Title :
A Dual-Window Transient Energy Ratio-Based Adaptive Single-Phase Reclosure Criterion for EHV Transmission Line
Author :
Lin, Xiangning ; Liu, Haifeng ; Weng, Hanli ; Liu, Pei ; Wang, Bin ; Bo, Zhiqian Q.
Author_Institution :
Three Gorges Univ., Yichang
Abstract :
A criterion of dual-window transient energy ratio (ER) to improve the adaptability of the self-adaptive autoreclosure of transmission line is proposed. The redundancy of setting of the criterion can be enhanced in comparison with the criterion of single-window transient energy. To effectively extract the high-frequency energy of the voltages, a novel concept of close-opening - open-closing morphological gradient (COOCG) is put forward. Compared with the multiresolution morphology gradient transform, COOCG has a lower unbalanced output when processing the steady-state signal; therefore, the threshold of ER can be lowered to improve the successful rate of fault discrimination. EMTP-based simulation results show that the COOCG-based autoreclosure scheme improves the reliability of discrimination and is promising to be used in the real power systems.
Keywords :
EMTP; fault diagnosis; gradient methods; high-voltage techniques; power system simulation; power system stability; power system transients; power transmission protection; EHV transmission line; EMTP; close-opening open-closing morphological gradient; dual-window transient energy ratio; fault discrimination; multiresolution morphology gradient transform; power system simulation; self-adaptive single-phase reclosure criterion; Energy resolution; Erbium; Power system reliability; Power system simulation; Power system transients; Power transmission lines; Redundancy; Signal resolution; Transmission lines; Voltage; Close–opening-open–closing morphological gradient (COOCG); dual-window energy ratio; mathematical morphology (MM); permanent fault; self-adaptive reclosure; transient fault;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2007.905346
