The Effect Of Double-Phase Auto-Reclosing Pause Duration On The Reliability And Power Transmission Throughput Under Dynamic Stability

The article up for discusses the problem connected with the accidents of the extra-high voltage aerial line due to its large length. The lines with a voltage of 500-1150 kV, the overwhelming proportion of blackouts is caused by single-phase short circuits, much of which, being unstable arc accidents are conveniently eliminated in a single-phase auto-reclosing cycle. However, a distinct part (approximately 5-10%) is made up of double-phase short-circuits, for the elimination a high-speed three-phase auto-reclosing is usually used. The article aim is the character of dynamic transitions when using high-speed three-phase automatic reclosing and double-phase auto-reclosing of various durations and assesses the level of the transfer capacity of long-distance power transmissions (PT) of the ultra-high voltage according to the dynamic stability. Transition dynamic features in determining the accident can be traced with the help of the angular characteristics of the normal mode, double-phase short circuit mode and automatic reclosing. The main problem which arises when using double-phase auto-reclosing is successful determining the required duration of dead time in each specific projected or operated extra-high voltage aerial line. Another article purpose comparing the performance using high-speed auto-reclosing (HSAR) and double-phase auto-reclosing during two-short circuit eliminating. The article demonstrates the sufficient efficiency of using double-phase auto-reclosing when eliminating double-phase short circuit in a single-circuit aerial line with a voltage of 500 kV.