Structural Changes and Very-Low-Frequency Nonlinear Dielectric Response of XLPE Cable Insulation under Thermal Aging

被引：3
|
作者：
Wang, Can [1 ]
Zhao, Xuetong [1 ]
Qiao, Jingqi [1 ]
Xiao, Yongjian [1 ]
Zhang, Jie [2 ]
Li, Yuchen [1 ]
Cao, Hanzhong [1 ]
Yang, Lijun [1 ]
Liao, Ruijin [1 ]
机构：
[1] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Sec, Chongqing 400044, Peoples R China
[2] China Elect Chip Technol Res Inst, Chongqing 400044, Peoples R China
来源：
MATERIALS | 2023年 / 16卷 / 12期
基金：
中国国家自然科学基金;
关键词：
XLPE cable insulation; thermal aging; very-low-frequency dielectric property; physicochemical property; U-I hysteresis curve; OIL-PAPER INSULATION; SYSTEM; VLF;
D O I：
10.3390/ma16124388
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The structural changes and very-low-frequency (VLF) nonlinear dielectric responses are measured to evaluate the aging state of cross-linked polyethylene (XLPE) in power cables under various thermal aging conditions. For this purpose, the accelerated thermal aging experiments were performed on XLPE insulation materials at 90 & DEG;C, 120 & DEG;C and 150 & DEG;C with different durations of 240 h, 480 h and 720 h, respectively. The Fourier transform infrared spectrum (FTIR) characterization and differential scanning calorimeter (DSC) were tested to analyze the influence of different aging on physicochemical properties of XLPE insulation. Besides, the VLF dielectric spectra show that the permittivity and dielectric loss change significantly in the VLF range from 1 mHz to 0.2 Hz. A voltage-current (U-I) hysteresis curve referring to a standard sinusoidal voltage and the response current were introduced to characterize the nonlinear dielectric properties of XLPE insulation caused by thermal aging.
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页数：11
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