Study on Intermittent Discharge Characteristics of Typical Defects in GIS Under Different Vibration Conditions

The omission and false alarm of partial discharge insulation defect of gas insulated switchgear (GIS) seriously affect the safe and stable operation of GIS. Considering that GIS may be affected by various vibration factors in actual operation, this paper builds an intermittent discharge test platform for shock and vibration superimposed multi-source detection, and carries out experimental research on the characteristics of intermittent discharge under different vibration conditions for common internal typical insulation defects in GIS. The study found: The vibration state has a certain influence on the intermittent discharge of defects in GIS equipment, and the intermittent discharge law in the nonvibration state is consistent with that in the normal operation vibration. However, the insulation strength of metal particle defects decreases greatly under shock vibration, and with the continuous discharge process, the discharge interval develops from seconds to milliseconds, from intermittent discharge to continuous discharge. The research results are of great significance for broadening the understanding of intermittent discharge characteristics and promoting the field GIS discharge defect detection.