摘要
通过对北京多根退役110kV及220kV交联聚乙烯电缆绝缘层进行差式扫描量热和力学性能分析,研究了电缆绝缘材料聚集态结构及宏观力学性能变化。DSC研究表明:运行10年以上电缆其熔融峰左极限温度向低温方向移动10℃左右,即材料结晶度、晶体大小及晶体尺寸分布发生改变;运行后试样结晶速率呈增加趋势,说明材料某些交联点发生了氧化断链,交联度降低。力学性能分析得到:运行10年以上电缆试样其弹性模量、断裂能降低,结合DSC分析可得这些试样发生了一定程度的物理老化。
The aim of this paper is to research the aggregation state and mechanical properties of insulation material from 110kV and 220kV XLPE cables out of service in Beijing. The slices cut from the cable were researched through the differential scanning calorimeter analysis （DSC） and mechanical property analysis. The DSC analysis results show that the left limit temperature of melting peak for cables operated for more than 10 years are extended about 10~C to the lower temperature direction, which means that the crystallinity, crystal size and crystal size distribution are changed; the crystallization rate of sample operated increased with operation year, which means that some bonds of the crosslink points are broken. The results of mechanical property analysis show that the elastic modulus, fracture energy of cables operated for more than 10 years are decreased, which means there exist partly physical ageing of these samples in consideration of the DSC analysis.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第10期41-46,共6页
Transactions of China Electrotechnical Society
关键词
交联聚乙烯
聚集态结构
差式扫描量热法
力学性能
Cross-linked polyethylene （XLPE）, aggregation state, differential scanning calorimeter analysis（DSC）, mechanical properties
