| In recent years,China’s economy has entered a stage of rapid development,and economic development puts forward higher requirements for transmission capacity.With the rapid expansion of urban scale,500 k V EHV transmission projects cross towns or residential buildings from time to time.Therefore,the impact of power frequency electromagnetic field of high voltage transmission line on the public has become the main concern of domestic scholars.At present,the research on power frequency electromagnetic environment safety assessment under UHV transmission line is mostly based on numerical simulation,and there is less research based on field measurement.The main research contents are as follows:Firstly,the development trend of power frequency electric field limit of EHV AC transmission line is analyzed,and the research status of power frequency electric field numerical calculation of EHV AC transmission line at home and abroad is summarized;This paper expounds the characteristics of power frequency electric field of EHV AC transmission line,and introduces the Three-dimensional Modeling Software Solidworks,the principle of electromagnetic field finite element analysis and the finite element analysis software ANSYSSecondly,four typical 500 k V AC transmission line tower simulation models are established,and the calculation program is written in APDL language to improve the calculation efficiency and take into account the accuracy.The cloud map of electric field distribution near each tower insulator string is obtained,and the field strength on the typical path during equipotential operation and the electric field distribution at1.5m below the ground under different tower types are analyzed,The calculated results are compared with the relevant standard limits.Finally,the electric field intensity on the 1.5m horizontal plane of the ground of four kinds of towers is measured in the field.The measurement results are basically consistent with the simulation results using the three-dimensional finite element method,and the distribution law and change trend of power frequency field intensity under the same tower type are consistent.It is verified that the Solid Works tower model is used in this paper,and the conductor model is parameterized by ANSYS program,The feasibility of calculating the electric field distribution around the tower and the line in ANSYS environment is discussed;At the same time,the causes of the errors are analyzed,which provides support for improving the accuracy of the simulation results.It can be gradually explored and compared in the subsequent simulation process,taking into account the efficiency and accuracy of calculation,and continuously optimize the model. |
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