高速铁路电缆接地方式对护层感应电压的影响

发布时间：2018-10-13 13:40

【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1.1km时,宜采取单端接地方式;长度为1.1~1.9km时,宜采取中间直接接地方式;长度大于1.9km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。
[Abstract]:When the high speed railway feeder cable is running, the wire core will have alternating current passing through, and the inductive electromotive force will be produced in the metal protective layer of the feeder cable. When the inductive electromotive force is too large, the personal safety will be endangered and the insulation performance of the cable will be reduced. Even affect the normal operation of the cable. In order to study the influence factors of the EMF and the influence law of the grounding mode, the cable model and the AT power supply system model of the whole parallel connection of high-speed railway are established by using the PSCAD/EMTDC simulation software, and the cable in the single terminal is simulated and analyzed. The inductive voltage and grounding current of the protective layer under the neutral grounding and cross-connected grounding mode. The results show that when the laying length of feeder cable of high-speed railway is less than 1.1km, it is appropriate to adopt the mode of single terminal ground connection; when the length of feeder cable is 1.1~1.9km, it is appropriate to adopt direct grounding mode; when the length of feeder cable is longer than 1.9km, it is appropriate to adopt the way of interconnecting grounding. It provides a reference for the earthing of cable protective layer in engineering.
【作者单位】：西南交通大学电气工程学院;中铁二院工程集团有限责任公司;
【基金】：高速铁路综合雷电防护关键技术研究项目(Q024131104010072)
【分类号】：TM75

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