Influence of soil structures on corrosion performance of floating-DC transit systems

Charalambous, Charalambos A.; Cotton, Ian

doi:10.1049/iet-epa:20050449

Cited by 46 publications

(30 citation statements)

References 7 publications

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“…In a light rail system, stray currents deviating from the original return path are generated due to decreasing resistance in some areas and the blocked backflow system [1][2][3][4], which is explicitly shown in Figure 1. Differing from the traction current flowing back to the traction substation along the rails, the stray current will first flow into the underground and then flow back to the negative terminal of the traction substation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Model for the Scope of DC Interference Generated by Stray Currents in Light Rail Systems

Wang

et al. 2019

Energies

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Electrochemical corrosion caused by stray currents reduces the lifespan of buried gas pipelines and the safety of light rail systems. Determining the scope of stray current corrosion will help prevent the corrosion of existing buried pipelines and provide an effective reference for new pipeline siting. In response to this problem, in this paper the surface potential gradient was used to evaluate the scope of stray current corrosion. First, an analytical model for the scope of the stray current corrosion combined with distributed parameters and the electric field generated by a point current source was put forward. Second, exemplary calculations were conducted based on the proposed model. Sensitivity of the potential gradient was analyzed with an example of the transition resistance, and the dynamic distribution of surface potential gradient under different locomotive operation modes was also analyzed in time-domain. Finally, the scope was evaluated at four different intervals with the parameters from the field test to judge whether the protective measures need to be taken in areas with buried pipelines and light rail systems nearby or not.

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Section: Introductionmentioning

confidence: 99%

Evaluation Model for the Scope of DC Interference Generated by Stray Currents in Light Rail Systems

Wang

et al. 2019

Energies

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“…With time rail sections have been improved in cross section, length and the method of joining the two sections of rail. Increasing the cross-sectional area or size of the rail is achieved by using standard size rails ranging from 90 to 120 pounds (115 re tee is the commonly used rail with a longitudinal resistance of around 40-80 mΩ/km) (Cotton & Charalambous [9]).…”

Section: Rail Resistivity and Cross-bondingmentioning

confidence: 99%

Stray Current Corrosion Mitigation, Testing and Maintenance in Dc Transit System

Memon

Fromme

2016

WIT Transactions on State-of-the-Art in Science and Engineering

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Stray current corrosion in direct current (dc) transit systems occurs because of the mechanism of current transfer between metals and a conductive electrolyte such as concrete, soil and water. Stray current reactions can be considered as a special case in that the anode (point of current discharge) may be at a considerable distance from the cathode (point of current pickup). The risk of stray current corrosion arising from the operation of dc-powered transit system is difficult to eliminate completely. However, suitable design of dc traction power systems and structures carrying the railways can significantly reduce the risk of corrosion both to the transit system structures and third-party structures.Stray currents can cause safety risks, thus making the design of stray current mitigation, testing and maintenance an important element of the holistic design for a dc transit system. based on the results of the literature research, interviews with over two dozen dc rail transit systems, and testing of dc rail tracks, this paper presents and analyses various mitigation methods currently in use in the industry to control stray current corrosion. recommendations for the testing (monitoring) and maintenance procedures to keep the stray current leakage and the related corrosion in control are then presented.

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“…Accumulative corrosive stray charge represents the whole charge leaking off any point of the track when train travels between two end stations. According to [8] and [9] just positive stray current (i.e. current leaks off the rail) causes corrosion.…”

Section: B Accumulative Chargementioning

confidence: 99%

Effects of different earthing schemes on the stray current in rail transit systems

Jamali

Alamuti

Savaghebi

2008

2008 43rd International Universities Power Engineering Conference

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Running rails are used as return path for DC electrified rail transit systems. The resultant rail voltage causes stray current returning to the source via other paths such as metallic infrastructures. Stray current is the main reason of corrosion in the metallic parts which are located in the proximity of the railway. Many efforts have been made for controlling and reducing stray current. This paper discusses possible solutions for reducing stray current in Tehran Metro Line 3. Floating, diode earthed and solidly earthed schemes are various schemes for controlling stray current which are investigated here. Comparison of the rail voltage and stray current level for the mentioned schemes is presented. Also the stray charge and corrosive stray charge are investigated for Line 3. Finally multi train simulation study has been used to propose the best scheme for line 3.

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Influence of soil structures on corrosion performance of floating-DC transit systems

Cited by 46 publications

References 7 publications

Evaluation Model for the Scope of DC Interference Generated by Stray Currents in Light Rail Systems

Evaluation Model for the Scope of DC Interference Generated by Stray Currents in Light Rail Systems

Stray Current Corrosion Mitigation, Testing and Maintenance in Dc Transit System

Effects of different earthing schemes on the stray current in rail transit systems

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