Abstract
A previous work, published in ACTA IMEKO journal, pointed out the probable variability in track to ground conductance measurements, performed by using the method indicated in the A.3 of the IEC 62128-2 international standard. In this work the presence of measurement variabilities, due to connection of the negative terminal of the power supply to an earthing electrode instead of the behind section and due to the location chosen for the voltage terminal, were proven by on site measurements. A simulation model, with the inclusion of not ideal soil is proposed and used to estimate the correct value of track to ground conductance from the measured values.
Highlights
The stray current phenomenon, significant for DC electrified transportation systems, is directly related to the insulation level of the traction current return path from surrounding structures and soil [1][2]
Some variabilities can be avoided by taking precautions when performing measurements, but others depend on contingency, site characteristics, the availability of connections, etc
A comparison with numerical simulations concerning the variability due to the resistance of the negative terminal of the power supply (PS) has shown that, in real cases, the variability is larger than numerical calculations predict
Summary
The stray current phenomenon, significant for DC electrified transportation systems, is directly related to the insulation level of the traction current return path from surrounding structures and soil [1][2]. As is commonplace, when performing measurements during the installation phases of a system [10], the installed tracks behind the measured section, which IEC 62128-2 identifies as the grounding path for the negative terminal of the power supply, may be unavailable. This negative terminal must be connected to grounded structures or to an electrode driven into the soil. The choice of location introduces variability in track-to-ground conductance measurement results This variability has been estimated in a simulation as being lower than 1 % of the measured value. The abovementioned variabilities are demonstrated and quantified using on-site measurements and are compared with the estimate obtained by the simulation
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