Research On High-Speed Train Composite Insulator Hydrophobic Influencing In Sand-Dust Environment

In recent years, with the rapid development of China’s railway construction, high-speed rail EMU due to high-speed, safe and fast it is increasingly important to highlight the advantages of modern passenger transport system, and faster speed and more complex operating environment makes the high-speed train work more demanding. Currently along the railway line in Northwest China the climate is dry and bad, Xinjiang, Inner Mongolia, Gansu, Qinghai and other places from time to time there are different degrees of dust weather, could easily lead to spark appears to run around and even train roof insulator flashover accident, but because of composite insulators It has excellent water-repellent and water-repellent unique mobility are widely used, so the roof with good hydrophobic insulator to prevent pollution flashover has great significance. In order to study on the environmental impact of dust on the roof of the hydrophobic insulator process, based on the measurement method of composite insulators and dust conditions on composite insulators and abrasive dust corona aging expand research, proved the dust contamination and abrasion influence of surface hydrophobicity of sheds, so as to safeguard high-speed reference the safe operation of the train.In the analysis of the hydrophobic composite insulators through the surface of microscopic droplets of Materials Research and stress analysis results shed surface has excellent water-repellent and water-repellent mobility principle, explores the structure of composite insulators roughness and surface contamination on hydrophobic. Aiming at the insulator surface hydrophobic binding HC measurement method proposed grading and digital image processing integrated hydrophobic assay, and measurement error factors shooting may occur during commencement of the corresponding experimental analysis.For possible electrical aging in the operation of trains, established for composite insulator corona aging test, By adjusting the applied voltage level and duration of composite insulator is studied under the condition of different electrical aging of hydrophobic decline and recovery, using insulator string voltage distribution test to obtain different sheds insulated voltage distribution, explores the relationship between aging and changes in electrical properties of the hydrophobic, and use the wind tunnel experiment of needle plate discharge experiments to study the different wind speed under the action of the breakdown voltage of change rule.Considering the environmental impact of dust in different wind speed and density of composite insulators dust hydrophobic, the article establish the flow characteristics of composite insulators around simulation and the establishment of a wind tunnel experiment platform to simulate the natural environment of dust at high wind speeds. Through the simulation of flow field around the insulator has been under high-speed air stream insulator sheds in different regions of sub-type bout, through wind tunnel experiment platform we studied the distribution of composite insulators contamination with the corresponding change in the hydrophobic sand under different conditions. To further understand the impact of abrasive dust hydrophobic insulator, we use sandpaper abrasive surface wear experimental to analyze the deterioration of the surface hydrophobicity.