交流电压下沿面放电对车载电缆材料劣化特性影响研究  

Degradation Characteristics of Train Cable Insulation by Partial Discharge under Frequent Overvoltages

作　　者：白龙雷 周利军[1] 刘聪[1] 穆强 权圣威 郭蕾[1] BAI Longlei;ZHOU Lijun;LIU Cong;MU Qiang;QUAN Shengwei;GUO Lei(College of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院,四川成都611756

出　　处：《铁道学报》2021年第5期62-70,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(51877183)

摘　　要：为研究高铁列车在交流电压作用下,沿面放电对乙丙橡胶(EPR)电缆绝缘运行可靠性的影响,文中采用具有强平行电场分量的沿面放电模型对EPR胶片进行了不同放电强度及时间的加速劣化处理,并利用三电极系统测量了试样劣化后电阻率等参数的变化情况。研究结果表明,试样经过放电劣化处理后,在电极附近有白色圆圈出现,随放电强度升高逐渐变为淡黄色,并在周围逐渐出现枝状爬电痕迹,而试样的放电起始电压和电阻率则随放电水平及时间增大逐渐递减。另外,放电量越大,试样耐压强度降低的趋势越明显。利用聚合物分子断裂概率模型评估了EPR电缆材料劣化程度与放电强度的关系,表明外施强电场作用下,EPR绝缘试样的可靠性、分子链断裂概率及速率均会受到不同程度的劣化作用及影响。For partial discharge of ethylene propylene rubber(EPR)research high-speed train operation effect of cable insulation reliability,this paper adopts column plate discharge model of EPR film under different discharge levels and time of degradation processing,and using the three electrode system was measured after the sample deterioration of conductivity changes.The results show that the samples after discharge deterioration after treatment in the electrode near the white circle,and the gradual emergence of dendritic creepage trace,and the initial discharge voltage and electrical resistivity with time increasing the discharge level gradually decreased.In addition,the greater the amount of discharge,the breakdown voltage decreases more obviously,and the use of polymer life assessment model was used to fit the power function formula of EPR cable material deterioration,shows that external electric field,EPR insulation probability and the service life of the sample rate and the molecular chain fracture would be accelerated and influence.

关 键 词：乙丙橡胶电缆 沿面放电 表面电阻率 劣化过程 放电强度 

分 类 号：U229[交通运输工程—道路与铁道工程]