Improved Image Analysis Method to Evaluate Tracking Property under Successive Flashover Based on Fractal Theory

Xiaolong Li, Chen Cao and Xin Lin
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Xiaolong Li: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Chen Cao: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Xin Lin: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China

Energies, 2021, vol. 14, issue 24, 1-13

Abstract: Successive flashover would result in carbonized tracking on insulator surface and cause deterioration to the insulation. Thus, investigation of the tracking can be beneficial in understanding flashover characteristics during long-term operation. In this paper, DC flashover was operated on the insulator, and the image of tracking after successive discharge were captured. Improved differential box-counting method (IDBM) was applied to analyze these images based on fractal theory. Weighted item was suggested during the counting procedure for rectangle image with margin covered by cut-size box. Fractal dimension of the tracking was calculated according to the suggested method. It is claimed that the suggested method could estimate the discharge propagation property and deterioration characteristics on the insulator surface. Moreover, IDBM showed advantages in image pre-processing and deterioration property revealed compared to traditional box-counting method attributing to the consideration of color depth. This image analysis method shows universality in dealing with tracking image and could provide additional information to flashover voltage. This paper suggested a potential approach for the investigation of discharge mechanism and corresponding deterioration in future research.

Keywords: fractal dimension; flashover; tracking; differential box-counting method; insulator; epoxy resin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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