| Title |
Effects of Reclosing for Insulation Coordination in 345kV Combined Transmission Lines |
| Authors |
이종범(Lee, Jong-Beom) ; 정채균(Jung, Chae-Kyun) ; 임광식(Lim, Kwang-Sik) ; 강지원(Kang, Ji-Won) |
| Keywords |
345kV combined transmission line ; Insulation coordination ; Pre-insertion resistance ; Reclosing ; Sheath Voltage |
| Abstract |
This paper describes switching surge analysis for reclosing decision in 345kV combined transmission line with XLPE power cable. Reclosing operation should be decided based on the detailed technical analysis in combined transmission line because this line includes power cable section which is week on insulation. Insulation of power cable can be breakdown at the week point in case of reclosing moment. Therefore the detailed analysis has to be carried out by considering several conditions such as length ratio of power cable section, arrestor, inserting resistance, charging rate, grounding resistance, etc.. On the other hand sheath voltage on IJ(Insulated Joint) is analyzed to check dangerous condition on cable cover. Analysis is performed by EMTP/ATP. Analysis results show that reclosing can be operated as the single line-to-ground fault occurs on overhead line in 345kV combined transmission line, if the inserting resistance is considered before the operation of main circuit breaker. |