Study on Micro Topography of Thermal Aging of Insulation Pressboard Based on Image Processing

Liang Zhao, Wenhui Jiang, Yulong Wang, Ziqi Wang () and Yongqiang Wang
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Liang Zhao: China Southern Grid Digital Grid Research Institute Co., Ltd., Guangzhou 510000, China
Wenhui Jiang: China Southern Grid Digital Grid Research Institute Co., Ltd., Guangzhou 510000, China
Yulong Wang: China Southern Grid Digital Grid Research Institute Co., Ltd., Guangzhou 510000, China
Ziqi Wang: School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071000, China
Yongqiang Wang: Department of Electrical Engineering, North China Electric Power University, Baoding 071000, China

Energies, 2022, vol. 15, issue 17, 1-12

Abstract: The insulation pressboard is very important in the insulation of oil-immersed transformers, which determines the useful life of the transformer. In order to analyze the change in the micro topography of the pressboard under the condition of thermal aging in detail, the insulation pressboard samples of different thermal aging periods were made. Image enhancement, denoising, segmentation, optimization, edge detection, expansion, and corrosion were used to process SEM images of the pressboard after thermal aging, so as to extract the fiber width, hole size, and surface roughness. By comparing the relationship between the micro topography and the degree of polymerization of the insulation pressboard in different thermal aging periods, it can be concluded that when the fiber width was 91% of the unaged pressboard fiber width, and the corresponding roughness was 0.162, the insulation life was only approximately half of its original value, and when the fiber width was 79% of that of the unaged pressboard, the corresponding roughness was 0.225, and the insulation life was nearing the end of its life. This shows that the image processing method used in this paper can observe the micro topography changes during thermal aging and can estimate the thermal aging degree of the insulation pressboard.

Keywords: image processing; insulation pressboard; thermal aging; SEM image (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: 2022
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