Journal
ENERGIES
Volume 11, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/en11020318
Keywords
in-service glass insulator; icing condition; image processing; convexity defect; graphical shed spacing; graphical shed overhang
Categories
Funding
- National Nature Science Foundation of China [U1766220]
- Open Fund of National Engineering Laboratory for Ultra-high Voltage Engineering Technology (Kunming, Guangzhou)
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Icing on transmission lines might lead to ice flashovers of insulators, collapse of towers, tripping faults of transmission lines, and other accidents. Shed spacing and shed overhang of insulators are clues for evaluating the probability of ice flashover. This paper researches image-processing methods for the natural icing of in-service glass insulators. Calculation methods of graphical shed spacing and graphical shed overhang are proposed via recognizing the convexity defects of the contours of an icing insulator string based on the GrabCut segmentation algorithm. The experiments are carried out with image data from our climatic chamber and the China Southern Power Grid Disaster (Icing) Warning System of Transmission Lines. The results show that the graphical shed overhang of insulators show evident change due to icing. This method can recognize the most serious icing conditions where the insulator sheds are completely bridged. Also, it can detect bridging positions including the left side, right side, or both sides of the insulator strings in the images.
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