The Transmission Line's Power Frequency Electric-Field Assessment Software Development

With our country accelerating development of electric power,the electromagnetic environment which surround the power transmission and transformation project attracted much attention,and the demands of the electromagnetic environment become more strictly.According to the consulting and learning of a vast amount of domestic and foreign literature,we can know that the power frequency electric field is an important factor which is greatly influenced by the environment.For the convenience of the staff evaluating the frequency electric field which under the transmission lines,this article studied the distribution of power frequency electric field in different scene,developed the assessment software which is about the frequency electric field of transmission lines.Firstly,the charge simulation method is adopted as the main calculation method of power frequency electric field cal.We improved the charge simulation method by combining point charge with linear charge,and deduced the formula which was suitable for the power frequency electric field calculation of transmission line in different scene.This article simplified the model of the slopes,buildings,trees which under the transmission line,selected the length of line charge unit is 0.5m and the point charge density is 0.5 m.Simulating the electric field distribution which around the hill,and found the main factors influencing the electric field distribution were the slope toe and the relative position of the slope with transmission line.Modelling the building according to relevant regulation,simulating the electric field distribution of the 1.5m plane and at the top surface of the building.Found the maximum distortion electric field at 1.5m plane less than 4kV/m,the wall shielding the internal electric field.At the top surface of the building,the distortion electric field achieve 8.1224 kV/m,the value over the maximum electric field 39.1% which under the transmission line.Selecting crown radius is 4m of the tree model and simulating the electric field distribution,found that the power frequency electric field which under the trees had weakened 96%.Arranging the trees around the building,found that the trees weaken the distortion of electric field which around the building significantly.Secondly,by analyzing the shortage of electromagnetic field simulation software in calculating the power frequency electric field distribution of transmission line,such as EFC-400,CDEGS and so on.Determining the scene modeling module,data processing module,output module,optimization calculation module as the main function modules of the software.Selecting the WPF of the.Net Framework4.0 to design the Software interface,and the MATLAB procedure as the core calculation procedure of the Software.By the C # language programming,calling the MATLAB procedure to realize the arrangement of simulate charge and the electric field calculation.At the same time,calling the drawing software Surfer to realize the output of the calculation results in the form of plane contour map,3 d surface figure.Finally,this article simulated the power frequency electric field distribution of variety of model which under the transmission line at different position.Output the calculation results in the forms of plane contour map,the 3D surface figure.Reflecting the electric field distribution intuitively,it's more convenient to evaluate the electromagnetic environment.