Research on Electric Field Distribution and Shielding Measures for Houses near a 1000 kV UHV AC Transmission Line

In recent years, UHV AC/DC transmission projects in China have developed rapidly, and transmission line corridors have become increasingly limited. As a result, UHV AC transmission lines are increasingly located near areas where residents live and work, and the electric field distribution around houses near transmission lines has become a major public concern. To further investigate the electric field around houses near UHV transmission lines, a full-scale house platform was constructed near an actual operating 1000 kV AC transmission line. The electric field distribution above the house platform and around the house was systematically measured and analyzed. The effects of house height and the distance between the house and the transmission line on the electric field distribution were discussed, with emphasis on the electric field distribution on the two-story platform. In addition, the shielding effect of shielding wires installed near the house on the electric field of the house platform was analyzed. The results show that the electric field on the two-story platform is significantly higher than that on the single-story platform, and the electric field decreases approximately linearly with distance. Installing shielding wires can effectively reduce the power-frequency electric field intensity on the house platform. A relatively optimal balance between shielding performance and installation economy can be achieved when the shielding wire is installed along the edge of the house, with a length 3 m longer than the house edge and a height 1.5 m higher than the position to be shielded. A reasonable combination of multiple shielding wires provides a much better shielding effect than a single shielding wire.