Research on the electromagnetic environment of 220kV four circuits on one tower transmission line

With the rapid development of electric engineering in our country,the electric grid becomes more and more compact.The right way of power transmission line and the used area become important problems to the power transmission line constructing.Using CDEGS software package,the electromagnetic environment under 220 kV four circuits on one tower transmission line was simulated.The power frequency electric field and magnetic field,radio interference(RI) and audible noise(AN) were examined systematically under different conductor arrangements.The line corridor width was determined according to the limit of power frequency electric field,and typical arrangement of conductors was recommended and measures to reduce the electric field were proposed.In the end,it is concluded that the power frequency electric field is the main factor affecting the electromagnetic environment of such transmission line.