Research on Secondary Arc Current and Recovery Voltage of 500kV Overhead Line-GIL Hybrid Transmission Line

In this study, ATP-EMTP program is used to establish a power grid simulation model based on 500 kV overhead line-GIL hybrid line. The secondary arc current and recovery voltage are studied when the single-phase grounding fault point is located in the overhead line section or the GIL section. The secondary arc current and recovery voltage levels along the transmission line are obtained. The shortest reclosing time of transmission line under the fault type of single-phase grounding is proposed. It is suggested that the high speed leakage current device can not be installed on both sides of the GIL in the 500 kV overhead line-GIL hybrid transmission line project.