Condition Assessment of Water-tree Aged XLPE Cables via Very-low Frequency Dielectric Loss and U-I Hysteresis Curve

被引：0
|
作者：
Wang C. [1 ]
Zhao X. [1 ]
Zhang J. [2 ]
Jiang Q. [3 ]
Yang L. [1 ]
Liao R. [1 ]
机构：
[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing
[2] The 24th Research Institute of China Electronics Technology Group, Nan’an District, Chongqing
[3] Maintenance Branch of State Grid Jiangxi Electric Power Company, Jiangxi Province, Nanchang
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 13期
基金：
中国国家自然科学基金;
关键词：
assessment method; U-I hysteresis curve; very-low frequency dielectric loss; water-tree ageing; XLPE cable;
D O I：
10.13334/j.0258-8013.pcsee.220020
中图分类号：
学科分类号：
摘要：
To assess the influence of water tree on the insulation performance of cross linked polyethylene (XLPE) cable, a new method combining very-low frequency (VLF) dielectric loss (tan⅋) and U-I hysteresis curve is proposed in this paper. Three groups of XLPE samples are subjected to an accelerated water tree aging for 0, 96 and 168h, respectively. Afterwards the dielectric spectra from 1 mHz to 1kHz and the U-I hysteresis at different frequencies of XLPE cables with different water-tree aging time are measured via fast VLF test equipment (iFDS). It is found that the tan δ of the water-tree aged samples at the frequency below 0.1Hz (1mHz~0.1Hz) is increased dramatically. Meanwhile, two typical dielectric loss peaks at around 0.002Hz and 0.1Hz can be found, and the U-I hysteresis curves present an obvious deformation for the severely aged samples. It is analyzed that new relaxation polarizations are resulted from the water-tree ageing process. Compared with the value of tan δ at the single frequency of 0.1Hz, dielectric loss spectra at very-low frequency range can provide more information about XLPE insulation, which is more accurate to assess the deterioration degree of XLPE cable insulation. Moreover, the rate of deflection angle (RD) and the curvilinear deformation rate (RC) are both enhanced with the increase of tanδ at 1mHz. It is found that the condition of water-tree aged XLPE cables can be effectively assessed combining VLF and U-I hysteresis curves, which provides a new route for XLPE cable performance characterization. © 2023 Chinese Society for Electrical Engineering. All rights reserved.
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页码：5261 / 5270
页数：9
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