津秦客运专线信号电缆受电磁影响测试与分析

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摘要研究目的:高速铁路沿线的信号电缆会受到牵引供电系统电磁危险影响。本文结合津秦客专联调联试，在唐山牵引变电所供电区段对一段2. 7 km铁路信号电缆进行感应电压测试，设置电缆屏蔽层单端接地和双端接地，测试不同速度级正常行车情况下和接触网短路故障情况下,信号电缆芯线和屏蔽层的感应电压（电流）为评估高速铁路信号电缆受电磁干扰影响程度以及优化今后信号电缆电磁防护设计提供依据和参考。
研究结论:（1)津秦客运专线正常行车情况下信号电缆芯线感应电压可达36 V,接触网故障情况下可达 360 V；(2)目前信号电缆采用每3 km分段单端接地的设计方案在接触网正常运行情况下满足电磁干扰防护要求;（3)电缆近侧线路负荷产生的纵向感应电动势为远侧线路的1.3倍，牵引网直供方式产生的纵向感应电动势为全并联AT供电方式的4倍以上;（4)测试电缆屏蔽层双端接地时，对回流的分流很小,但同时在接触网发生短路故障时存在造成电缆烧损的风险，因此应根据信号电缆信息传输可靠性要求等级以及线路的具体情况来合理选择屏蔽层接地方式;（5)本研究成果能够为高速铁路信号电缆接地方式的选择和电磁兼容设计提供指导和参考。

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	常媛媛1
	吴命利2
	韦继肖3

关键词 ：高速铁路, 信号电缆, 电磁影响, 牵引供电系统

Abstract：Research purposes ： The signal cables along high speed railway are always affected by the traction power supply system. Combined Tianjin - Qinhuangdao Passenger Dedicated Line's alignment joint - test，we took a series of test measuring the induced voltage on signal cable by an electromagnetic interference causing from the traction power supply system. The length of the testing cable is 2. 7 kilometers， and we set two kinds of shielding layer grounding mode，one is single ended grounding， the other is double ended grounding. The signal cable s voltage and current of both core wire and shielding layer were tested under the condition of traction power supply s normal operation and short - circuit fault condition. This paper can offer rich data and effective analysis on the field of electromagnetic influence from traction power supply and the signal cable electromagnetic protection design.
Research conclusions:(1 ) The core wire's induced voltage can reach to 36 V under the normal condition of contact line，360 V under the fault condition. (2)The design specification that making shielding layer signal ended grounding every 3 kilometers is tolerable in electromagnetic protection design under connect line's normal operation condition.(3) Longitudinal induction electromotive force produced by the cable side line load is 1. 3 times of the far side line， longitudinal induction electromotive force produced by the direct feeding power supply system is more than 4 times of the all parallel AT power supply mode. (4) When the shielding layer was double end grounding，the induced voltage can fall to half of the former value，but there will be current flowing in the shielding layer and the current will cause dangerous when the contact line was short circuited. So we should chose different grounding method according to the safety level requirement of signal cable and special condition of railway line. (5) This research result can provide guidance and reference for signal cable grounding method selection and electromagnetic compatibility design of high speed railway.

Key words： high speed railway signal cable electromagnetic influence traction power supply system

收稿日期: 2015-06-08

作者简介: 常媛媛，１９８２年出生，女，工程师。

引用本文:

常媛媛1,吴命利2,韦继肖3. 津秦客运专线信号电缆受电磁影响测试与分析[J]. 铁道工程学报, 2015, 32(9): 92-96.
CHANG Yuan - yuan1，WU Ming - li2，WEI Ji - xiao3. Test and Analysis of the Electromagnetic Influence of Signal Cable on Tianjin - Qinhuangdao Passenger Dedicated Railway Line. Journal of Railway Engineering Society, 2015, 32(9): 92-96.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2015/V32/I9/92

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