| Due to the mismatch between the distribution of power resources and load centers in China,the research on UHV transmission technology has become one of the hot spots.However.with the continuous development of China’s economy,there are continuous and serious haze and dust weather in most regions of the country.In these complex meteorological environments,a large number of pollutants will accumulate on the surface of high-voltage transmission lines,which will affect the surface morphology of transmission lines,and then affect the electric field distribution on the surface of transmission lines and induce corona discharge.Therefore,it is of great significance for the optimal design of HVDC transmission lines and the extension of the operating life of the conductors to reduce the surface pollution and the surface roughness of the transmission lines.In this paper,the removal process of TiO2 coating on the surface of conductor under different electric fields is studied,and the influence mechanism of external electric field on photocatalytic process is explained by simulation calculation,which is of great engineering reference value for the application of anti pollution technology of transmission line.In this paper,TiO2 coating with dense,smooth and excellent photocatalytic properties was prepared on the surface of smooth conductor by thermal spraying.At the same time,the surface state of the conductor is characterized by electron microscope,white light interference topography and energy spectrum.Observe the variation of the surface morphology and surface condition of the experimental wire under different fouling,light time and electric field intensity.In this paper,based on the photocatalytic experiment platform,the degradation experiment of TiO2 coating on the artificial and natural filth under different external electric field conditions is carried out.At the same time,the influence of external electric field on the photocatalytic process of TiO2 coating on the conductor is obtained through the change of concentration of artificial filth and the change of surface state of natural filth obtained by white light interference method.At the same time,by studying the corona characteristics of the transmission line under different surface states,The results show that the applied electric field helps to decompose the contamination on the surface of the transmission line,and then TiO2 promotes the improvement of the surface morphology of the transmission line,thereby further increasing the corona voltage of the transmission line and the repetition rate of the corona current pulse and the ion current density during the corona discharge are reduced..Based on the experimental results and the Franz-Keldysh effect,the degradation process of the organic matter on the surface of the conductor under different electric fields is simulated by the principle of distributed reaction and Fick’s diffusion law,and the concentration curve of the intermediate product in the degradation process is obtained.It is found that with the increase of the applied electric field,the photocatalytic performance of TiO2 coating on conductor is improved.When the external electric field is low(0-100V),the external electric field improves the photocatalytic performance of TiO2 coating by inhibiting carrier recombination;when the external electric field is high(100v-40kV),the external electric field improves the photocatalytic performance of TiO2 coating by improving the optical utilization of TiO2.The external electric field promotes the generation of holes and the recombination of holes by inhibiting the recombination of carriers and improving the optical efficiency of TiO2,thus promoting the photocatalytic process.Finally,experiments have proved that the electromagnetic environment of high-voltage transmission lines will promote the degradation of organic substances by TiO2 coatings,and as the voltage level increases,the better the photocatalytic performance of TiO2 coatings. |
PDF Full Text Request