Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals
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 resul...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2018-10-01
|
Series: | Materials |
Subjects: | |
Online Access: | https://www.mdpi.com/1996-1944/11/11/2124 |
id |
doaj-5fa803d90d724c37884659cb35c9fb49 |
---|---|
record_format |
Article |
spelling |
doaj-5fa803d90d724c37884659cb35c9fb492020-11-24T21:09:31ZengMDPI AGMaterials1996-19442018-10-011111212410.3390/ma11112124ma11112124Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging IntervalsLiang Wang0Chao Tang1Shiping Zhu2Shengling Zhou3College of Engineering and Technology, Southwest University, Chongqing 400715, ChinaCollege of Engineering and Technology, Southwest University, Chongqing 400715, ChinaCollege of Engineering and Technology, Southwest University, Chongqing 400715, ChinaCollege of Engineering and Technology, Southwest University, Chongqing 400715, ChinaAn 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.https://www.mdpi.com/1996-1944/11/11/2124novel diagnostic techniqueterahertz-time-domain spectroscopytransformer insulation paperDFTmolecular dynamics simulation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Liang Wang Chao Tang Shiping Zhu Shengling Zhou |
spellingShingle |
Liang Wang Chao Tang Shiping Zhu Shengling Zhou Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals Materials novel diagnostic technique terahertz-time-domain spectroscopy transformer insulation paper DFT molecular dynamics simulation |
author_facet |
Liang Wang Chao Tang Shiping Zhu Shengling Zhou |
author_sort |
Liang Wang |
title |
Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals |
title_short |
Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals |
title_full |
Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals |
title_fullStr |
Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals |
title_full_unstemmed |
Terahertz Time Domain Spectroscopy of Transformer Insulation Paper after Thermal Aging Intervals |
title_sort |
terahertz time domain spectroscopy of transformer insulation paper after thermal aging intervals |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2018-10-01 |
description |
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. |
topic |
novel diagnostic technique terahertz-time-domain spectroscopy transformer insulation paper DFT molecular dynamics simulation |
url |
https://www.mdpi.com/1996-1944/11/11/2124 |
work_keys_str_mv |
AT liangwang terahertztimedomainspectroscopyoftransformerinsulationpaperafterthermalagingintervals AT chaotang terahertztimedomainspectroscopyoftransformerinsulationpaperafterthermalagingintervals AT shipingzhu terahertztimedomainspectroscopyoftransformerinsulationpaperafterthermalagingintervals AT shenglingzhou terahertztimedomainspectroscopyoftransformerinsulationpaperafterthermalagingintervals |
_version_ |
1716758129028366336 |