Study on Flashover Factors and Pollution Test about Catenary External Insulation in Datong Area along Da-Qin Railway

In this paper,the impact on the catenary external insulation of heavy-duty coal railway was studied,which was consist of the meteorological conditions,topography,and ash dust,discussed the relationship between the influencing factors and external insulation flashover,designed the testing scheme of pollution along the railway line,and analysed the salt density value of the insulator in the typical zone.The research results provided a basis for pollution class division and drawing distribution maps of polluted areas.