Modeling of Stray Currents From Metro Intruding Into Power System Considering the Complex Geological Conditions in Modern Megacities

Li, Chunmao; Du, Qing; Guo, Yujun; Liu, Yijie; Yang, Feng; Chen, Lu; Zhang, Xueqin; Huang, Guizao; Gao, Guoqiang; Wu, Guangning

doi:10.1109/tte.2022.3179559

Cited by 14 publications

(5 citation statements)

References 25 publications

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“…This phenomenon indicates that the neutral current situation at station E improves as the resistance of the other devices increases. The transformer‐neutral current anomalies in different substations are related to the potential developed by the metro system in its soil environment [13]. So it is difficult to see from the results alone which scheme is more suitable for this calculation example.…”

Section: Systematic Protection Solutionmentioning

confidence: 99%

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Systematic protective scheme for mega‐city power systems against stray currents caused by metro systems

Guo

Liu

et al. 2023

High Voltage

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In modern megacities, stray currents from metro systems intrude into multiple transformers' neutral points becoming a potential threat to the high‐capacity transformers. Neutral current anomalies are exacerbated in unprotected substations when we instal guards at single stations. This paper presents a system protection strategy for multiple substations affected by stray currents in modern megacities. The model, taking Shanghai as an example, includes the spatial distribution information of the urban electrical energy transmission structure, the power system, and the metro system. A Particle swarm algorithm is used to calculate the resistance values of the devices for each station. Further stability tests are performed to select the optimal protection solution. The results show that when protection is considered as a system, the protection runs well and the neutral current level remains below the unprotected level when the protection fails at a single station or multiple stations.

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Section: Systematic Protection Solutionmentioning

confidence: 99%

“…Stray currents vary with the traction state of the metro vehicle [12]. This also has a coupling with the transformer neutral current [13]. It is proposed that soil resistance and traction status are the key factors affecting stray current [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Systematic protective scheme for mega‐city power systems against stray currents caused by metro systems

Guo

Liu

et al. 2023

High Voltage

Self Cite

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“…Subway stray current has the characteristics of a complex propagation path and a wide influence range [2]. If no stray current collection device is installed at a subway depot, some of the stray current leaking from the mainline will converge at the depot, causing serious corrosion to the structural reinforcement of the station and the buried metal [3]. This situation jeopardizes the normal operation of the subway train and the safety of the passengers.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Stray Current Leakage in Subway Traction Power Supply System Based on Field-Circuit Coupling

Lin,

Tang,

Chen

et al. 2024

Energies

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In a rail transit system, there is a constant leakage of current from the subway rails to the earth, and these stray currents have complex propagation paths and a wide range of influence. Since no stray current collection devices are installed at subway depots, some of the stray current leaking from the mainline will converge at the depot, seriously corroding the structural reinforcement and buried metal of the station, thereby jeopardizing the normal operation of subway trains and passenger safety. In this paper, a field-circuit coupling method is proposed to analyze the current leakage and distribution law of the subway mainline and depot. It is found that the failure of the gauge block at the mainline will trigger the maximum leakage of rail current. Additionally, it is observed that the stray current distribution at the depot is mainly influenced by the operating status of the one-way conduction device (OWCD) and the change of rail potential. These results validate the applicability and effectiveness of the field-circuit coupling method proposed in this paper and provide new technical support for the study of stray current leakage distribution in subways.

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“…All electrified transportation systems (ETSs) of the guideway type are affected by return current leakage from the guiding track into the soil, coupling to structures nearby. Examples of victims are sleepers and the track bed [1][2][3], platform screen doors and other metallic parts at platforms [4], viaducts, bridges and building foundations [5,6], pipelines and reservoirs [7][8][9], etc., as well as corrosion of power earthing systems and saturation of transformers [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Uncertainty of Standardized Track Insulation Measurement Methods for Stray Current Assessment

Bhagat

Bongiorno

Mariscotti

2023

Sensors

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Stray current is a relevant phenomenon in particular for DC electrified transportation systems, affecting track and infrastructure within the right of way and other structures and installations nearby. It worsens with time and the level of protection depends on timely maintenance, as well as correct design choices. The assessment of track insulation is the starting point for both stray current monitoring systems and at commissioning or upon major changes. Standardized methods (ref. EN 50122-2 or IEC 62128-2) have been almost unchanged in the last 20 years but suffer from accuracy issues and variability due to parameters and conditions not under the operator’s control. The uncertainty of test methods is increasingly important now that contractual specifications require a high level of insulation for new systems. A critical discussion and analysis of the sources of variability and practical constraints is proposed, followed by an evaluation of uncertainty, with the objective not only to assess the accuracy of the provided results, but also to foster research on innovative, more flexible and accurate methods.

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Modeling of Stray Currents From Metro Intruding Into Power System Considering the Complex Geological Conditions in Modern Megacities

Cited by 14 publications

References 25 publications

Systematic protective scheme for mega‐city power systems against stray currents caused by metro systems

Systematic protective scheme for mega‐city power systems against stray currents caused by metro systems

Analysis of Stray Current Leakage in Subway Traction Power Supply System Based on Field-Circuit Coupling

Uncertainty of Standardized Track Insulation Measurement Methods for Stray Current Assessment

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