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Analysis of stray current, track-to-earth potentials and substation negative grounding in DC traction electrification system

Analysis of stray current, track-to-earth potentials and substation negative grounding in DC traction electrification system,10.1109/RRCON.2001.921758

Analysis of stray current, track-to-earth potentials and substation negative grounding in DC traction electrification system   (Citations: 10)
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In the first part of the paper, we look at a stray current model under the ideal conditions with uniformly distributed track-to-earth resistances and develop the track-to-earth potentials and stray current relationships within a segment of track. We then expand the model to include buried metallic structures in the vicinity of the track using field theory to calculate the potential gradients generated due to flow of rail current and show that a potential difference experienced by a crossing or paralleling underground structure that traverses these gradients could cause stray current corrosion. We discuss the limitations of these models with the actual conditions such as nonuniform back-to-earth resistances, nonuniform soil resistivities. In the second part, we look at the stray current model when there are inadvertent breakdowns in the track insulation. The points of rail insulation breakdown may be approximated using the spherical ground electrode model and equipotential lines to illustrate the flow of stray current. Common grounding of the substation negative bus, substation AC ground mat and electric utility neutral are examined and discussed
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    • ...Furthermore, other studies regard the analysis of stray-current and the evaluation of maximum potential referred to particular transportation service conditions [9]-[11]...

    M. Brennaet al. Effects of the DC stray currents on subway tunnel structures evaluated...

    • ...In the mass rail transit (MRT) systems the current required by the train will be up to thousands amperes [2, 3, 4]. Therefore, a significant voltage drop appears on the running rails -this voltage level could reach to 60- 100 volts-[2, 5], as a result, the current leaks from the rail and flows into parallel circuits either directly through the soil or through buried conductors before returning onto the rail and the negative terminal of the ...
    • ...There are different ways to model the rail like finite cell modeling [11] and radial feed circuit model [5] and etc...

    Reza Fotouhiet al. A new novel DC booster circuit to reduce stray current and rail potent...

    • ...In the mass rail transit (MRT) systems the current required by the train will be up to thousands amperes [2, 3, 4]. Therefore, a significant voltage drop appears on the running rails this voltage level could reach to 60-100 volts-[2, 5], as a result, the current leaks from the rail and flows into parallel circuits either directly through the soil or through buried conductors before returning onto the rail and the negative terminal of the ...
    • ...There are different ways to model the rail like finite cell modeling [10] and radial feed circuit model [5]...

    Reza Fotouhiet al. A new novel power electronic circuit to reduce stray current and rail ...

    • ...smaller segments called cells, with each cell representing the conductivity by a resistance connected at a single point (see [11, 12])...

    Mehmet Turan Set al. Controlling Rail Potential of DC Supplied Rail Traction Systems

    • ...In addition, the diodes at the negative bus of the DC traction substation also provide a low impedance path for short-circuit current, which helps to achieve easy and fast identification of ground faults[2]...

    Bih-Yuan Kuet al. Computation and validation of rail-to-earth potential for diode-ground...

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