高压XLPE电缆阻水缓冲层烧蚀机理研究现状

Research Status of Ablation Mechanism of Water-blocking Buffer Layer in High Voltage XLPE Power Cable

近年来高压电缆阻水缓冲层事故频发,已严重威胁到输电系统的安全性。本文对目前国内外缓冲层失效的相关研究现状进行综述,并提出可能的预防措施。首先,统计了近年来文献报道的电缆缓冲层烧蚀导致的失效事故,梳理了失效缓冲层存在的共同特征。然后,在介绍阻水缓冲层基本结构及作用的基础上,结合文献扫描电子显微镜(SEM)、能谱仪(EDS)及X射线衍射(XRD)实验结果对缓冲层中白斑现象进行解释,提出使用中性阻水粉可有效地抑制白斑的产生。根据缓冲层烧蚀的相关研究,将缓冲层烧蚀机理分为局部放电致烧蚀以及电流热效应致烧蚀,并讨论了研究中仿真建模存在的问题。最后,对现有缓冲层相关研究进行总结与展望,提出减小铝护套与缓冲层之间的空隙以及防止缓冲层受潮可有效减缓缓冲层的烧蚀,但如何实现需进一步研究。

In recent years,failures of water-blocking buffer layer in high voltage cables occur frequently,which has become a seriously threat to the security of the power transmission system.This paper summarized the latest research status of buffer layer failure,and put forward the possible preventive measures.Firstly,the accidents caused by the failure of water-blocking layer reported in recent years were enumerated,and the common characteristics of the failure were carefully analyzed.Then,on the basis of the introduction of structure and function of the water blocking buffer layer,combining with the literature and the experimental results of scanning electron microscope(SEM),energy disperse spectrometer(EDS),and X-ray diffraction(XRD),the phenomenon of white spot in buffer layer was explained,and it was proposed that the neutral water-blocking powder could effectively inhibit the generation of white spot.According to the research of buffer layer ablation,the ablation mechanism of buffer layer was divided into partial discharge ablation and current thermal effect ablation,and the problems of simulation modeling in the research were discussed.Finally,the existing researches on the ablation of the buffer layer was summarized and prospected,and it is suggested that reducing the gap between aluminum sheath and preventing the buffer layer from getting damp can effectively slow down the buffer layer ablation,but it needs further research to achieve.