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574 / 2022-03-30 12:20:22
Evolution of Dielectric properties of cross-linked polyethylene under thermal-oxidative aging
dielectric property,cross-linked polyethylene,thermal-oxidative aging,dipolar polarization
13. Aging, Space Charge, and Industrial Applications
终稿
Jingran Wang / Xi’an Jiaotong University
Minzun Ji / Xi’an Jiaotong University
Hongwei Zhuang / Guangxi Fangchenggang Nuclear Power Co, Ltd
Wei Wei / Suzhou Nuclear Power Research Institute
Xiaohong Chi / Xi’an Jiaotong University
Lu Cheng / Xi'An Jiaotong University
Wenfeng Liu / Xi'an Jiaotong University
Cross-linked polyethylene (XLPE) is widely used as the insulation material of nuclear electrical cables due to its excellent mechanical and electrical properties. The condition monitoring technique is essential for the safe and stable operation of the nuclear power plant. As the key characteristics, dielectric properties are important for assessing the insulation state of cables. This study focus on the dielectric properties evolution of cross-linked polyethylene under thermal-oxidative aging. In this work, XLPE specimens were thermally aged in an air-circulating oven at 165 °C and removed at 0 h, 48 h, 96 h, 168 h, and 336 h for analysis. The dielectric properties were investigated through the Frequency Domain Spectroscopy (FDS) at 100 °C in a frequency range from 10-1 to 106 Hz and the structural changes were analyzed with the Fourier transform infrared (FTIR) spectroscopy. The complex permittivity spectra of XLPE with different aging time were fitted by Havriliak-Negami(HN) equations, the relaxation parameters as well as the DC conductivity were obtained to investigate the influence of thermal-oxidative aging on dielectric properties of XLPE. The results show that the fitting computation results are consistent with the experimental ones based on the HN equations. The real and imaginary permittivity augment on mid-frequency with the increase of aging time due to the dipolar polarization α. Also, the relaxation time constant τα and the dipolar polarization intensity ∆α augment with the aging duration. Besides, the DC conductivity increases sharply within the first 48 hours, giving a rise to the imaginary permittivity on low frequency. This study has shown that thermal-oxidative aging can significantly affect the dielectric response, especially at the early stages of aging. It is found that there is a good correlation between these three parameters and the insulation state of XLPE cables.

 
重要日期

  • 会议日期

    09月25日

    2022

    至

    09月29日

    2022

  • 08月15日 2022

    提前注册日期

  • 09月10日 2022

    报告提交截止日期

  • 11月10日 2022

    注册截止日期

  • 11月30日 2022

    初稿截稿日期

  • 11月30日 2022

    终稿截稿日期

主办单位
IEEE DEIS
承办单位
Chongqing University
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