Reproduction Methodology for Single Phase-to-Ground Faults in Overhead Transmission Lines

Reproducing key fault information quantitatively has practical significance for the fault diagnosis of overhead transmission lines (OLTs). In order to reproduce the key fault information of a single phase-to-ground (SPG) fault, this paper proposes a reproduction methodology based on the waveform inversion theory and the propagation characteristics of a traveling wave. Based on the frequency-dependent parameter model and the inversion technique, the current traveling wave at the fault point can be obtained. The fault reproduction model was then created based on the wave propagation characteristics and the obtained waveforms at the fault point. The proposed method adopted a chaos particle swarm optimization algorithm to realize a fast search of the solution space, and this contributes to accurately reproducing the fault angle and the fault resistance of a SPG fault. The simulation results demonstrate that the method proves suitable for reproducing the key information at the fault point. In addition, the proposed method was implemented in 500-kV OTLs, which could help to provide data support for fault diagnosis and insulation protection.