Analysis of a switch fault in a 1000 kV ultra-high voltage substation

This paper analyzes a fault in a 1000 kV ultra-high voltage gas-insulated switchgear (GIS) during the re-energization operation of Line XⅠ at a UHV substation. The analysis highlights assembly process defects (e.g., insufficient screw torque) and uncalibrated opening positions as primary contributing factors. By reconstructing the event and analyzing its mechanism, this study provides critical insights for optimizing UHV equipment maintenance and manufacturing processes.