Simulation And Analyse Of Power-Frequency Electromagnetic Field's Influence On Environment

In order to meet the needs of power consumption, power industry has been growing fast these years. Total generator's volume has been increased and what's more, the building of power grid is enhanced greatly. With the growth of power industry and human cities'expanding, high voltage headlines have appeared near cities and towns. Some have already crossed towns. The influence of power-frequency electromagnetic field is being concerned by both the residents nearby and the whole society.Power-frequency electric field has always been the emphases. In order to know the distribution of power-frequency electric field, many academicians have done a lot of research. In this paper, old models have been analysed. Most of them used the method Charge Simulation Method (CSM) to build a 2-D models, which is easy to be understood and through it, a very good result can be obtained. Among these models, some considered headline as unlimited line charge, some considered headline as catenary for the reason of its arc, other introduced buildings into the models. The models are getting more and more complex and close to real situation, but all of them are calculated using 2-D arithmetic and the results can not describe 3-D electromagnetic field. For this reason, a model using 3-D electric field arithmetic is built with a building in.Through this model, 3-D distribution of power-frequency electric field has been obtained. As a result, buildings can shield the power-frequency electrical field near the ground, but on the top of buildings, such as roof and terrace where people can also appear, the power-frequency electric field is far stronger. Around the corners of buildings, there can be aberrance. These results are very important for correctly evaluating and meaturing power-frequency electrical field.MATLAB is one of the most useful calculating and simulation tools and it provides powerful maths and figure function libraries. Using these libraries, all kinds of commercial algorithmic functions can be utilized and very good simulation figures can be obtained. In this paper, the power-frequency electrical field simulation software has been designed by introducing MATLAB C\C++ function library. The interface of the software is programmed through VC++. Using these tools and methods, the algorithmic veracity can be guaranteed and 3-D view of simulation result can be realized, what's more, the period of developing a softwore can be reduced.Using the simulation software above, the electric field of several real lines has been calculated and simulated. Then several facts such as the height, disposal, oprating patterns and numbers of divisived leads which influence the electric field have been analysed. Then, the power-frequency electrical field inside the buildings and the power-frequency electric field shielding by plant and shield lines have been discussed. Several measures to reduce power-frequency electrical field, such as optimizing operating patterns and disposal, increasing line height, reducing numbers of divisived leads and distance of lines, using mixed lines and shielding measures have been given.High voltage headlines also generate magnetic field. In this paper, a model has been established to calculate the magnetic field. Compared with the criterions of magnetic field in several countries and international organizations, power-frequency magnetic field is far smaller than the limits in these criterions. A lot of magnetic field generated around people has been given and compared with power-frequency magnetic field. The result shows that power-frequncy magnetic field is far smaller than other magnetic fields generated by electrical equipments and industrial equipments. Based on the experiments and research results of the power-frequency magnetic field influence on human health, the view that power-frequncy magnetic field endanger human health is not correct.