高速铁路电缆接地方式对护层感应电压的影响  

Influence of high-speed railway cable grounding mode on the induced voltage of the cable sheath

作　　者：易志兴 曹晓斌[1] 吴广宁[1] 陈奎[1] 杨佳[2] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《铁道科学与工程学报》2014年第6期109-115,共7页Journal of Railway Science and Engineering

基　　金：高速铁路综合雷电防护关键技术研究项目(Q024131104010072)

摘　　要：当高速铁路馈线电缆运行时，其线芯会有交变电流通过，并在馈线电缆金属护层产生感应电动势，当感应电动势过大时，会危及人身安全，降低电缆的绝缘性能，甚至于影响电缆的正常运行。为研究该电动势的影响因素和接地方式的影响规律，利用PSCAD／EMTDC仿真软件建立电缆模型及高速铁路全并联AT供电系统模型，仿真分析电缆在单端接地、中点接地和交叉互联接地方式下的护层感应电压及接地电流。研究结果表明：高速铁路馈线电缆在敷设长度小于1．1 km时，宜采取单端接地方式；长度为1．1～1．9 km时，宜采取中间直接接地方式；长度大于1．9 km时，宜采用交叉互联接地方式，为工程中电缆护层的接地提供参考。In the operation of the high-speed railway feeder cable,an alternating current flows through its con-ductor,and the feeder cable metal sheath will produce inductive electromotive force.When the inductive electro-motive force is too large,it will endanger personal safety,reduce the insulation performance of the cable,and e-ven affect the normal operation of the cable.In order to research the influence factors of the electromotive force, as well as the influence of grounding mode,this paper aims to establish the high-speed railway all-parallel AT traction power supply system model based on PSCAD/EMTDC simulation software,which was utilized to analyze the induced voltage and grounding current of cable sheath under the condition of single-grounded mode,mid-point-grounded mode,cross connection grounding mode.The research results show that the high-speed rail-way feeder cable shall be grounded with single-grounded mode when the cable length is up to 1 .1 km.If the cable length is between 1 .1 km and 1 .9 km,midpoint-grounded mode can be favorable,while cross connection grounding mode is recommended for the cable length longer than 1 .9 km.The research findings obtained in this paper provide reference for the cable sheath grounding problems in the similar engineering.

关 键 词：高速铁路 馈线电缆 接地方式 电缆护层 感应电压 

分 类 号：TM247.1[一般工业技术—材料科学与工程]