Research On The Impact Of EHV Transmission Line Electromagnetic Property On Built Environment And Shielding

With the development of power industry, the capacity of grid is becoming larger and larger, transmission distance is also farther and farther, and the newly built transmission lines gradually approaches the densely populated regions. The corona phenomenon near high-voltage transmission lines and substations, and the hazards that strong electromagnetic fields may have to humans, animals, ecological environment have gradually drawn widespread concern. A variety of reports from different media about electromagnetic pollution caused injury to human body and objects also make the electromagnetic environmental issues become one of the important factors that influence the development of EHV transmission.On the basis of research on domestic and international transmission lines electromagnetic properties and the dynamic development of electromagnetic shielding, according to the three-dimensional electromagnetic finite element theory and electromagnetic field calculation principle of EHV transmission lines, through making use of software, we realize the experimental simulation on electromagnetic field distribution and shielding effectiveness of metal shielding body to frequency magnetic field near transmission lines, which includes the electromagnetic field distribution near transmission lines without buildings, the electromagnetic field distribution inside buildings near transmission line, the change of electric field distribution inside buildings near transmission line as the building materials, window size and window direction differ, as well as the magnetic field distribution inside buildings under different thickness and material of shielding body, etc. To objectively evaluate the shielding effectiveness of shielding body, the electromagnetic shilding comprehensive indicators are built which can reflect shilding effectiveness, weight and economy, the three aspects of performance for shilding body, to meet the choice of shielding scheme under different focuses. The study of this paper has important guiding significance and application value to the analysis and choice of shilding scheme for the buildings surrounding transmission line.