高压交联聚乙烯电缆缓冲层烧蚀机理  

Erosion Mechanisms of High Voltage Cross-Linked Polyethylene Cable Buffer Layers

作　　者：孟晓凯 俞华 芦竹茂 晋涛 Xiaokai Meng;Hua Yu;Zhumao Lu;Tao Jin(State Grid Shanxi Electric Power Research Institute,Taiyuan 030001,China)

机构地区：[1]国网山西省电力公司电力科学研究院,山西太原030001

出　　处：《高分子材料科学与工程》2025年第1期136-144,共9页Polymer Materials Science & Engineering

基　　金：国网山西省电力公司研究开发项目(520530230002)。

摘　　要：高压交联聚乙烯(XLPE)电缆的缓冲层烧蚀问题日益突出,对电网的稳定运行构成了严重威胁。文中通过统计分析近年来缓冲层烧蚀故障的案例,搭建了模拟实验平台,研究了压力和湿度对缓冲层烧蚀的影响。结果表明,在潮湿环境中,随着压力的增大,缓冲层烧蚀电压从36 V逐渐减小至24 V,烧蚀电流从1340 mA逐渐减小至879 mA;在干燥环境中,随着压力的增大,缓冲层烧蚀电压从24 V逐渐减小至15 V,烧蚀电流从155 mA逐渐增大至952 mA。通过扫描电镜和能谱分析仪表征了烧蚀产物的形貌和组分,发现烧蚀后缓冲层和绝缘层之间的白色粉末主要由缓冲层中的阻水粉析出形成。有限元分析进一步揭示了典型的110 kV XLPE高压电缆缓冲层的烧蚀机理,发现电缆自身重量在重力作用下导致护套和缓冲层之间发生过盈配合及外界环境湿度变化是导致烧蚀的重要原因。研究成果为高压XLPE电缆的缓冲层烧蚀防护提供了实验基础与理论依据。Erosion in the buffer layer of high-voltage crosslinked polyethylene(XLPE)cable has become a significant concern,severely threatening the stability of power grids.This work statistically reviewed recent cases of buffer layer erosion and constructed a simulation platform to examine the impact of pressure and humidity on erosion.The results show that in humid conditions,as the pressure rises,the erosion voltage of buffer layer drops from 36 V to 24 V,and the current changes from 1340 mA to 879 mA.Conversely,in dry conditions,the voltage decreases from 24 V to 15 V,while the current increases from 155 mA to 952 mA with rising pressure.SEM and energy dispersive spectrometry(EDS)of the eroded products identify the formation of white powder,primarily due to the precipitation of water-blocking agents from the buffer layer.Finite element analysis elucidates the erosion mechanism,highlighting the role of the mass of cable under gravity and ambient humidity fluctuations in causing erosion.The outcomes of this study could offer theoretical foundation and experimental evidence for developing erosion protection strategies of XLPE cable buffer layers.

关 键 词：缓冲层 高压电缆 铝护套 绝缘层 

分 类 号：TM247.1[一般工业技术—材料科学与工程]