Research On The Model And Analysis Of Catenary Electromagnetic Environment

With the rapid development of high-speed railway in China,electromagnetic environment along the high-speed railway catenary and especially the area of high-speed railway station platform where there is a high passenger flow volume has already attracted a lot of academic attention.In order to evaluate whether electromagnetic environment on platform of high-speed railway meets the standard of power frequency electric field by International Commission on Non-Ionizing Radiation Protection(ICNIRP),it is necessary to study the distribution of electric field on the platform.According to the calculation principle of electromagnetic field and finite element theory in electromagnetic field of transmission lines,mathematical model of electric field around catenary wires is established by ANSYS and influence on distribution of electric potential and electric field by applied different boundary conditions is compared and analyzed,while refinement of finite element mesh is discussed and impact on accuracy of numerical calculation by different density of the mesh is considered.In the end,electric field intensity of island-platform and side-platform is calculated respectively when the influence of building and trains is considered.The main work and conclusions are as follows:(1)As to the problem of calculating infinite electric field intensity around the contact wire,the infinite field is transformed into a finite field when INFFN110 and artificial truncation boundary are used to be boundary conditions respectively.The result shows that computational accuracy of INFIN110 is higher than artificial truncation boundary.(2)To question of' the existing of'big size area and small size element' among the catenary,the mesh density is increased by grid remeshing and local refinement.The result shows that the computational accuracy is not proportional to the mesh density.(3)Considering the impact of building and train,calculation model which the relative position of building,trains and contact wires is described precisely is established.The result shows that trends of measured data simulation results in this paper is similar.Thus,feasibility of calculation model is verified.(4)On the authority of the distribution of electric field in platform area,electromagnetic environment of public area on platform is evaluated reasonably and he corresponding recommendations and protective measures are proposed.