Analysis of the Electric Field Intensity Nearby High Voltage Transmission Line by FEM
Yan Gan · Gao dianya jishu · 2006
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.