Relationship Between Thermal Aging and Insulation Properties of XLPE

doi:10.11930/j.issn.1004-9649.202003216

Abstract

Abstract: In order to study the crossed-linked polyethylene (XLPE) insulation material in thermal decomposition activation energy, electrical and mechanical properties changing with thermal aging degree, accelerated thermal aging tests were carried out at 110 ℃ on XLPE insulation material for AC cables. The thermal decomposition behavior of XLPE at 20~600 ℃ was studied by thermogravimtric analyzer (TGA) test. The electrical properties of the aged XLPE samples were studied by AC breakdown testing, broadband dielectric spectrum testing and volume resistivity testing; and the mechanical properties of the aged XLPE samples were studied by tensile test. The results show that the crosslinking structure and crystalline state of XLPE are destroyed by thermal aging, and the activation energy of XLPE tends to decrease. Due to the rapid oxidation reaction, the XLPE molecular chain breaks and the cross-linking structure weakens, resulting in serious deterioration of XLPE insulation materials. The activation energy, breakdown strength, volume resistivity, elastic modulus and elongation at break tend to decrease with the increase of aging time, while the dielectric constant, dielectric loss and conductivity tend to increase.

Key words: XLPE, thermal aging, activation energy, electrical properties, mechanical properties

ZHAO Lihua, YANG Lan, LI Weiwei, WU Weiqing, REN Junwen. Relationship Between Thermal Aging and Insulation Properties of XLPE[J]. Electric Power, 2020, 53(9): 118-124.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202003216

https://www.electricpower.com.cn/EN/Y2020/V53/I9/118

References

[1] 朱爱荣, 曹晓珑. 交联聚乙烯绝缘材料热稳定性分析[J]. 电线电缆, 2006(1): 34–36
ZHU Airong, CAO Xiaolong. Analysis of the thermal stability of XLPE insulation[J]. Wire & Cable, 2006(1): 34–36
[2] LI H, LI J Y, LI W W, et al. Fractal analysis of side channels for breakdown structures in XLPE cable insulation[J]. Journal of Materials Science: Materials in Electronics, 2013, 24(5): 1640–1643.
[3] LI W W, LI J Y, YIN G L, et al. Frequency dependence of breakdown performance of XLPE with different artificial defects[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2012, 19(4): 1351–1359.
[4] LI H, LI J, WANG Q, et al. Investigation of dielectric and mechanical properties of undegassed XLPE cable with thermal treatment[J]. High Voltage Engineering, 2015, 41(4): 1237–1242.
[5] 霍瑞美. 交联聚乙烯热老化监测及快速热寿命评估[D]. 上海: 上海交通大学, 2014.
HUO Ruimei. Research on thermal aging monitoring and fast prediction on the life of XLPE[D]. Shanghai: Shanghai Jiao Tong University, 2014.
[6] 王丽梅. 110 kV电压等级交联聚乙烯绝缘材料老化特性研究[D]. 哈尔滨: 哈尔滨理工大学, 2013.
WANG Limei. Study on aging characteristics of 110 kV insulating cross-linked polyethylene materials[D]. Harbin: Harbin University of Science and Technology, 2013.
[7] 张佳庆, 张博思, 王刘芳, 等. 电线电缆带电燃烧研究进展[J]. 材料导报, 2017, 31(15): 1–9, 35
ZHANG Jiaqing, ZHANG Bosi, WANG Liufang, et al. The state of the art of combustion behavior of live wires and cables[J]. Materials Reports, 2017, 31(15): 1–9, 35
[8] XIE A S, ZHENG X Q, LI S T, et al. Investigations of electrical trees in the inner layer of XLPE cable insulation using computer-aided image recording monitoring[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2010, 17(3): 685–693.
[9] CHISHOLM N, MAHFUZ H, RANGARI V K, et al. Fabrication and mechanical characterization of carbon/SiC-epoxy nanocomposites[J]. Composite Structures, 2005, 67(1): 115–124.
[10] GWAILY S E, BADAWY M M, HASSAN H H, et al. Natural rubber composites as thermal neutron radiation shields: I. B4C/NR composites[J]. Polymer Testing, 2002, 21(2): 129–133.
[11] NISHII K, KIMURA K, ISHIZUKA M, et al. Polyamide resin composition and housing for electronic equipment: US5470909[P]. 1995-11-28.
[12] 欧阳本红, 赵健康, 陈铮铮, 等. 老化方式对交流交联聚乙烯电缆空间电荷分布的影响[J]. 高电压技术, 2012, 38(8): 2123–2128
OUYANG Benhong, ZHAO Jiankang, CHEN Zhengzheng, et al. Influence of aging mode on space charge distribution of AC XLPE cables[J]. High Voltage Engineering, 2012, 38(8): 2123–2128
[13] 胡丽斌, 陈杰, 李陈莹, 等. XLPE电缆绝缘加速热老化特性[J]. 绝缘材料, 2020, 53(2): 59–63
HU Libin, CHEN Jie, LI Chenying, et al. Accelerated thermal ageing characteristics of XLPE cable insulation.[J]. Insulating Materials, 2020, 53(2): 59–63
[14] 刘继平, 王浩鸣, 唐庆华, 等. 热老化对直流XLPE绝缘性能的影响研究[J/OL]. 电力系统及其自动化学报: 1-7[2020-07-13]. https://doi.org/10.19635/j.cnki.csu-epsa.000339.
LIU Jiping, WANG Haoming, TANG Qinghua, et al. Study on the effect of thermal aging on the insulation performance of DC XLPE[J/OL]. Proceedings of the CSU-EPSA: 1-7[2020-07-13]. https://doi.org/10.19635/j.cnki.csu-epsa.000339.
[15] 李欢, 李建英, 马永翔, 等. 不同温度热老化条件下交联聚乙烯电缆绝缘热性能和力学性能的劣化趋势研究[J]. 绝缘材料, 2018, 51(1): 57–63
LI Huan, LI Jianying, MA Yongxiang, et al. Degradation trend of thermal and mechanical properties of XLPE cable insulation thermal ageing at different temperatures[J]. Insulating Materials, 2018, 51(1): 57–63
[16] 康茹雪. 环境压力对非碳化黑色ABS热解、着火性能及CO释放影响研究[D]. 合肥: 中国科学技术大学, 2017.
KANG Ruxue. Study on the influence of environment pressure on pyrolysis, ignition performance and CO release of non-charring black ABS[D]. Hefei: University of Science and Technology of China, 2017.
[17] 朱江. 基于多场耦合的电力电缆温度场仿真及其监测系统研究[D]. 北京: 华北电力大学(北京), 2017.
ZHU Jiang. Research on monitoring system and temperature field simulation of power cable based on multi field coupling[D]. Beijing: North China Electric Power University, 2017.
[18] 兰莉. 温度对聚合物绝缘中空间电荷行为的影响[D]. 上海: 上海交通大学, 2015.
LAN Li. Effect of temperature on space charge distribution in polymer insulation[D]. Shanghai: Shanghai Jiao Tong University, 2015.
[19] 刘飞. 35 kV及以下XLPE电力电缆绝缘老化评估研究[D]. 上海: 上海交通大学, 2014.
LIU Fei. Evaluation of the insulation aging of 35 kV and below XLPE power cables[D]. Shanghai: Shanghai Jiao Tong University, 2014.