严寒运行工况下高速铁路供电电缆附件界面绝缘匹配劣化特性  

Degradation Characteristics of Insulation Matching at Cable Accessories Interface in High-speed Railway Power Supply Under Cold Operating Conditions

作　　者：朱光亚 沈青 李军 邵岩[3] 周凯[1] 侯永昌 ZHU Guangya;SHEN Qing;LI Jun;SHAO Yan;ZHOU Kai;HOU Yongchang(College of Electrical Engineering,Sichuan University,Chendu 610065,China;China Railway Chengdu Group Co.,Ltd.,Chendu 610082,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chendu 610031,China)

机构地区：[1]四川大学电气工程学院,成都610065 [2]中国铁路成都局集团有限公司,成都610082 [3]中铁二院工程集团有限责任公司,成都610031

出　　处：《高电压技术》2025年第3期1361-1370,共10页High Voltage Engineering

基　　金：国家自然科学基金(52107160)。

摘　　要：针对严寒地区高速铁路供电电缆在极端电-热应力协同作用下界面绝缘匹配劣化特性不清的问题,在实验室内搭建电缆系统短时过热试验平台,模拟供电电缆运行工况,对比分析了电缆终端在低温短时过热工况下的界面压力变化情况,同时结合仿真和数学建模手段分析界面微观形态变化情况,推演获得该工况下附件绝缘匹配劣化演变规律。研究结果表明:电缆附件界面绝缘在短时过热单周期内,材料分子-气体分子协同作用使得界面空腔区域形态结构发生变化,界面压力先增后降。随着短时过热次数的增加,残余应力逐渐积累,界面粗糙度先减后增,从而导致不同阶段各个状态的界面压力变化各不相同。基于结果推演得到的劣化演变规律,对于预防电缆突发故障发生奠定了重要理论基础。To address the unclear characteristics of interface insulation degradation in high-speed railway power cables under extreme electro-thermal stress in cold regions,we established a short-term overheating test platform for cable sys-tems in a laboratory setting.We simulated the operating conditions of power cables and analyzed the interface pressure variations of cable terminals under low-temperature,short-term overheating conditions.Additionally,we used simulation and mathematical modeling techniques to examine the microstructural changes at the interface and deduced the degrada-tion evolution pattern of insulation matching under these conditions.The results show that,within a single short-term overheating cycle,the synergistic effect of material molecules and gas molecules causes structural changes in the interface cavity,resulting in an initial increase followed by a decrease in interface pressure.As the number of short-term overheat-ing cycles increases,the residual stress gradually accumulates,and interface roughness initially decreases and then increases,leading to different interface pressure variations at various stages.The degradation evolution pattern derived from these results provides a crucial theoretical basis for preventing sudden cable failures.

关 键 词：电缆终端 低温 短时过热 界面压力 有限元分析 

分 类 号：U223.8[交通运输工程—道路与铁道工程]