Article

Stray current control in DC mass transit systems

Sch. of Electr. Eng. & Electron., Univ. of Manchester, UK
IEEE Transactions on Vehicular Technology (Impact Factor: 2.64). 04/2005; 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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