摘要
雷电流在接触网上产生雷击过电压,对牵引系统安全运行造成隐患。传统氧化锌避雷器(metal oxide surge arrester,MOA)存在耐冲击能力差、放电特性较差及内部漏电流等问题,当高架接触网遭受雷击时,会造成避雷器击穿及接触网绝缘子闪络。针对此问题,提出了采用外串联间隙型避雷器(external series gap arrester,ESGA)防护措施。利用其间隙放电特性对接触网上的雷击过电压进行限制,保证接触网正常运行。采用接地网建模方法对高架桥牵引系统接地冲击阻抗进行等效,并建立高架区段接触网系统等值电路。通过对两种不同类型的避雷器以及接触网雷击跳闸率仿真,结果表明,采用间隙型避雷器的防护放电特性和耐雷击特性更强,雷击跳闸率更低。
Lightning current produces lightning overvoltage on the contact net,thus posing potential dangers to the safe operation of the traction system.Due to the fact that the traditional metal oxide surge arrester(MOA)is characterized with such flaws as poor impact resistance,low discharge efficiency and potential internal leakage current,lightning arrester breakdown and catenary insulator flashover will occur when the overhead catenary is struck by lightning.In view of this problem,by adopting external series gap arresters(ESGA)protection measures,the lightning overvoltage of OCS can be limited by its gap discharge characteristics,thus ensuring the normal operation of OCS.The grounding impulse impedance of viaduct traction system is equivalent by adopting grounding grid modeling method,thus establishing the equivalent circuit of overhead section catenary system.Based on a comparison of the lightning trip rate of two different types of arresters and catenary,the simulation results show that the gap arrester is characterized with an improved protective discharge characteristics and lightning resistance characteristics,as well as a lower lightning trip rate.
作者
丁俭
文定都
张阳
DING Jian;WEN Dingdou;ZHANG Yang(College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《湖南工业大学学报》
2022年第2期24-33,共10页
Journal of Hunan University of Technology
基金
湖南省自然科学基金资助项目(2021JJ30217)。
关键词
高架桥
接触网
雷击过电压
雷击跳闸率
外串联间隙型避雷器
接地网建模
viaduct
catenary
lightning overvoltage
lightning trip rate
external series gap arrester,ESGA
grounding network modeling
