Stray current assessment for DC transit systems based on modelling of earthing and bonding

Chuchit, Tawat; Kulworawanichpong, Thanatchai

doi:10.1007/s00202-019-00758-0

Cited by 18 publications

(7 citation statements)

References 10 publications

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“…(4) Uncertainty mainly influenced by the offset temperature coefficient. (5) The "rated insulation voltage 50 Vrms" statement in probe datasheet [35]…”

Section: Current Rangementioning

confidence: 99%

“…Corrosion induced by stray current (SC) is a significant problem of electrified transportation systems (ETSs) and has attracted a lot of attention, especially for systems operated at dc, such as light railways, metros and rapid transit in general: general system analysis [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] including design optimization and defects [ 8 , 9 ], impact on buried conductive pipes [ 10 , 11 ], with both deterministic and stochastic approaches [ 12 , 13 ]. A marginal impact may be expected also for ac railways [ 14 , 15 ], but the lower intensity of the traction current and the lesser impact of ac on the chemical mechanism of corrosion make it a less relevant problem.…”

Section: Introductionmentioning

confidence: 99%

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Stray Current Protection and Monitoring Systems: Characteristic Quantities, Assessment of Performance and Verification

Mariscotti

2020

Sensors

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Electrified transportation systems (ETSs) are affected by stray current problems impacting within and outside the right of way on reinforcement, buried metal structures and foundations. Stray current protection systems have recently been integrated in the track structure. Track electrical quantities are, thus, usually measured to assess track insulation and protection efficiency but should be backed up by additional measurements at the affected structures and installations, in order to assess their exposure and risk of corrosion. Ideally, a stray current monitoring system proceeds from the measurement of these quantities, to data collection and archival, to data presentation, analysis and prediction. Feasible sensors and probes, the impact of environmental conditions and uncertainty are considered for the measurement at the physical level. Data analysis is critically reviewed considering the variability of operating conditions and the effectiveness of each quantity as indicator of track insulation and protection efficiency. Given the normal spread of values, for data presentation and interpretation, suitable techniques are considered based on averaging, curve similarity and feature extraction, and also for the task of assessing compliance to limits or reference values and establishing a trend that may drive informed maintenance decision.

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“…(4) Uncertainty mainly influenced by the offset temperature coefficient. (5) The "rated insulation voltage 50 Vrms" statement in probe datasheet [35]…”

Section: Current Rangementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stray Current Protection and Monitoring Systems: Characteristic Quantities, Assessment of Performance and Verification

Mariscotti

2020

Sensors

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“…In many cases, rails are not sufficiently insulated so current leaks from rails and passes through the load bearing layer, where this layer behaves like an electricity conductor or electrolyte [39].…”

Section: Rail-to-earth Resistance In Case Of Embedded Tracksmentioning

confidence: 99%

Corrosion and stray currents at urban track infrastructure

2020

JCE

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Corrosion and stray currents at urban track infrastructureRails are a part of track structure where corrosion process inevitably occurs, except if they are fully insulated and devoid of contact with any other part of the structure (sleepers, fastening accessories) or electrolyte like moist soil or water in track structure. Corrosion occurs much faster in the presence of stray currents, which very soon results in the loss of material at the rail foot. The paper presents an overview and description of parameters influencing stray current levels, such as electrical potential in rail and longitudinal rail conductivity, rail-to-earth electrical resistance, electrical conductivity of load-bearing concrete layers of truck structure, and electrical conductivity of soil.

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“…1, a power circuit of subway vehicles is formed by DC traction substations, overhead catenary system, and return-flow system. However, the rail cannot be completely insulated from the earth as a return conductor, and part of the return current flowing through the rail will leak to the earth, which becomes stray current [1], [2]. In the process of stray current flow into buried metallic structure before returning to the negative of the substation, the buried metal is electrolyzed due to the electrochemical corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…At present, a large number of analytical models focus on the distribution of stray current, such as resistance network models, electric field models, potential gradient models and hemispherical electrode models [14]- [18]. With the deepening of research, simulation software such as Simulink, CEDGS, and FEM software are also widely used to study the distribution of stray current [1], [19]- [22]. By comparison with the traditional models, the simulation models can reduce oversimplification, which provide effective tools for analyzing the distribution of stray current under complex environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of DC-Subway Stray Current Corrosion With Integrated Multi-Physical Modeling and Electrochemical Analysis

2019

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Leakage of stray current can cause serious problems by accelerating the corrosion process of a buried pipeline in the subway. A multi-physical finite element model of the DC-subway traction system was established in this study, and the dynamic process of the stray current corrosion on buried pipeline was calculated according to the real time traction conditions. In this study, the corrosion rate variation of stray current is evaluated, and the corrosion trend of stray current is quantitatively calculated. The model simulation shows that the stray current corrosion is significantly higher than other processes during the acceleration process of the subway locomotive. And the potential of the buried pipeline reaches a maximum value when an up-rush of traction current occurs. The corrosion is mainly concentrated in the anode region of the buried pipeline, and the closer the buried pipeline is to the rail the more serious the corrosion is. A corrosion experiment of N20 carbon steel was carried out and verified by finite element model. The results further show that the finite element model can quantitatively calculate and predict the mass loss of buried metal caused by stray current corrosion.

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Stray current assessment for DC transit systems based on modelling of earthing and bonding

Cited by 18 publications

References 10 publications

Stray Current Protection and Monitoring Systems: Characteristic Quantities, Assessment of Performance and Verification

Stray Current Protection and Monitoring Systems: Characteristic Quantities, Assessment of Performance and Verification

Corrosion and stray currents at urban track infrastructure

Evaluation of DC-Subway Stray Current Corrosion With Integrated Multi-Physical Modeling and Electrochemical Analysis

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