Study On The Influence Of Additional Metal Structure On Electric Field Distribution Characteristics Of Insulator String

Stable operation of insulator in 110 kV AC transmission line in the safe operation plays a crucial role for the line insulation and current 110 kV porcelain insulators in the transmission line still occupies a large proportion,the following work has been done and a new method of improving 110 kV ceramic insulator flash over voltage:Firstly,the mechanism of pollution flashover is analyzed.From the process of pollution flashover,it is known that there are two main conditions for the occurrence of pollution flashover.The first one is that the field intensity is larger,and the other is the tangential field strength of the insulator surface.According to the two conditions of pollution flashover,this paper puts forward a method to increase the pollution flashover voltage.Based on the calculation method of the electrostatic field on the insulator according to the actual size and characteristics,choose ANSOFT MAXWELL was calculated,according to the actual working conditions of 110 kV ceramic insulator,a 3D simulation model was established,considering the actual tower around in the calculation,and the influence of the wire,on insulator cap increase structure and without the electric field distribution were calculated and analyzed under the condition of insulator string structure.The results show that the structure can effectively reduce the maximum electric field strength,optimize the distribution of field strength,reduce the tangential electric field on the surface of the umbrella group,and improve the breakdown voltage of the insulator strings.Increase the structure can effectively restrain the insulator maximum field strength,but not any structural parameters can play a good role,structure parameters are improperly positioned,but will decrease the creepage distance,the insulator electric insulation performance is reduced,counterproductive.In this paper,using exhaustive method,simulation and calculation in a number of different structure parameters of the tangential field strength,thus,the nonlinear relationship between the structural parameters and the tangential field strength is obtained.In order to get the optimal structure parameters,this paper uses neural network genetic algorithm.The calculation results show that the optimal structure parameters,which is far lower than the strong dizzy games not installed between the structure and the tangential field strength minimum.According to the structure and increase of insulator strings without structural parts in different pollution level under the pollution flashover test,studied under different pollution level under the influence of different structural parameters,and the flashover voltage test showed that the pollution level is higher,structure to enhance the pollution flashover voltage of the effect is more obvious.