High-speed superimposed-based protection of series-compensated transmission lines

摘要: This study presents a sub-cycle power frequency-based fault direction discrimination and classification algorithm for the series-compensated transmission lines. Also, it provides an accurate estimation occurrence instant which is helpful in synchronised waveforms-based pilot protective schemes. The proposed based on capturing initial change voltage current waveforms caused by of fault. high-frequency components signals are first filtered out, then sampled at relatively low sampling rate. Unlike conventional relative-phase-angle-based directional relays, not affected inversion phenomena due to presence series capacitor loop. Extensive simulation studies performed evaluate performance. obtained results show that simple very fast reliable protection technique also covers non-compensated lines able well discriminate even if post-fault amplitude becomes too small. It tested using some real data recorded from high-voltage system.