Study of Very Fast Front Surges in Gas Insulated Substation Due to Switching Operation

摘要

Power system is mainly affected by sudden changes in steady-state values of voltage and current, referred to as the transient phenomena, which are the result of lightning stroke or switching operation. The very fast transient overvolt-ages are generated due to switching operation. This fast front transient seen in gas insulated substation is one of the major concerns for its insulation coordination. In this paper, a 420 kV prototype model is developed and simulated using EMTP software. By operating a disconnector switch, VFTOs at various locations are analyzed. The severity of VFTOs is also analyzed by considering the trapped charge.