| Insulators are devices that are mounted between different potential conductors or between conductors and ground potential components,and play an important role in electrical insulation and mechanical support.As an important part of the insulation of the transmission line,the insulating property of the insulator is closely related to the safe operation of the power system.In recent years,the problem of wet deposition of particles caused by environmental pollution and frequent fog and haze weather in low wind speed inland areas has not only increased the amount of contamination on insulator surface,but also created conditions for pollution flashover accidents due to its high humidity.Therefore,it is necessary to study the fouling characteristics of typical porcelain insulators.In this paper,the XSP-160 porcelain three-umbrella insulator is taken as the research object.From the aspects of fluid mechanics and electromagnetic field theory,the motion of the contaminated particles and the adhesion process with the insulator wall are analyzed.Based on the wind tunnel test of our school,the pollution model of the insulator is established by using three-dimensional modeling software,and the deposition criterion is used to simulate the pollution characteristics of the insulator under the wind tunnel conditions in COMSOL numerical simulation software.The simulation results are compared with the experimental results to verify the rationality of the simulation method.According to these results,the natural fouling characteristics of XSP-160 porcelain three-bladed insulators in low wind speed environment were studied.The actual wind speed,wind direction dip,relative humidity and direct and AC voltage types were analyzed on the actual 110kV transmission line.Its natural fouling characteristics.The results show that:1)The wind tunnel test results are in good agreement with the numerical simulation results.The average error between them is 10.56%,and both of them have a“V”distribution with respect to 0kV voltage,which verifies the rationality of the sedimentary model.2)The deposition model is applied to the simulation of the natural fouling characteristics of the XSP-160 porcelain three-bladed insulator.Under the action of 110kV DC and AC voltage,the surface area of the insulator increases with the increase of wind speed.3)Under the action of DC voltage,when the wind speed is the same,the amount of pollutants decreases with the increase of the wind direction inclination angle,and the change trend under the AC voltage is opposite.4)Under the action of DC voltage,the amount of pollutants decreases with the increase of wind direction inclination angle and the rate of decrease becomes slower and slower;under the action of AC voltage,when it is within the range of 0°30°wind direction inclination angle,the amount of pollutants water It increases with the increase of the dip angle of the wind,and when the temperature is 30°60°,the amount of pollutants at the small wind speed decreases with the increase of the wind direction dip angle.When the wind speed is large,the law is opposite.5)Under the action of direct and AC voltage,the amount of pollutants accumulated by the insulator increases with the increase of relative humidity,and the relative humidity has a greater influence on the amount of pollutants under the action of AC voltage.6)Under the action of DC voltage,the amount of pollutants increases most when the humidity is low（30%50%）,the second is medium humidity（50%70%）,and the lowest is high humidity（70%90%）.The law under the action of AC voltage is opposite.7)The NSDDDC/NSDDAC decreases as the dip angle increases and the rate of decrease decreases. |
