Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines

The invention discloses a method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines. By the aid of the method, the problem of highlighted imbalance of three-phase currents of a transmission system due to an existing unreasonable phase sequence arrangement mode of conducting wires of same-tower double-circuit transmission lines is solved. The method includes selecting a phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines according to a tower type used by the same-tower double-circuit transmission lines and lengths of actual circuits, and then computing positive-sequence currents, negative-sequence currents and zero-sequence currents of the two circuits of the same-tower double-circuit transmission lines by an electromagnetic transient calculation process; and respectively computing imbalance degrees of the zero-sequence currents of the I circuit and imbalance degrees of the zero-sequence currents of the II circuit in all the phase sequence arrangement modes of the conducting wires of the same-tower double-circuit transmission lines so as to determine that the phase sequence arrangement mode, which corresponds to the lowest imbalance degrees of the zero-sequence currents, of the conducting wires is the optimal phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines. The method for determining the optimal phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines has the advantages of simplicity and practicality.