Among all kinds of safety accidents in power system

pollution flashover caused more economic loss because of its large impact area and long impact time.To explore the pollution characteristics of insulators under the coupling effect of air flow and electric field

and contamination’ s sensitivity of various influencing factors

a typical insulator’ s contamination model in wind tunnel was established with multiphysics simulation software

and a feature particle tracking method was proposed based on sample survey and feature particle analysis.On this foundation

computational fluid dynamics was used in the simulation study

and the effects of AC and DC electric fields were taken into consideration to track the trajectory of contaminated particles in a motion cycle.Then the unitary pollution characteristics of insulator can be determined from the weighted average tracking results of sample particles with single particle size and charge amount.The simulation results show that the pollution amount of insulator surface is a comprehensive result of the influence of electric field strength

wind speed and feature particle size of the contaminated particles

and there are significant differences in the sensitivity of contamination to the electric field intensity under different environmental conditions.