Research On The Electromagnetic Environment Of 500kV Quadruple-circuit Transmission Line On The Same Tower

The electromagnetic environment of 500kV quadruple-circuit transmission line on the same tower is calculated and analyzed, including power frequency electric field, the line corridor, power frequency magnetic field, radio interference (RI) and audible noise (AN). And the effects are discussed in detail. The measures to improve the electromagnetic environment are proposed. By taking electric field, magnetic field, radio interference and audible noise into account, the optimal phase sequence arrangement for 500kV quadruple-circuit transmission line on the same tower is obtained. At last, the electric field distortion on the roof and the balcony is calculated and analyzed when transmission lines pass over the buildings, and the secure distance of quadruple-circuit transmission line on the same tower is also calculated.The results show that the electric field is the key issue of quadruple-circuit transmission line, which mostly determines the optimal phase sequence arrangement and secure distance between buildings and transmission line. Elevating the line height, installing additional shield wires and some other methods can effectively minimize the magnitude of electric field below the transmission line, making the electric field within the secure limits. The calculation method and results can be referred to for projects.