摘要
在实际运行过程中,交联聚乙烯电缆(XLPE)在高温的长期作用下,会发生不可逆的破坏,使用寿命缩短。研究从材料学的角度,利用核磁共振分析仪研究XLPE的热老化行为,发现了能表征XLPE热老化规律的特征量—纵向弛豫时间和波峰面积。实验结果表明,波峰面积随老化温度和老化时间增大而减小,且波峰面积与老化时间呈近似线性规律;纵向弛豫时间也随热老化程度增大而下降。此方法为准确监测电缆老化情况提供了重要的应用价值。
XLPE cable in practical application is subjected mostly to thermal stress,which would cause an irreversible damaging and shorten its lifetime.A method based on nuclear magnetic resonance（NMR）is proposed.This paper presents the characteristic quantities of thermal aging process-vertical relaxation time and area of wave crest.Experimental results indicate that the vertical relaxation time and area of wave crest decreases with the increase of aging time and aging temperature,and the relationship between the area of wave crest and aging time is approximately linear.The proposed method provides great application value for monitoring cable aging process.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第8期41-45,共5页
Journal of Chongqing University
基金
国家自然科学基金资助项目(51477013)
关键词
交联聚乙烯电缆
热老化
核磁共振
纵向弛豫时间
XLPE cable
thermal aging
nuclear magnetic resonance（NMR）
vertical relaxation time
