杨坤,王志毅,何浩辉,叶钜芬,周文青,肖启昊,刘刚
YANG Kun,WANG Zhiyi,HE Haohui,YE Jufen,ZHOU Wenqing,XIAO Qihao,LIU Gang

• 1:广东电网有限责任公司东莞供电局
• 2:华南理工大学电力学院(广东省绿色能源技术重点实验室)

摘要(Abstract)：

针对高压XLPE（交联聚乙烯）电缆缓冲层受潮及白斑生长机制开展系统研究，旨在明确水分来源与白斑演化过程。系统阐述了缓冲层受潮的水分来源，并对腐蚀过程进行了热力学分析，将能斯特-普朗克模型与电化学实验联合应用于白斑动力学分析。结果表明：缓冲层水分来源于DCP（过氧化二异丙苯）交联副产物释放与生产、运输、敷设环节的环境吸湿；估算110 kV电缆残留枯基醇可释放水量约为11.4 g/km；在30℃/80%RH条件下，阻水缓冲带与非阻水缓冲带含水率分别约为11.42%和7.14%。交流电场导致铝护套发生阴阳极交替腐蚀，生成的Al~(3+)在缓冲层中水解并与聚丙烯酸钠螯合，形成白斑；热力学分析显示金属铝腐蚀焓变约为-829.2 kJ/mol，氧化铝腐蚀焓变约为-2.4 kJ/mol，放热可致局部升温并引起聚酯纤维热损伤，从而加速腐蚀发展。上述发现可为缓冲层缺陷治理与材料工艺改进提供理论依据。
A systematic study is conducted on mechanisms of moisture ingress and white spot growth in high-voltage XLPE(cross-linked polyethylene) cable buffer layers, aiming to clarify the sources of moisture and the evolution process of white spots. The moisture sources of the buffer layers are comprehensively analyzed, and a thermodynamic analysis of the corrosion process is performed. The Nernst-Planck model is combined with electrochemical experiments to investigate the kinetics of white spot formation. The results indicate that moisture in the buffer layers originates from the release of by-products of DCP cross-linking and environmental moisture absorption during manufacturing, transportation, and installation. The residual cumyl alcohol in a 110 kV cable is estimated to release approximately 11.4 g/km of water. At a temperature of 30 °C and a relative humidity of 80%, the moisture contents of water-blocking tape and non-water-blocking tape are approximately 11.42% and 7.14%, respectively. The AC electric field induces alternating anodic and cathodic corrosion of the aluminum sheath. The generated Al~(3+) undergoes hydrolysis in the buffer layers and chelates with sodium polyacrylate, forming white spots. Thermodynamic analysis shows that the enthalpy change of aluminum corrosion is approximately -829.2 kJ/mol, while that of aluminum oxide corrosion is approximately-2.4 kJ/mol. The exothermic effect can cause local temperature rise and induce thermal damage to polyester fibers, thereby accelerating corrosion. These findings provide a theoretical basis for defect mitigation in buffer layers and improvement of material processes.

关键词(KeyWords)： 缓冲层受潮;白斑;交流电化学腐蚀;离子输运
moisture ingress of buffer layer;white spot;alternating current electrochemical corrosion;ion transport

Abstract:

Keywords:

基金项目(Foundation): 中国博士后科学基金（2024M760942）;; 中国南方电网有限责任公司资助项目（031900KC23110060(GDKJXM20231243)）

作者(Author): 杨坤,王志毅,何浩辉,叶钜芬,周文青,肖启昊,刘刚
YANG Kun,WANG Zhiyi,HE Haohui,YE Jufen,ZHOU Wenqing,XIAO Qihao,LIU Gang

DOI: 10.19585/j.zjdl.202609011

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