Non-contact fault location and identification method for same-tower multi-circuit transmission lines

Abstract

Fault identification and location of the multi-circuit transmission line can ensure the safe and stable operation of the power system. The existing contact method is difficult to install and maintain, and the cost is high. This paper proposes a novel non-contact fault identification and location method, which addressed the aforementioned limitations by using fewer magnetic sensors and making the method suitable for multi-circuit transmission lines. First, a magnetic array with fewer magnetic sensors is constructed based on electromagnetic effects, and a current reconstruction method is determined. Second, failure current characteristics have been determined. Then use the reconstructed current and magnetic field combined with the fault current characteristics to identify and locate the fault. Finally, the double-circuit transmission line was simulated on Ansys Maxwell and Matlab, and an experimental platform was established to verify the effectiveness of the method.