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Prediction Model of Electromagnetic Fields of Extra High Voltage Transmission Lines

Author: HanXingDuo
Tutor: HuZuoMin
School: Northeastern University
Course: Environmental Engineering
Keywords: EHV transmission lines Frequency electric field Frequency magnetic field Prediction model The charge simulation - method of moments Biot - Savart law
CLC: TM723
Type: Master's thesis
Year: 2008
Downloads: 65
Quote: 0
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Abstract


With the rapid development of China's power industry and the constant expansion of the town , many of EHV transmission lines across town , deep into neighborhoods . EHV transmission lines electromagnetic pollution environmental issues more and more attention . Through the analysis of the various types of electromagnetic field calculation , compare , select the charge simulation method , the method of moments , and Biot - Savart law as a derivation of the prediction model of EHV transmission lines electromagnetic environment . Focuses on the basic principles of the charge simulation method and calculation step ; described the structure of the method of moments and the electrostatic field steps based on the weighted residual method ; introduces the basic principles of the Biot - Savart law . Based on the above , focusing on the following aspects : analysis of the shortcomings of the two - dimensional computational model the CIGRE recommended frequency electromagnetic fields , based on the charge simulation - the method of moments consider wire file from the sag frequency electric field three-dimensional calculation of the mathematical model workers dielectric constant and the earth ; EHV transmission lines to consider wire sag frequency magnetic flux density 3D predictive mathematical model is established based on the Biot - Savart law . Permittivity model compared to the calculated and the CIGRE recommended the two-dimensional electromagnetic field , the three-dimensional electromagnetic field model established in this study to consider the earth and the wire shape on the field strength , the distance within the field strength values ??in a file by file from the central attenuation to both sides , while the results of the calculation model of two-dimensional electromagnetic field is a constant value , which indicates that the calculation results of the three - dimensional electromagnetic field model more in line with the actual situation . Prepared for the development of tools to Mathematica EHV transmission lines three-dimensional electric field , magnetic field simulation program , the rationality and practicality of the calculation procedures and verified by actual monitoring data ; EHV transmission line frequency electric field strength and work frequency magnetic induction the influencing factors and lower field strength measures calculated results can provide a reference for EHV transmission project environmental impact assessment work .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Transmission and distribution technology > EHV transmission
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