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退役高压交联聚乙烯电缆绝缘老化状态分析

, PP. 41-46

Keywords: 交联聚乙烯,聚集态结构,差式扫描量热法,力学性能

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Abstract:

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。

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