution advantage of the new type insulator.