Analysis Of Fouling Characteristics Of Double String Insulator And Development Of Power Cleaning Device

Transmission line pollution flashover is an important disaster threatening the safe operation of power grids and has attracted a lot of attention from scholars at home and abroad.The accumulation of pollution on the surface of insulators affects the physical and chemical properties of the insulator surface,which has become one of the main factors causing pollution flashover.At present,the pollution of insulators The accumulated analysis is mainly through natural pollution accumulation experiments and wind tunnel experiments.The cost is relatively high,and it mainly focuses on the total volume pollution of a single string of insulators.However,transmission lines in large-span areas will use a lot to prevent string drop events.Compared with single-string insulators,the flow field of double-string insulators is more complicated.Knowing its contamination status can provide a reference for cleaning insulators.At present,manual cleaning is widely used.The work intensity is high,the cleaning efficiency is low,and there are safety risks.Therefore,Need to design a cleaning device instead of manual cleaning.The paper analyzes the collision deposition characteristics of polluted particles and studies the speed changes of polluted particles in the flow field.At the same time,most areas of my country are affected by airflow in a single direction throughout the year.Therefore,the single-wind downward double-string insulators are affected at different wind speeds,The uneven distribution of pollution in the circumferential direction under the condition of string spacing is numerically simulated.At the same time,a live cleaning device for insulators was developed,and the stress analysis was carried out on the rack and pinion of the lifting mechanism,and a prototype was developed for simulation experiments to simulate the electric field under operating conditions.The research results show that the pollution accumulation near the stagnation point on the windward side of the upwind insulator is the most serious and the pollution accumulation is more concentrated.Due to the wake of the upwind insulator,the leeward side of the upwind insulator has less pollution accumulation,and the windward area of the downwind insulator is also less polluted than the upwind insulator.Windward side.Due to the obstruction of the air flow inside the grooves on the lower surface of the double string insulator,many small turbulent vortices are formed,resulting in a large amount of contamination inside the grooves.As the wind speed increases,the wake of the upwind insulator will have a greater impact on the downwind insulator,which will increase the amount of pollution and the pollution distribution range.As the string spacing increases,the pollution law of the double string insulators will gradually interact with each other.Close.In addition,based on the structure of the insulator,the insulator live cleaning device is designed that can be stably clamped on the insulator hanging plate,and the rack and pinion is used for lifting and the upper and lower surfaces of the insulator can be cleaned 360° by the cleaning claw.The three-dimensional model of the cleaning device is established by Inventor.,Designed its lifting mechanism,cleaning claw mechanism,fixed mechanism and control system,and carried out stress check on the lifting mechanism of its core moving parts.The rack and pinion lifting mechanism is equipped with different weights,different lifting speeds and gears during operation.When subjected to wear,the tooth surface and tooth root can better meet the stress requirements,and there will be no safety problems.The laboratory prototype experiment shows that the cleaning device can complete the operation process well,and can accurately complete the cleaning of each insulator.The electric field simulation shows that the device will not cause air corona under the 110kV electric field,and the working environment is safe.The operation process only affects the insulators.The electric field produces less distortion and will not affect the safe operation of the device and the stability and reliability of the transmission line.