Study on Electromagnetic Environment for 1000kV AC Transmission Line

“Jing Cheng-Nan Yang-Jing Zhou 1000kV AC pilot project” and “Huai Nan-Wu Hu-Shang Hai 1000kV AC project” of SGCC are the major projects of UHV grid on the stocks in our country. Based on summarizing the abroad and domestic research results of electromagnetic environment for UHV power transmission line, and combined with the calculation and analysis of electromagnetic environment parameters for major tower and conductor type of preliminary design of UHV power transmission line in China, the suggestions for parameters indexes control of electromagnetic environment for 1000kV power transmission line such as power frequency electric field, power frequency magnetic field, radio interference and audible noise were put forward. The limit of the electric field strength is determined as follows: 1) The limit for the area that people can be easily come to and the road that overhead line crossed is 7 kV/m; 2) The limit for the farm field that overhead line crossed is 10 kV/m; 3) The limit for the area near the domestic structure is 4 kV/m; 4) The designed value for the radio interference is 55-58 dB; 5) The designed value for the audible noise is 55 dB.