In order to study the effect of surface roughness on the insulator flashover characteristic

using different mesh uniform sand paper on the insulator surface with grinding and using laser confocal microscopy to quantify the insulator surface roughness. Using the steep front impulse test device to produce standard lightning shock

and the different roughness of insulator on the positive and negative standard thunder electric wave

observed in the standard of different polarity thunder electric wave along the surface under the action of insulator flashover voltage and the relationship between the surface roughness

and from the experiment with the increase of insulator surface roughness insulator flashover voltage decreases 50 %

the positive and negative polarity standard ray waves new insulator without sanding the highest average 50 % breakdown voltage of the insulator

424. 9 k V

429. 1 k V

the roughness of insulator flashover voltage and has not polishing the insulator flashover voltage ratio under semilog coordinate system of the relationship with the roughness of a linear relationship.