Research On The Distribution Characteristics Of Electric Field Along The Surface Of Composite Insulator Under Power Frequency Voltag

With the development of the electrical industry,a mass of electrical insulators are used in power lines and distribution systems,especially for composite insulators,which are widely applied for its good properties.Therefore,the research is of great significance to the safety and stability of transmission lines on the surface electric field distribution of insulators under the Power Frequency Voltage Act.Taking a 10 k V composite insulator as an object of study,the paper analyses the axial and radial surface electric field distribution of composite insulators in the case of normal times,damage,internal defects and pollution.Considering the asymmetries caused by insulators’ internal defects and damage,the researcher uses COMSOL Multiphysics(a finite element simulation app)to create four 1:1 three-dimensional models of composite insulators.They are respectively in the condition of normal circumstance,damage,internal defects,and 1 mm of Na Cl-polluted conductive material covering the surface.With AC/DC Module,the axial and radial surface electric field distribution can be obtained by solving conservation equation.Then,under mains frequency voltage,the electric field distribution is analyzed and compared of normal situation,different damaged and internal defect positions and contamination layers.In addition,the power frequency calibration experiment of the integrated optical wave conductive field sensor is carried out by parallel metal plate and the axial and radial surface electric field distribution of the normal,damaged and internal defect composite insulators is tested by the integrated optical wave conductive field sensor.Besides,the results of different tests are analyzed and compared.Finally,the simulation calculation of the composite insulators is compared with the experimental test results of the distribution of the axial and radial surface electric fields.Thus,the distribution law of the axial and radial electric fields along the surface of the composite insulators is obtained under different conditions.The test results can detect the internal flaws of composite insulators with a length of 5 mm and10 mm,which makes the measurement of insulators in high-voltage environments possible and provides a new technical means for the actual measurement of the surface electric field of the insulators.It can also offer data support for the state detection of the insulators and the insulation structure design.