基于tan δ积分值的乙丙橡胶绝缘电缆含水量评估  

Evaluation of moisture content for ethylene-propylene rubber (EPR) insulation cables using integral values of tan δ

作　　者：周长亮[1] 王志强[1] 李国锋[1] 

机构地区：[1]大连理工大学电子信息与电气工程学部,辽宁大连116024

出　　处：《大连理工大学学报》2013年第2期261-266,共6页Journal of Dalian University of Technology

基　　金：中央高校基本科研业务费专项资金资助项目(DLUT11RC(3)08)

摘　　要：应用介质损耗角正切值(tan δ)的积分值来评估乙丙橡胶绝缘电缆在老化过程中的含水量和多因素老化寿命方程.参照国际标准实验方法制备绝缘材料试样,设计了浸水老化和浸水加速热老化实验.利用称重法测量试样的含水量,同时测量试样的介质损耗角正切值曲线.结果表明:在1×10-2～1Hz的介电频谱积分值能有效地表征含水量的变化趋势.对比浸水加速热老化的测量曲线,推导出了积分值的绝缘材料的寿命老化模型及多因素之间的影响函数.发现在1×10-2～1Hz tan δ曲线积分与含水量之间存在单调性关系,因此可以利用tan δ曲线积分值测定含水量.The integral values of dielectric dissipation factor tangent value （tan δ） are applied to nondestructively estimating moisture content and deducing multi-factors lifetime aging model in low- voltage ethylene-propylene rubber （EPR） insulation cables. Referring to the international standards, EPR insulation materials are made and the testing of immersion and thermal and water-immersed aging is done. The moisture content is measured by weighting method. At the same time, the dielectric dissipation factors tangent values of the whole cables are also measured. The results indicate that the moisture content of EPR insulation materials can be characterized by the curve of integral values of dielectric dissipation loss from 1×10^-2 Hz to 1 Hz. Contrasting the results of thermal and water- immersed aging, the multi-factors lifetime aging model is obtained and the function between multi- factors is calculated. It＇s revealed that there is a monotonous relationship between the integration of the curve and the moisture content during the frequency of 1×10^-2 Hz to 1 Hz. Therefore, the moisture content can be measured using the integral values of tan δ curves.

关 键 词：含水量 乙丙橡胶 热老化 介质损耗角正切值 

分 类 号：TM227.1[一般工业技术—材料科学与工程]