Modeling “Wrong Side” Failures Caused by Geomagnetically Induced Currents in Electrified Railway Signaling Systems in the UK

IF 3.7 2区 地球科学
Space Weather Pub Date : 2023-12-11 DOI:10.1029/2023sw003625
C. J. Patterson, J. A. Wild, D. H. Boteler
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Abstract

The majority of studies into space weather impacts on ground-based systems focus on power supply networks and oil and gas pipelines. The effects on railway signaling infrastructure remain a sparsely covered aspect even though these systems are known to have experienced adverse effects in the past as a result of geomagnetic activity. This study extends recent modeling of geomagnetic effects on DC signaling for AC-electrified railways in the UK that analyzed “right side” failures in which green signals are turned to red. The extended model reported here allows the study of “wrong side” failures where red signals are turned green: a failure mode that is potentially more dangerous. Railway lines using track circuit signaling, like those modeled in this study, are separated into a number of individual blocks. This study shows that a relay is most susceptible to “wrong side” failure when a train is at the end of a track circuit block. Assuming that each train is positioned at the end of the block it is occupying, the results show that the geoelectric field threshold at which “wrong side” failures can occur is lower than for “right side” failures. This misoperation field level occurs on a timescale of once every 10 or 20 years. We also show that the estimated electric field caused by a 1-in-100 years event could cause a significant number of “wrong side” failures at multiple points along the railway lines studied, although this depends on the number of trains on the line at that time.
英国电气化铁路信号系统地磁诱导电流导致的 "错边 "故障建模
关于空间气象对地面系统影响的研究大多侧重于供电网络和油气管道。对铁路信号基础设施的影响仍然是一个很少涉及的方面,尽管已知这些系统过去曾因地磁活动而受到不利影响。本研究扩展了最近对英国交流电气化铁路直流信号的地磁影响建模,该建模分析了绿色信号变为红色的 "右侧 "故障。本文报告的扩展模型允许研究红色信号变为绿色信号的 "错误侧 "故障:这是一种潜在危险性更大的故障模式。使用轨道电路信号系统的铁路线路,如本研究中的模型,被分成许多单独的区块。本研究表明,当列车位于轨道电路区块的末端时,继电器最容易发生 "错边 "故障。假设每列列车都位于其所占用区块的末端,结果表明发生 "错边 "故障的地电场阈值低于发生 "右边 "故障的阈值。这种错动场水平每 10 年或 20 年出现一次。我们还表明,100 年一遇的事件造成的估计电场可在所研究的铁路线沿线的多个点造成大量 "错边 "故障,尽管这取决于当时铁路线上的列车数量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
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29.70%
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166
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