Waveform Similarity-Based Robust Pilot Protection for Transmission Lines

This paper proposes a robust pilot protection scheme based on waveform similarity that restricts the influence of outliers in fault line identification. By comparing two refactoring currents constructed using time-domain sampling values at terminals transmission line, algorithm called Kendall's Tau coefficient (KTC) is employed to distinguish different datasets protected line. A reliable identification realized under types, distances, and resistances. Proposed criteria are against current transformer saturation, synchronization error, noise proposed. The KTC simply rank order instead metric value thus limits moderate level, ensuring safety cases where cannot be eliminated completely included waveforms. simulation results demonstrate excellent performance proposed scheme.