【摘要】 为准确得到实际建筑物及其周围场强分布,应用三维有限元法分析高压架空线路附近建筑物及其邻近区域中的电场分布。采用的模型考虑了高压架空线和实际建筑物(即建筑物墙壁、楼层间钢筋等)结构,并用六面体单元剖分整体模型以减少三维模型单元数量和提高计算精度。再应用子模型法校核计算结果的准确性,然后分别计算空间中有建筑物时房屋顶部和内部和无建筑物时同样位置的电场分布。最后讨论建筑物对其外部电场的畸变作用及对其内部电场的屏蔽作用。结果表明:架空线路附近的建筑物会改变空间电场分布,且建筑物附近电场强度的最大值出现在建筑物外廓尖角处。更多还原

【Abstract】 In this paper, the electric field intensity of the building and its surrounding area nearby high voltage transmission line is analyzed by FEM. The two dimensional model which was widely used in analysis of the electric field distribution is not useful because of the electric field intensity of the area around and inside the actual building should be discussed. Different from the former methods which discussed the electric field distribution without the simulation of the building, both of the high voltage transmission line and the actual building are taken into account in the calculation model. The wall and the reinforcing steel bar between different floors are simulated in the actual building models . The reinforcing steel bar is modeled by coupling the voltage of the discrete point on the bar. In three dimensional simulation, the most important thing is to minimize the calculation scale while satisfy the calculation accuracy. Hexahedral elements are adopted to minimize the number of the total elements and to enhance the calculation precision. The mesh of the building and its surrounding area should be carefully controlled for the electric field intensity change sharply in this area. Since it is hard to testify the calculation result by increase the mesh density of the whole region, submodeling method is introduced to verify the accuracy of the result. The calculation results were compared with those where no building exist nearby the high voltage transmission line. The distortion of the electric intensity nearby the building and the shielding effect of the structure in the inside area of the building are discussed. The calculation results show that the simulation method is useful in estimating the electric field intensity around the building and is helpful in the layout of the transmission line.更多还原