Three-dimensional Simulation Of Electric Field For Building Neighborhood Near To EHV Transmission Lines

Our country’s electricity grid has entered a new age, which is extra-high voltage orultra-high voltage, long-distance, and high-capacity with the rapid growth anddevelopment of economic in recent years. However, our country’s energy distributionand load center are uneven distribution, resource and load center are too long, powertransmission corridor can occupy a lot of land area inevitably. And, at the same time,high voltage transmission lines began to appear in the residential area more and more.The power frequency electric field generate from ultra high voltage transmission lineshave harmful impacts or not, which cause widespread public concern. In order to assessultra high voltage transmission lines which cross the building, the power frequencyelectric field near it meet standards or not, it is very necessary to study on the powerfrequency electric field distribution about building near the transmission lines. Thisthesis study on the three dimensional electric field calculation near the building underthe ultra-high voltage transmission lines, analyze the improvement of theelectromagnetic environment. Specific content as follows:①On the base of literature collection and reading，based on the basic principle ofcharge simulation method, in the comprehensive consideration of the transmission linesfactors，such as the span, the sag. A accurate three dimensional calculation model,which describe the relative position of building compare to high voltage transmissionlines. Use of line charge unit model, consider iron tower or not, simulate and calculatethe three dimensional electric field near the building, which is under the high voltagetransmission lines.②Analyze the factors, which affect the power frequency electric field distributionnear building, simulate and calculate the three dimensional electric field under theconditions of different arrangements, different voltage grade, environmental factors,building height and building edge passivation.③Consider the effect of ground wire to electric field distribution and calculatethat. Build different height and different horizontal position shielding lines in thesimulation model, from the calculation results, analyze the shielding effectiveness ofdifferent height and different horizontal position shielding lines. To set up a morereasonable shielded wire, to improve the electromagnetic environment near building, it has a practical value.