Evaluation of electromagnetic interference on telecommunication cables from an AC railway line: Measurements and calculations

Abstract

The paper describes the main results of a field measurement campaign of the electromagnetic inte$erence produced by a 25 kV -50 Hz railway line on nearby telecommunication cables; the results of the measurements were compared with the results of calculations based on suitable circuit models for studying the inducing and induced systems. The results of the comparison were deemed satisfactory.

Discrete modeling and calculation of traction return-current network for 400 km/h high-speed railway

“…A. Mariscotti et al 11 considered the determination of the real distribution of the return-current in electric railway traction systems; and held that the definition of the transfer function between the return-current and the signaling circuit variables is an important element for the compatibility analysis between train detection systems, rolling stock, and infrastructure. Lucca et al 12 built a multi-conductor model to calculate the current and potential distribution of the main lines on the railway site and verified it through actual measurements. According to the reflux characteristics of the DC traction power system, Lin et al 13 studied the infinitesimal method based calculation of metro stray current in multiple power supply sections.…”

Filter Transients onboard DC Rolling Stock and Exploitation for the Estimate of the Line Impedance

“…Power Quality (PQ) in railways has been investigated from different standpoints: line voltage distortion coupled to other trains connected to the same line section or reflected back on the utility side [1]- [3]; current harmonics interfering with signaling and telecommunications [4]- [6]. Considering rolling stock and in a normative perspective, harmonics and distortion may affect the line voltage [7] or have impact also on the power and energy consumption assessment, both as an external unwanted interference [8] or as a contributing factor [9].…”

A survey of the 50 Hz interference impact of the Italian high speed railway line on extended metallic structures

“…If in, at least, one point of the route, the limits established by the applicable standard are exceeded, some protections measures are needed. We would like to point out that the validity of the models and of the calculation tool has also been checked by means of different field measurements obtaining a good agreement [10], [11], [12].…”