Prediction and evaluation of electromagnetic environment of UHV 1000kV single-circuit transmission line
In order to smoothly promote the construction of UHV 1000kV transmission line,reduce the impact of the project construction on the surrounding electromagnetic environment,and reduce the environmental complaints of the public around the project.The typical single-circuit poles and towers of UHV 1000kV single-circuit transmission lines are predicted and the electromagnetic environment impact during operation is analyzed.The prediction results show that when the minimum distance between the conductor and the ground as required by the design code passes through the sparsely populated non-agricultural farming area,it is necessary to increase the distance between the conductor and the ground to 22 meters,and the power frequency electric field intensity at a height of 1.5 meters from the ground below the line can meet the relevant requirements in the Controlling limits for electromagnetic environment(GB8702-2014).When the minimum distance between the conductor and the ground as required by the design specification passes through the agri-cultural farming area,the power frequency electric field intensity at a height of 1.5 meters from the ground below the line can meet the relevant requirements of the Controlling limits for electromagnetic environment;When the line passes through residential areas,the minimum distance from the conductor to the ground needs to be raised to 39 meters,and the power frequency electric field intensity and power frequency magnetic induction intensity at a height of 1.5 meters from the ground at 7 meters below the line and outside the line side conductor can meet the public exposure control limit require-ments in the Controlling limits for electromagnetic environment(GB8702-2014).In addition,it is suggested that the UHV 1000kV single-circuit transmission line should be as far away from residential areas as possible during the site selection stage;Increase the distance between the conductor and the ground in the design and construction stage to reduce the im-pact of the UHV transmission line on the surrounding electromagnetic environment.
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