A new approach for the estimation of interference phenomena between coupled transmission lines

The low frequent electromagnetic mutual coupling of electric high voltage lines leads to a variety of effects in the planning and the operation of such an electrical circuit and their impact onto other line circuits (e.g. telecommunication and signal lines). The authors present a new method for calculating the interference phenomena between inductively coupled circuits. These calculations are performed with the help of the combination between the node potential method and a chain-ladder model under consideration of inductive coupled conductor arrangements. So it´s possible to calculate the inductive influence, asymmetric currents (zero and negative sequence currents) of extended transmission line circuits under normal and faulty operation conditions. Calculations and results of the optimization of transposition schemes and phase configurations of a transmission line section in Austria will be presented. This method allows an optimization of the phase configuration (twisting) concerning inductive and ohmic interferences under consideration of economic and practical aspects.