The Research On High Voltage Transmission Line Electromagnetic Environment And The Biological Effects Of Human

With the development of the socio-economic, the improvement of people’s living standards, the continuous growth of electricity demand, the grid size and distribution patterns have undergone significant changes currently. Grid voltage level has been raised from the high voltage (110-220kV) to EHV (500kV), and even UHV (1000kV), which will lead to the increase of the electromagnetic fields around the transmission lines, and the electromagnetic environment will deteriorate. Meanwhile, in order to improve the quality of power supply, an increasing number of transmission lines close to or even being in populated areas, people feel worried about the electromagnetic environmental issues and the biological effects that may be caused by high-voltage transmission lines.The report of the media have made tremendous psychological pressure, so the electromagnetic environment issue has been an important factor which restricts the development of UHV AC transmission. And compared with HV, EHV transmission lines, UHV have large differences in voltage levels, line structure, conductor type, operating environment and others, Some of the original research is not sufficient to accurately assess the electromagnetic environment and the biological effects of UHV AC transmission lines.In this context, we study the 1000kV UHV transmission lines, and make a detailed simulation study about the electromagnetic environment and biological effects of the transmission lines. We hope the simulation results of this paper could provide some suggestions and reference for the optimal design of UHV AC transmission lines, and eliminate excessive fear of the public about electromagnetic pollution produced by UHV transmission.The main research results:(1)In terms of electromagnetic environment, firstly, we study several calculation methods (finite difference method, the charge simulation method, finite element method, etc) about electromagnetic fields around the transmission lines, and analyze and compare the advantages, disadvantages and application of different algorithms. Secondly, we establish a two-dimensional electromagnetic model of UHV AC transmission lines, and analyze the general distribution and variation of electromagnetic fields intensity by matlab simulation, and focuses on the electromagnetic field intensity distribution of the UHV transmission lines when the phase conductor spacing, split wire structure, phase conductor arrangement and the distance from the ground change.(2) In terms of biological effects, according to the physiological structure of the human body, we construct a model of the human body which can calculate electromagnetic effectively, and this model can mimic the human internal electromagnetic properties effectively. Based on the above models and using the combination of numerical methods and analytical methods, we could analyze the electromagnetic field distribution and electromagnetic energy of human body by the electromagnetic field simulation software ANSYS. Meanwhile, analyze the main factors that affect the human body’s electromagnetic field distribution, and summary the variation of the human body electromagnetic field distribution in the case of different voltage levels, different current levels, different distance relative to the ground, different transmission modes and different structures of transmission lines. Finally, based on the simulation calculation results, conclusions and current safety standards, we analyze the relationship between human health and UHV transmission lines in terms of the thermal effect and non-thermal effect.