Electric Field Characteristics Analysis Of Bundle Conductor Spacer Based On Finite Element Method

UHV power grid has the characteristics of long distance,large capacity and low loss.This transmission mode is in line with China’s national conditions and can adapt to the future development trend of power grid.With the increase of the voltage,the electric field strength on the surface of bundled conductor and power fittings will increase,and corona discharge will occur when the critical value is reached.When corona occurs on the transmission line,audible noise,radio interference,synthetic electric field and ion flow will be generated,which will affect the surrounding environment of the line.Therefore,higher and higher requirements are put forward for the electrical and mechanical properties of line fittings,as well as the stability and flexibility of various components.Bundle Conductor spacer is one of the commonly used hardware in high-voltage transmission lines.Its anti-corona design plays an important role in reducing the corona effect of the whole transmission line.The main factor affecting the starting corona voltage of spacer is the intensity of electric field on the surface,which is related to the surface smoothness of spacer and the design structure.The design parameters that affect the surface electric field strength of spacer mainly include wire radius,wire clamp curvature radius.It is of great significance to study the influence rules of the three main parameters on the surface electric field strength of spacer in practical engineering.Through the calculation of the surface electric field by the three-dimensional finite element electric field simulation software,the electric field strength on spacer surface is obtained,on the basis of that the influence rule of main design parameters on surface electric field strength of spacer is analyzed.In order to obtain the best calculation model of electric field strength on the surface of spacer,the different function models are compared,on the basis of that the formulas for calculating the surface electric field strength of four,six,eight and any type spacer are obtained.The electric field strength on busbar spacer surface is obtained,on the basis of that the influence rule of main design parameters on surface electric field strength of busbar spacer is analyzed.Then the formulas for calculating the surface electric field strength of busbar spacer is obtained.Finally,the spacer simulation model was encapsulated into a user-friendly electric field simulation App,which realized the rapid simulation under different parameters.In the process of using the simulation App,only necessary parameters need to be modified to conduct fast simulation,which simplifies the simulation process and reduces the simulation time.The results of this paper provide a reference for calculating the surface field strength of the spacer in the UHVDC transmission line and selecting the spacer design parameters in actual engineering.