Abstract
Aiming at the overvoltage of the equipment in GIL-GIS system when the tower outside the station strikes back, a calculation model based on EMTP program is proposed to analyze the influence of GIL distance length, lightning tower position and tower name on the lightning inrush overvoltage. Combined with the calculation results, it shows that the lightning inrush overvoltage level varies with GIL distance length, lightning tower position and tower name The variation law of tower nominal height can provide reference for overvoltage calculation and electromagnetic disturbance source calculation of hydropower plant.
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