Optimization and Application on Reclosure of Line-line Strings with 3/2 Connection Mode in 220kV System

The reclosure of line-line strings with 3/2 connection mode in 220kV system is normally just set as single-pole reclosure. If one of the lines in the same string is transmission line of electrified railway Traction Substation, whose reclosure of side circuit breaker is set as three-pole reclosure. Power supply realiability of correspongding line will be greatly reduced on account of the reclosure difference when any side circuit breaker is in maintenance. Herein above statement, the risk of current reclosure mode is analysed firstly, and then different optimization schemes are put forward to eliminate the risk. Finally, the most optimal scheme is determined by comparison between different schemes to ensure power supply reliability.