Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals
College of Engineering and Technology, Southwest University, Chongqing 400715, China
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Materials 2018, 11(11), 2124; https://doi.org/10.3390/ma11112124
Received: 12 October 2018
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Revised: 23 October 2018
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Accepted: 24 October 2018
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Published: 29 October 2018
(This article belongs to the Special Issue Cutting-Edge Research in Nano-Optics)
An accelerated thermal aging process was used to simulate the condition of paper insulation in transformer oil-paper systems. Optical parameters of the insulation paper after various aging intervals were analyzed with terahertz time-domain spectroscopy (THz-TDS) over the range 0.1~1.8 THz. The result shows that the paper had seven absorption peaks at 0.19, 0.49, 0.82, 1.19, 1.43, 1.53, and 1.74 THz, and density functional theory of B3LYP/6-311G+ (d, p) was used to simulate the molecular dynamics of the repeating component (cellobiose) of the cellulose paper. Theoretical spectra were consistent with experiment, which had absorption peaks at 0.18, 0.82, 1.47, and 1.53 THz in the same frequency range. At the same time, the paper samples after various aging intervals had different refractive indexes, and least squares fitting revealed a linear relationship between the degree of polymerization and the refractive index of the paper. Hence, this paper demonstrates that THz-TDS could be used to analyze the aging condition of transformer insulation paper and provides the theoretical and experimental basis for detection.
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Keywords:
novel diagnostic technique; terahertz-time-domain spectroscopy; transformer insulation paper; DFT; molecular dynamics simulation
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MDPI and ACS Style
Wang, L.; Tang, C.; Zhu, S.; Zhou, S. Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals. Materials 2018, 11, 2124. https://doi.org/10.3390/ma11112124
AMA Style
Wang L, Tang C, Zhu S, Zhou S. Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals. Materials. 2018; 11(11):2124. https://doi.org/10.3390/ma11112124
Chicago/Turabian StyleWang, Liang, Chao Tang, Shiping Zhu, and Shengling Zhou. 2018. "Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals" Materials 11, no. 11: 2124. https://doi.org/10.3390/ma11112124
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