高压XLPE电缆缓冲层故障研究现状综述

在分析缓冲层材料特性的基础上，论述国内外有关缓冲层故障的研究现状，并为未来研究提供改进建议。综述性研究表明：放电是引起缓冲层烧蚀故障的直接原因，而电缆受潮是此类故障发生的必要条件。长期受潮会加速白粉的形成，并导致缓冲层电阻率升高。当铝护套与绝缘屏蔽层间存在气隙时，缓冲层电阻率升高、白粉的形成与过电压的冲击会使气隙内局部场强超过击穿场强，最终导致放电烧蚀。全文综述结果总结缓冲层故障成因，并在此基础上提出相应的调整建议，可以为缓冲层故障防范提供参考。

Review on the Research Status of the High Voltage XLPECable Buffer Layer Failure

Based on the analysis of the characteristics of the buffer material,this paper discusses the research status of buffer layer failure at home and abroad,and provides suggestions for future research.Summary studies show that discharge is the direct cause of ablation failure of the buffer layer,and the moisture of the cable is a necessary condition for such failures.Long-term exposure to moisture will induce the increase of the resistivity of the buffer layer and accelerate the production of high-resistance white powder.When there is an air gap between the aluminum sheath and the insulating shielding layer,the increase in resistivity of the buffer layer,the production of white powder and the impact of overvoltage will cause the local field strength in the air gap to exceed the breakdown field strength,which will eventually cause the discharge ablation.The results of the full text review summarized the causes of buffer layer failures and proposed corresponding preventive measures,which can provide as references for future research on buffer layer failures.