110kV交联聚乙烯电缆绝缘层老化状态研究  

Research on Aging State of Insulating Layer of 110 kV XLPE Cable

作　　者：刘刚[1] 谢月[1] 李立浧[1] 

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《广东电力》2015年第10期72-77,共6页Guangdong Electric Power

基　　金：国家高技术研究发展计划(863计划)资助项目(2015AA050201)

摘　　要：选择两条退役110 k V交联聚乙烯电缆A、B及一条备用电缆,利用局部放电、差示扫描量热法(differential scanning calorimetry,DSC)试验、耐压试验、扫描电镜(scanning electron microscope,SEM)试验分析绝缘层老化状态。结果表明,在2U0(U0为电缆额定电压)及以下电压,电缆的局部放电量变化小,电压大于2U0后,电缆的局部微小缺陷及劣化大量显现出来,局部放电量大幅增加,但局部放电量与工频耐受电压表明电缆A、B依然符合国家标准。结合DSC试验运行和备用电缆绝缘层热力学参数,最终得到电缆A比电缆B老化严重的结论;SEM试验作为补充,说明了在电缆生产过程中的本体缺陷在后期运行中会扩大,且会加速其绝缘老化。Two retired 110 kV cross-linked polyethylene （XLPE） cables A and B and one backup cable were selected, and ex- periments including partial discharge （PD）, differential scanning calorimetry （DSC）, withstand voltage test and scanning e- lectron microscope （SEM） were used to analyzing aging state of insulating layer. Results indicate that changes of PD magni- tude of cablesare small when the voltage is two times the rated voltage （2U0） and below 2U0, while the voltage is higher than 2U0, partial small defects and degradation of cables is prominent largely and PD magnitude greatly increases but PD magnitude and working frequency withstand voltage indicates that A and B are both up to national standard. Combining DSC experiment operational parameters and thermodynamics parameters about insulating layer of backup cable, the conclusion was drawn as that cable A was more serious in aging than cable B. SEM experiment was taken as supplementation to explain that defects of the cable body in process of production might enlarge in late operation and accelerate insulating aging.

关 键 词：交联聚乙烯 老化 局部放电 差示扫描量热 耐压试验 

分 类 号：TM215.1[一般工业技术—材料科学与工程]