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| 摘要: |
| 地铁主控系统的防雷接地保护能保证地铁主控系统的正常工作及地铁的稳定、高效及安全运营。在介绍地铁主控系统的基础上,针对实际系统中较典型的主控设备,给出了防雷的注意事项及建议,包括系统电源部分防雷、系统信号部分防雷和防止地电位反击;给出了接地防护的建议,包括工作接地及安全接地措施。建立了Matlab仿真模型,对雷电流击中建筑物的避雷系统时,电流在各线路与接地装置中的分配情况进行了仿真实验,并得出了引入无屏蔽电缆越长,对雷电流泄流越有利的结论。 |
| 关键词: 地铁,主控系统,防雷,接地 |
| DOI： |
| 分类号:TM86 |
| 基金项目: |
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| Lightning-proof and grounding techniques for subway main control system |
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ZHAO Jing HE Zheng-you QIAN Qing-quan
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| Abstract: |
| Lightning-proof and grounding protection ensures normal conditions of subway main control system as well as the stable,high efficient and safe operation of subway.Based on the introduction of subway main control system,notices and suggestions on lightning-proof measures are presented for main parts of control devices,such as power supply and system signal,as well as the prevention of earth potential retorting.Advices are given for grounding protection,including working grounding and safety grounding.With a Matlab simulation model,the surge current distribution in low-voltage system and grounding system during a lightning stroke on the lightning conductor of building is studied.Conclusion is that long unshielded cable is favorable for the lightning-stroke current discharge. |
| Key words: subway,main control system,lightning protection,grounding |
