Influence Factors of Three-Dimensional Icing Characteristics on Insulators
Gao Jin1, Guo Sihua1, Han Xingbo2, Jiang Xingliang3, Zhang Qi1
1. State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute Chongqing 401123 China; 2. School of Mechatronics and Vehicle Engineering Chongqing Jiaotong University Chongqing 400074 China; 3. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China
Abstract：Icing can greatly degrade the insulation performance of insulators and seriously threaten the stable operation of transmission lines. Studying the characteristics of insulator icing and establishing a numerical model is the basis for solving the problem of insulator ice flashover. In order to study the development rule and influence factors of insulator icing under natural conditions, this paper analyzes the processes of water droplets collision, freezing and water film flowing on insulator surface. The differences of different insulator icing types are analyzed, and a three-dimensional insulator icing calculation model is established based on the theory of hydrodynamics and thermodynamics. Based on the model, the insulator LXY-120 is taken as an example to simulate the icing process under different environmental conditions. Moreover, the related icing tests of two different kinds of insulators are carried out in Xuefeng mountain. The measured insulator icing weight and the maximum icing thickness are compared with the simulation results. The results show that under different environmental conditions, the insulator icing type, the development process, the icing area, and the rate are different. In addition, the insulator structure will affect the icing rate. With a smaller diameter, a thinner shed and a multi-shed structure, the composite insulator FXBW-220 has the greater icing rate than that of the glass insulator LXY-300, and the ice can quickly connect the sheds of composite insulator under natural environment.
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2021, Vol. 36 
