Investigation of the secondary arc current and the recovery voltage on a double-circuit transmission lines

With the development of the power system, the double-circuit lines on the same pole are more and more widely used in a UHV (EHV) AC transmission system. Because of a coupling of the double-circuit lines, the values of the secondary arc current and recovery voltage on double-circuit lines are higher than that of the single-circuit lines. These will affect the possibility of successful single pole autoreclosing. The methods that reduce the magnitude of secondary arc current and recovery voltage should be used to ensure the successful autoreclosing. In this paper, the formulas of calculating the secondary arc current and the recovery voltage on double-circuit lines on the same pole are presented, and the factors affecting the secondary arc current and the recovery voltage are discussed. Using EMTP, calculated the secondary arc current and the recovery voltage of a double circuit lines on the same pole. The simulation results were in accordance with the theoretical analysis.