| With the gradual expansion of China’s urban scale and the increasing demand for power load,transmission line corridors are becoming increasingly scarce.Using Multi-circuit transmission lines can effectively improve the transmission capacity of unit line corridor,which can meet the requirements of both power grid construction and local development planning.Due to the construction of high voltage transmission lines in densely populated areas,the electromagnetic environment of high-voltage transmission lines often lead to fear psychology of nearby residents,and even causes them to resist the power construction.Therefore,it is necessary to study the electromagnetic environment of power transmission line.The electromagnetic environment parameter of transmission line includes four aspects: power frequency electric field,power frequency magnetic field,radio interference and audible noise.In the second chapter of this paper,the theoretical calculation methods are researched,and the relevant national standards are introduced.According to the theoretical calculation method of transmission line electromagnetic environment,this paper developed the electromagnetic environment calculation software of transmission line by Matlab programming in the third chapter,and analyzed the influence of phase arrangement of 110 kV same-tower six-circuit transmission line and 220 kV same-tower four-circuit transmission line on electromagnetic environment in the fourth chapter.The key factors that influence the optimal phase sequence arrangement are obtained,and the optimal arrangement of phase sequence is obtained by using sorting method.At the same time,the field-frequency electric field,power frequency magnetic field and radio interference of 110 kV same-tower six-circuit transmission line and 220 k V same-tower four-circuit transmission line are measured on-site,and the distribution of the measured data is obtained by using curve-fitting method in Matlab and compared with the theoretical data. |
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