The Effect Of Snowy Weather On Electromechanical Characteristics Of Transmission Line And Insulator In High Altitude

Geermu, in Qinghai Province, the average of the height above sea level is about more than 3000 meters. And the surface composition of it contains a large number of saline and alkaline soils. What’s more, there are always strong winds and heavy snow throughout the years and years. This particular geographical and climatic condition is a kind of severe test to the transmission lines and insulators in the region. The wind results in the windage yaw of the transmission line, decreasing the air gap between the insulators and tower, eventually causing flashover. The particles of salinity class can easily attached to the surface of insulators, forming the contamination in the snow weather, which causes the momentary increase of the leakage current on the insulator string’s surface and the decrease of the flashover voltage of insulators, thereby reducing the insulating properties of the insulators. Therefore, in order to ensure the safety of the transmission lines’ operation, the study of the windage yaw response under the action of strong wind and the study about the leakage current of insulators in snowy weather of the transmission lines are particularly important.Firstly, this paper introduces the harms what the high altitude and snowy weather do to the transmission line and insulator and introduces the research status at home and abroad. The stochastic turbulent wind field was set up by matlab, which simulate the Geermu in Qinghai, and the lines-insulator coupling model was established by ansys. Furthermore, the transient response analysis was completed under the stochastic wind velocity field, which helped to obtain the windage yaw response of the end of the insulator, so it can be compared with the safety air gap at last. Then, in a solution of different p H value, use the experimental method to study the change of the hydrophobic of insulators and the influence to the characteristics of leakage current as well as the recovery properties after losing hydrophobicity. And by measuring the characteristic of leakage current to study how the contamination on the surface impacts on the surface hydrophobicity of composite insulators. Finally, the influence of salt density and ash dense to composite insulators and leakage current of RTV coating surface was studied.This article adopts the methods of theoretical analysis and experimental research to study the windage yaw characteristics of transmission line and hydrophobic of insulator in the condition of high altitude and snowy weather in Geermu, Qinghai Province, the results have a practical significance to the safe operation of transmission lines in the local.