Aging characteristics of polyester material of gas-solid composite insulated transformer

被引：0
|
作者：
Li Q.-H. [1 ]
Zhang D.-N. [1 ]
Wang Q. [2 ]
Ren Z.-G. [2 ]
Wu M. [1 ]
Zhang G.-J. [1 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an
[2] State Grid Beijing Electric Power Research Institute, Beijing
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2023年 / 27卷 / 01期
关键词：
aging characteristics; frequency domain dielectric spectrum; gas insulated transformer; H-N dielectric relaxation model; near infrared spectrum; physical and chemical properties; polyester material;
D O I：
10.15938/j.emc.2023.01.003
中图分类号：
学科分类号：
摘要：
In order to study the aging state of SF6 gas-solid composite insulated transformer under long-term operation, an aging evaluation model of polyester insulation material inside the transformer was established. Firstly, the accelerated thermal aging experiment of 6020 PET films was carried out, and then the aging characteristics of PET materials were detected by frequency domain dielectric spectroscopy, differential scanning calorimetry, tensile and near infrared spectroscopy. The experimental results show that the dielectric loss of PET films decreases first and then increases with aging. The typical characteristic parameters τ1 and τ2 were selected by using the Havriliak-Negami dielectric relaxation model, and the empirical formulas of aging time and τ1 and τ2 are obtained. The crystallinity and elongation at break of PET films firstly increase and then decrease with aging, while the tensile strength decreases. The near infrared absorbance of PET films decreases with aging, and the linear discriminant analysis algorithm was used to reduce the dimension of PET films, and good classification results were obtained. The results show that the dielectric relaxation time constants τ1 and τ2, the tensile strength and the absorbance characteristic parameters of near infrared spectrum can better characterize the aging degree of polyester materials. © 2023 Editorial Department of Electric Machines and Control. All rights reserved.
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页码：23 / 32
页数：9
相关论文
共 20 条
  • [1] Gas insulated transformer market by type (instrument transformer, others),voltage(medium voltage, high voltage, extra high voltage), installation(outdoor, indoor), end-user(utility, industrial, commercial), and region-global forecast to 2023 [R], (2018)
  • [2] FARHOODI M, MOUSAVI S M, SOTUDEH-GHAREBAGH R, Et al., A study on physical aging of semicrystalline polyethylene terephthalate below the glass transition point, Journal of Applied Research and Technology, 10, 5, (2012)
  • [3] MA Chenxi, QIAO Shengya, ZHOU Wenjun, Et al., Decomposed gases generated by partial discharges at floating potential defects in SF<sub>6</sub> gas transformers [J], High Voltage Engineering, 46, 11, (2020)
  • [4] ZHU Fangfei, LI Fan, MENG Yuchan, Discussing on SF<sub>6</sub> gas insulating transformer and its supervising [J], Electric Power Standardization & Construction Cost Control Information, 2, (2002)
  • [5] CHANG TAO, LIU Yong, FANG Yulin, Et al., Diagnosis analysis of SF<sub>6</sub>-insulated transformer fault [J], Transformer, 46, 5, (2009)
  • [6] ZHAO Yikun, ZHANG Guoqiang, HAN Dong, Et al., Study on surface discharge characteristics of inter-turn insulation materials in high-frequency transformers [J], Transactions of China Electrotechnical Society, 34, 16, (2019)
  • [7] LI Qianqian, WU Changliang, Study on wet and heat aging properties of PET films for photovoltaic backpanels, Solar Energy, 8, (2014)
  • [8] XIN Zhe, ZHAO Tong, HAN Zhiyun, Et al., Molecular dynamics simulation of the pyrolysis mechanism of polyester films in gas insulation lines under electrothermal stresses [J], Transactions of China Electrotechnical Society, 33, 22, (2018)
  • [9] MOREL J, DUNG P, JOLY J., Thermal aging of bi-axially orifnted pet films: relation between structural changes and dielectric behavior [J], IEEE Transactions on Electrical Insulation, 15, 4, (1980)
  • [10] BUXBAUM L H., The degradation of poly(ethylene terephthalate) [J], Angewandte Chemie International Edition, 7, 3, (2010)
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