Simulation Study On Sewage Characteristics Of Porcelain Double Umbrella Insulators In Sewage Environment

Insulators mainly play the role of mechanical support and electrical insulation on the transmission line.Porcelain double umbrella insulators are widely used due to their good chemical stability and mechanical strength.In recent years,along with the rapid development of industry,environmental pollution has become more and more serious.The smog weather caused by environmental pollution has seriously affected the performance of the insulator and threatened the safe operation of the power system.Therefore,it is necessary to study the pollution characteristics of ceramic double umbrella insulators under foggy conditions.In this paper,the XWP2-160 porcelain double umbrella insulator is used as the research object.A physical model of the insulator’s fouling is established using COMSOL software.The 110k V porcelain transmission double insulator insulator is simulated and analyzed in a mist environment The average force of the droplet near the surface was analyzed.The results show that:1)When the particle size of the droplet is between 1μm and50μm,the weight range is about 10^-16～10^-10N;the electric field strength range is about 10^-13～10^-8N;the fluid drag level range is about In 10^-12～10^-8N 2)In the horizontal flow direction,the drag force plays a dominant role in the droplet movement;in the axial direction of the insulator,the electric field force increases with the increase of the droplet size,and then exceeds Drag.3)Under the action of DC voltage,AC voltage or no voltage,the total volume of insulator（ESDD）increases with the increase of wind speed in the range of particle size.4)Under the action of direct current,the droplet size（ESDD）increases with the increase of the particle size in the range of 1-45μm at each wind speed,and the growth rate is first and then small;the particle size is 45-50μm.At the time of the decrease in the amount of accumulated dirt（ESDD）,the maximum amount of accumulated soil（ESDD）was reached when the particle size was 45μm.5)Under each wind speed,as the particle size of the droplet increases,the difference between the amount of dirt under the DC voltage and the amount of accumulated dirt under the other two voltages increases first and then decreases,and the difference between the AC voltage and the voltage-free situation is higher.small.6)When the AC voltage is applied,there is more dirt on the upper surface of the insulator than on the lower surface,and as the particle size of the droplet is larger,the difference in the amount of the upper and lower surface areas becomes more and more obvious;when the DC voltage acts,the opposite is true.The amount of dirt on the surface is more than that on the upper surface,and as the particle size of the droplet increases,the difference in the amount of dirt between the lower and upper surfaces is also increased.7)As the particle size of the droplet increases,the orthogonal ratio of the volume of the insulator increases first and then decreases with the increase of the particle size,and the orthogonality of the fouling at each wind speed becomes larger than the whole.8)When DC voltage is applied,when the particle size is 1μm,the fouling is W-shaped along the shed,and the wind speed is more obvious.When the particle size is 10μm and 20μm,the fouling is along the umbrella skirt.M type,the greater the wind speed,the more obvious the effect.