基于等效直径的复合绝缘子覆冰特性与结构参数分析

Research on Icing Characteristics of Composite Insulator and Structural Parameter Analysis Based on Equivalent Diameter

复合绝缘子伞型结构是影响其覆冰的重要因素,优化其结构参数可以减少覆冰量。对复合绝缘子外部流场数学模型进行简化,利用Fluent软件仿真计算其沿绝缘距离方向上各部位的水滴碰撞率,并在此基础上提出复合绝缘子覆冰等效直径D_(eq)的概念。理论分析和自然覆冰试验均表明:在同等覆冰条件下,D_(eq)越大的复合绝缘子,覆冰量也越大。因此,将D_(eq)作为表征复合绝缘子覆冰特性的特征参数,研究了杆径、伞间距、伞倾角和伞径对D_(eq)的影响,结果表明D_(eq)随杆径和伞间距的增大而增大,随伞倾角和伞径的增大而减小。最后结合分析结果与覆冰试验,给出覆冰地区复合绝缘子结构参数优化设计建议。

The shed structure of composite insulator has much influence on its icing characteristic.Optimizing its structural parameter can reduce the ice amount. This paper simplifies the fluid field mathematical model of composite insulators and calculate the water droplet collision coefficient along the insulation distance direction by Fluent simulation software. Based on this,this paper put forward the concept of icing equivalent diameter of composite insulator D_（eq）. Theoretical analysis and icing test results show that under the same condition,the bigger D_（eq）of the composite insulator,the greater the amount of ice also. Therefore,this paper uses D_（eq）as the characteristic parameter and studies the relationship between structural parameters and D_（eq）. The results are as follow： D_（eq）increases with increasing of rod diameter and shed distance,but decreases with increasing of shed inclination and shed diameter. Considering the results of analysis and icing test,suggestions for optimizing the structure of composite insulators＇ sheds to be used in icing areas are given below： decrease the rod diameter,increase the shed inclination and shed diameter properly on condition of material stiffness allows and manufacturing cost is acceptable; increase the shed distance properly and there can be some small sheds between adjacent large sheds.