摘要
随着高速铁路快速发展,乙丙橡胶(ethylene propylene rubber,EPR)电缆终端在高铁列车中的应用越来越广泛,高寒环境下乙丙橡胶电缆终端因气隙缺陷导致的局部放电甚至击穿故障频发。为研究高寒地区电缆终端气隙缺陷的放电特征,以含气隙缺陷的EPR电缆终端为试验样品,搭建了模拟高寒地区环境条件的低温局部放电测试系统,对比研究了-40℃和20℃下电缆终端局部放电发展特性和绝缘击穿过程。研究结果表明:与20℃下相比,-40℃下的起始电压和熄灭电压分别降低31%和28%,正负半周均有明显放电脉冲出现;20℃条件下,放电则以气隙内部放电为主,而-40℃下除气隙内部放电外,绝缘表面有明显沿面放电痕迹;-40℃下局部放电的发展过程与放电相位分布、谱图不对称度等参量密切相关,对其进行研究可进一步揭示终端局部放电发展和演变规律,并为判断终端气隙缺陷严重程度提供依据。
With the rapid development of high-speed railways,ethylene propylene rubber(EPR)cable terminals have been used in high-speed trains more widely.In alpine regions,there were many partial discharges(PDs)and even breakdown failures of EPR cable terminals occurred due to the air gap defects.To study the characteristics of partial discharge of air gap defects in cable terminals in those regions,the EPR cable terminals with air gap defects were used as test samples,and a low-temperature partial discharge test system for simulating the conditions in the alpine region was set up.The development characteristics of the partial discharge and the breakdown process of the insulation at-40℃and 20℃were comparatively analyzed.When compared the results under–40℃with the results under 20℃,the PD initiation voltage and extinction voltage at-40℃decreased by 31%and 28%,respectively,and the discharge pulse appeared at both positive and negative half cycles.The discharge is mainly the internal discharge of the air gap at 20℃.However,when the temperature decreases to-40℃,there is a marked trace of surface discharge on the insulating surface except for the internal discharge of the air gap.The characteristics of partial discharge development at-40℃are closely related to the discharge phase distribution and the asymmetry of spectrum.The research can further reveal the development and evolution of partial discharge of the terminal,and provide a basis for judging the severity of the terminal air gap defect.
作者
白龙雷
周利军
曹伟东
车雨轩
邢立勐
李丽妮
BAI Longlei;ZHOU Lijun;CAO Weidong;CHE Yuxuan;XING Limeng;LI Lini(College of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第10期3605-3614,共10页
High Voltage Engineering
基金
国家自然科学基金(51577159)。
关键词
电缆终端
局部放电
气隙缺陷
发展过程
相位谱图
ethylene-propylene rubber cable termination
partial discharge
cavity defect
propagation process
phase spectrum
作者简介
通讯作者:周利军,1978—,男,博士,教授,博导,从事电气设备状态检测与故障诊断方面的研究,E-mail:zhoulijun@swjtu.cn;白龙雷,1991—,男,博士生,从事电缆放电及故障诊断方面的研究,E-mail:longlei0107@163.com。
