A Non-Destructive Optical Method for the DP Measurement of Paper Insulation Based on the Free Fibers in Transformer Oil

Lei Peng, Qiang Fu, Yaohong Zhao, Yihua Qian, Tiansheng Chen and Shengping Fan
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Lei Peng: Electric science and research institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China
Qiang Fu: Electric science and research institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China
Yaohong Zhao: Electric science and research institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China
Yihua Qian: Electric science and research institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China
Tiansheng Chen: Electric science and research institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China
Shengping Fan: Electric science and research institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China

Energies, 2018, vol. 11, issue 4, 1-9

Abstract: In order to explore a non-destructive method for measuring the polymerization degree (DP) of paper insulation in transformer, a new method that based on the optical properties of free fiber particles in transformer oil was studied. The chromatic dispersion images of fibers with different aging degree were obtained by polarizing microscope, and the eigenvalues ( r , b , and Mahalanobis distance) of the images were extracted by the RGB (red, blue, and green) tricolor analysis method. Then, the correlation between the three eigenvalues and DP of paper insulation were simulated respectively. The results showed that the color of images changed from blue-purple to orange-yellow gradually with the increase of aging degree. For the three eigenvalues, the relationship between Mahalanobis distance and DP had the best goodness of fit (R 2 = 0.98), higher than that of r (0.94) and b (0.94). The mean square error of the relationship between Mahalanobis distance and DP (52.17) was also significantly lower than that of r and b (97.58, 98.05). Therefore, the DP of unknown paper insulation could be calculated by the simulated relationship of Mahalanobis distance and DP.

Keywords: degree of polymerization; free FIBER; paper insulation; chromatic dispersion image; RGB tri-color analysis (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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