For studying the influence of charged pollution particles on the surface pollution and electric field distribution of insulators as well as the corona discharge phenomenon in the air domain

the FXBW-35/70 insulator is taken as the study object

the coupling wind tunnel model of AC-DC

turbulence

charged particle interaction and particle motion is constructed by using the multi-physics coupling finite element software Comsol Multiphysics

and the distribution of corona discharge by charged particles on the surface of insulators

electric field and air domain is studied. The result shows that the higher the wind speed

the faster the pollution accumulation speed in the windward area compared to other areas

the larger the particle size

the more severe the pollution in the windward area

the less pollution in the leeward area

and the little change in the crosswind area. The surface potential and electric field distortion of the shed in the windward area are the most severe during pollution

followed by the leeward area. After pollution

the surface potential and electric field of the shed have eased

and the windward area is more severe than the leeward area. During the pollution

there is a risk of corona discharge in the air around a large and small shed near the high-voltage and low-voltage ends

and the first large shed near the high-voltage and low-voltage ends will experience corona discharge. After the pollution

there is a risk of corona discharge within 1mm at the root of large shed of low voltage side

and also round the whole large shed of the high voltage side as well as the root of the small shed.