Stray Current Control in DC Mass Transit Systems

Sch. of Electr. Eng. & Electron., Univ. of Manchester, UK
IEEE Transactions on Vehicular Technology (Impact Factor: 1.98). 04/2005; 54(2):722 - 730. DOI: 10.1109/TVT.2004.842462
Source: IEEE Xplore

ABSTRACT Stray current control is essential in direct current (DC) mass transit systems where the rail insulation is not of sufficient quality to prevent a corrosion risk to the rails, supporting and third-party infrastructure. This paper details the principles behind the need for stray current control and examines the relationship between the stray current collection system design and its efficiency. The use of floating return rails is shown to provide a reduction in stray current level in comparison to a grounded system, significantly reducing the corrosion level of the traction system running rails. An increase in conductivity of the stray current collection system or a reduction in the soil resistivity surrounding the traction system is shown to decrease the corrosion risk to the supporting and third party infrastructure.

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    • ", reduction of distance between TPSs, selection system with optimized traction current, utilization of fourth rail [7] and welding the rails to each other. Each of the mentioned methods have much effect on reduction of stray current and corrosion [8] [9] [10] [11]. In this paper, evaluation of distance between the TPSs and increase resistance between the rail and the ground is discussed that it will be explained in next sections. "
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    ABSTRACT: In DC-electrified railway systems, rails are used to navigate trains as well as providing the returning path of train’s electric current to the traction power substation (TPS). Due to electrical resistance of rails and the conductivity between rail and ground, a part of train returning current to the TPS permeate in the ground which causes different problems like increasing of rails potential that increase of rails potential leads to death hazards for the train station personnel and stray current increment causes metal’s corrosion and decrease of their lifetime. Therefore, surveying electric railway system in order to know the unfavorable effects of rails potential and stray currents is an essential matter. In this paper, effect of control methods on stray current and rail potential amount and analysis of this current with Finite Element Method (FEM) is presented.
    4th International Conference on Recent Advances in Railway Engineering (ICRARE2015), Tehran, Iran; 05/2015
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    ABSTRACT: This paper studies the effects of different grounding strategies, including ungrounded, solidly grounded, and diode grounded on rail potential and stray currents in the Taipei Rail Transit Systems (TRTS). The TRTS is a dc transit railway and the running rails are used as the return conductor for traction currents. The advantage is that no dedicated return conductor is required while the disadvantages are rail potential and stray current problems. Thus, the analysis of grounding strategies is important and necessary. Sample simulation results for the red line between Tamshui (R33) and Chuwei (R31) stations are presented
    IEEE Transactions on Power Delivery 11/2006; 21(4-21):1941 - 1947. DOI:10.1109/TPWRD.2006.874561 · 1.73 Impact Factor
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