Consideration of the influence of supports in modeling the electromagnetic fields of 25 kV traction networks under emergency conditions

IF 1.9 Q4 ENERGY & FUELS Global Energy Interconnection Pub Date : 2024-08-01 DOI:10.1016/j.gloei.2024.08.004
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Abstract

Single-phase 25 kV traction networks of electrified alternating current (AC) railways create electromagnetic fields (EMFs) with significant levels of intensity. The most intense magnetic fields occur when short circuits exist between the contact wire and rails or ground. Despite the short duration of exposure, they can adversely affect electronic devices and induce significant voltages in adjacent power lines, which is dangerous for operating personnel. Although numerous investigations have focused on modeling the EMF of traction networks and power lines, the challenge of determining the three-dimensional electromagnetic fields near metal supports during the flow of a short-circuit current through them is yet to be resolved. In this case, the field has a complex spatial structure that significantly complicates the calculations of intensities. This study proposes a methodology, algorithms, software, and digital models for determining the EMF in the described emergency scenarios. During the modeling process, the objects being studied were represented by segments of thin wires to analyze the distribution of the electric charge and calculate the intensities of the electric and magnetic fields. This approach was implemented in the Fazonord software, and the modeling results show a substantial increase in EMF levels close to the support, with a noticeable decrease in the levels as the distance from it increases. The procedure implemented in the commercial software Fazonord is universal and can be used to determine electromagnetic fields at any electrical power facility that includes live parts of limited length. Based on the proposed procedure, the EMF near the supports of overhead power lines and traction networks of various designs could be determined, the EMF levels at substations can be calculated, and the influence of metal structures located near traction networks, such as pedestrian crossings at railway stations, can be considered.

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在模拟紧急情况下 25 千伏牵引网络电磁场时考虑支架的影响
电气化交流 (AC) 铁路的单相 25 千伏牵引网络会产生强度很大的电磁场 (EMF)。当接触线与铁轨或地面之间存在短路时,就会产生强度最大的磁场。尽管暴露的时间很短,但它们会对电子设备产生不利影响,并在邻近的电力线中产生巨大的电压,这对操作人员来说是非常危险的。尽管大量研究都集中在牵引网和电力线的电磁场建模上,但确定短路电流流经金属支架时金属支架附近的三维电磁场这一难题仍有待解决。在这种情况下,电磁场具有复杂的空间结构,大大增加了强度计算的复杂性。本研究提出了在所述紧急情况下确定电磁场的方法、算法、软件和数字模型。在建模过程中,研究对象由细线段表示,以分析电荷分布并计算电场和磁场强度。这种方法已在 Fazonord 软件中实施,建模结果显示,靠近支架的电磁场水平会大幅上升,而随着距离的增加,水平会明显下降。商业软件 Fazonord 中实施的程序具有通用性,可用于确定任何包含长度有限的带电部件的电力设施的电磁场。根据建议的程序,可以确定架空电力线和各种设计的牵引网络支架附近的电磁场,计算变电站的电磁场水平,并考虑牵引网络附近的金属结构(如火车站的人行横道)的影响。
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来源期刊
Global Energy Interconnection
Global Energy Interconnection Engineering-Automotive Engineering
CiteScore
5.70
自引率
0.00%
发文量
985
审稿时长
15 weeks
期刊最新文献
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