Research On The Electromagnetic Environment Of Mixed-Voltage Quadruple-Circuit Transmission Line On The Same Tower

With urbanization and Industrialization with Chinese characteristics During the The "Twelfth Five Year plan", urban population dramatic increase and urban areas rapid expansion. Contradiction between high-voltage transmission line construction and urban land use planning have become increasingly prominent. Mainly reflected in the lives of the residents work the land use conflicts and high-voltage transmission line corridor, The electromagnetic environment of high voltage transmission lines are high-voltage lines line corridor decide the most important factor, So the electromagnetic environment has become the most important issue is now restricting the development of transmission of high-voltage lines.In this paper, 500/220 kV mixed four circuit on the one tower transmission line from Yueyang power plant to Kunshan and Yueyang power plant to Yishui was select in an actual project. a three-dimensional electromagnetic field calculation model of Transmission Line was established according to the catenary equation, The charge simulation method and moment method was combined to calculate the electrical field below the cross-wire, the magnetic field below the cross-wire was calculated by Biot-Savart theorem. Analysis of the influence of on the same tower four-circuit transmission line power frequency electromagnetic fields below the line when different lead on the ground heights, different phase sequence and whether the ground. a radio interference and audible noise two-dimensional calculation model which Consider ground and ignore the sag was established. The empirical method which recommended by CISPR and suitable for use in engineering was used to calculate radio interference. The prediction method which recommended by BPA was used to calculate Audible noise. Analysis of the influence of on the same tower four-circuit transmission line radio interference and Audible noise below the line when different lead on the ground heights,different phase sequence and different weather. Finally compared with the calculated data and the actual measurement data, Verified the accuracy of the model calculations, and proposed the method to improve the electromagnetic environment.The situation of high voltage transmission lines across low voltage transmission lines was Inevitable in an actual project, In this paper, a three-dimensional electromagnetic field calculation model of cross-wire was established, Analysis of the influence of the power frequency electromagnetic field distribution of space crossed transmission lines on 500/220 k V mixed four circuit on the one tower when different phase sequence and different crossing angle. The data show that power frequency electromagnetic fields below cross-wire is big than cross-wire's. Therefore, the frequency electromagnetic field shielding has be research in the paper, then,proposed the method of improve the power frequency electromagnetic field below cross-wire.