Study on the characteristics of the potential rise of shell under VFTO in the GIS pumped storage power station

Compared with the traditional GIS station, complex wiring and operation mode of pumped-storage plant diversity, working condition frequent transformation, makes to produce very fast transient overvoltage (VFTO) probability increase greatly. VFTO will form a coupled shell casing earth voltage (TEV), then station personnel safety reliability secondary equipment poses great threat. But at moment because limitation testing technology such as understanding academic study TEV is lack system. Based on typical 500 kV gis power this paper established system equivalent model GIS, network frame calculates amplitude, frequency spectrum characteristic influence characteristics, analyzes fault location, supply mode, branch bus, vertical grounding electrodes For characteristics rules parameters. Research pumped storage has important reference value for further perfecting relevant theories.