1.广东电网有限责任公司东莞供电局,广东 东莞 523000
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),广州 510641
杨坤(1997),男,工程硕士,助理工程师,主要从事高压电缆试验方面的研究工作。
收稿:2025-11-29,
修回:2026-02-01,
纸质出版:2026-09-25
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杨坤,王志毅,何浩辉等.高压电缆缓冲层受潮机理与白斑生长机制研究[J].浙江电力,2026,45(09):112-122.
YANG Kun,WANG Zhiyi,HE Haohui,et al.Study on mechanisms of moisture ingress and white spot growth in high-voltage cable buffer layers[J].ZHEJIANG ELECTRIC POWER,2026,45(09):112-122.
杨坤,王志毅,何浩辉等.高压电缆缓冲层受潮机理与白斑生长机制研究[J].浙江电力,2026,45(09):112-122. DOI: 10.19585/j.zjdl.202609011.
YANG Kun,WANG Zhiyi,HE Haohui,et al.Study on mechanisms of moisture ingress and white spot growth in high-voltage cable buffer layers[J].ZHEJIANG ELECTRIC POWER,2026,45(09):112-122. DOI: 10.19585/j.zjdl.202609011.
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Al³⁺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 Al³⁺ 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.
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