Simulation Study On The Contamination Accumulation Characteristics Of The Porcelain Three Umbrella Insulators

The flashover accident caused by pollution of insulator surface is common in transmission line and seriously affect the safe operation of power system. Three umbrella porcelain insulator is widely used in the transmission lines and electrical equipment and plays a vital role for safe operation of electric power system. Thus the study on pollution deposition of insulator is very important for anti fouling work.This research studied the pollution characteristics of XSP-160 type three umbrella porcelain insulator under wind tunnel test using COMSOL simulation software, and compared with the results of the wind tunnel test. The results showed that the deposition magnitude agreed well in the two situations and in accord with each other with voltage and had a "V"- shaped distribution, so the research methods used in this paper is verified. On this basis, the natural contamination depositing characteristics of the three umbrella porcelain insulator was simulated with different wind velocities, particle sizes, voltage types, particle charges, and the contamination distribution characteristics along and on the upper and lower surface insulator umbrella groups were also discussed.The results showed that: the overall deposition of the insulator increases with wind velocity and reached saturation value; the amount of deposition increases as the particle size increases and affect on deposition by wind speed has weakened; overall filthy under DC voltage is larger than situations of AC voltage,and the deposition rate under AC voltage and values attained without power is fairly the same multitude and basically changes little with the particle size; The deposition ratio under DC and AC voltage decreases as wind speed increases, and increases as the particle size increases; The particle charge, to a large extent, influences the filth deposition on the surface of the insulator under DC condition, the greater the charge, the deposition is higher; in the small wind speed or large particle size, the deposition along umbrella groups has a irregular "U" type distribution under DC condition, and are bigger at higher voltage and terminal end; with the increase of wind speed or the decrease of particle size, the feature of "U" type distribution gradually disappear, weakening the influence of electric field on the surface of the insulator contamination; and the deposition on the upper and lower surface under AC voltage and values attained without power is fairly the same multitude with different wind velocities and particle sizes, the deposition on the upper and lower surface significantly increased when DC voltage was applied or wind speed increased.