The IEC 62128-2 (EN 50122-2) indicates methods for the measurement of rail-to-earth conductance and insulating rail joint efficiency in dc electrified railways. These methods are reviewed, considering the influence of system parameters on the accuracy and variability of results. This work reports a characterization and quantification of the uncertainty and limits of validity, as well as some practical considerations on the execution of measurements

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IEC 62128-2 [6] proposes and describes in its Appendix A, section A.3, a track conductance measurement method, shown in the schematic in Figure 1. Its use is suggested in the case of a ABSTRACT One of our previous studies, published in the ACTA IMEKO journal, pointed out the probable variability in track-to-ground conductance measurements due to the use of the method indicated in A.3 of the international standard IEC 62128-2. In this work, the presence of measurement variabilities due to the 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 was proven by on-site measurements. A simulation model that includes undesirable soil conditions is proposed and used herein in the estimation of the correct value of track-to-ground conductance using the measured values.

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Abstract. Methods for the measurement of track insulation are reviewed pointing out minimum necessary conditions and practical aspects, as well as consistency and repeatability of results. Track configuration, need of electrical sectioning and use of external electrodes or conductive structure are key parameters to determine suitable methods.