Research on Defect Pattern Recognition of GIS Equipment Based on X-ray Digital Imaging Technology

In this paper, the experimental platform composed of Computed Radiography (CR) imaging system and Gas insulated switchgear (GIS) model is established to carry out the gas dissociation and withstand voltage test of SF 6 gas under different tube voltage levels. Taking the loosening of metal screws in the grading shield as an example, the GIS defect type is irradiated by X-ray. Then a typical defect library with three levels of defect: general, severe and critical is established. Meanwhile the corresponding identification criteria belongs to image defect is offered. The experimental results show that the composition and withstand voltage of SF$_{\mathbf {6}}$ gas in GIS equipment are unaffected by the X-ray irradiation. In addition, X-ray digital imaging technology can effectively diagnose the internal defects and realize visual detection of GIS.