| Title |
A Study on Reclosing Decision on 154kV Combined Transmission Lines |
| Authors |
정채균(Jung, Chae-Kyun) ; 박흥석(Park, Hung-Sok) ; 강지원(Kang, Ji-Won) ; 이종범(Lee, Jong-Beom) |
| Keywords |
154kV combined transmission line ; EMTP ; Reclosing ; Trap charge |
| Abstract |
This paper describes switching surge analysis on reclosing decision in 154kV combined transmission line with power cables. Reclosing should be operated in combined transmission line based on the technical evaluation because of insulation problem of power cable section. If the surge strikes on power cable, the breakdown can occur at week point of cable insulation. Therefore the detailed analysis is required by considering several conditions such as length ratio of power cable, arrester, fault resistance, charging rate and grounding resistance, etc.. In addition, sheath voltage on IJ(Insulated Joint) is analyzed to confirm the protective level. Simulation is performed by EMTP/ATP. Analysis results show that reclosing can be operated without any special problem by the single line-to-ground fault with fault resistance of 1Ω to 50Ω occurred at the overhead transmission section in 154kV combined transmission lines and trap charge of 100% and 110%. |