One-Terminal Impedance Fault Location Algorithm for Single Phase to Earth Fault of Transmission Line

Considering that the single-phase to earth fault is the main fault type on overhead transmission lines, the single-phase reclosure (SPR) scheme is applied widely to improve the stability of power system in China. Utilizing one-terminal post-fault measurements before the faulty phase is tripped and the measurements of the sound phases when the tripped faulty phase is waiting for SPR, the fault resistance and remote end source impedances can be calculated exactly, and a novel one-terminal impedance fault location algorithm based on SPR for the single-phase to earth fault is presented. By using alternative transient program (ATP), a distributed parameter line model based on the real transmission system parameters is employed for demonstrating the effectiveness of the new method, and the simulation results have shown the good performance of the proposed algorithm.