磁悬浮轨道交通用特殊电缆热老化性能研究  

Research on Thermal Aging Performance of Special Cables for Magnetic Levitation Rail Transit

作　　者：高磊 吴仲孝 洪宁宁 GAO Lei;WU Zhongxiao;HONG Ningning(State Key Laboratory of Special Cable Technology,Shanghai Electric Cable Research Institute Co.,Ltd.,Shanghai 200093,China)

机构地区：[1]上海电缆研究所有限公司特种电缆技术国家重点实验室,上海200093

出　　处：《材料导报》2024年第S02期494-498,共5页Materials Reports

摘　　要：本研究深入探讨了磁悬浮轨道交通中特殊电缆的热老化特性,旨在保障列车运行的安全性与稳定性。通过实施一系列热老化试验,包括在125℃至165℃温度梯度下对乙丙橡胶绝缘材料的老化行为分析,以及在90℃条件下对电缆进行长达30年等效老化的性能劣化趋势研究,揭示了电缆绝缘老化的阶段性特征。利用快速分析法和线性拟合技术,本研究进一步剖析了活化能随等效老化时间的动态变化,发现其经历了先升后降再升的复杂过程,这一现象可能归因于抗氧化剂的消耗、二次交联作用及自由基的生成等多重因素的交互作用。研究表明,电缆绝缘老化的第二阶段是性能急剧下降的关键时期,此时材料内部羰基含量的显著升高可作为老化程度的重要指标。通过监测羰基含量和活化能的变化,可以有效地评估电缆绝缘的老化状态,为磁悬浮轨道交通系统的维护和电缆寿命的预测提供科学依据。此外,对制定电缆寿命延长策略具有一定的工程应用价值。This study delved into the thermal aging characteristics of special cables used in magnetic levitation rail transit to ensure the safety and stability of train operation.A series of thermal aging tests were conducted,including the analysis of the aging behavior of ethylene-propylene rubber insulating materials under a temperature gradient from 125℃ to 165℃,and the study of the performance degradation trend of cables subjected to 30 years of equivalent aging at 90℃.The research revealed the phased characteristics of cable insulation aging.Utilizing rapid analysis methods and linear fitting techniques,this study further dissected the dynamic changes of activation energy with equivalent aging time,discovering a complex process that first increased and then decreased before increasing again.This phenomenon may be attributed to the interplay of multiple factors such as the consumption of antioxidants,secondary crosslinking effects,and the generation of free radicals.The study indicates that the second phase of cable insulation aging is a critical period for a sharp decline in performance,during which a significant increase in the internal carbonyl content of the material can serve as an important indicator of the degree of aging.Monitoring the changes in carbonyl content and activation energy can effectively assess the aging state of cable insulation,providing a scientific basis for the maintenance of magnetic levitation rail transit systems and the prediction of cable life.Furthermore,it has certain engineering applicative value for formulating strategies to extend cable life.

关 键 词：磁悬浮轨道交通 特殊电缆 热老化性能 活化能 状态监测 

分 类 号：TM249[一般工业技术—材料科学与工程]