Abstract
This paper deals with the sensitivity of the input impedance of an open track circuit in the event that the parameters of the track are changed. Weather conditions and the state of pollution are the most common reasons for parameter changes. The results were obtained from the measured values of the parameters R (resistance), G (conductance), L (inductance), and C (capacitance) of a rail superstructure depending on the frequency. Measurements were performed on a railway siding in Orlova. The results are used to design a predictor of occupancy of a track section. In particular, we were interested in the frequencies of 75 and 275 Hz for this purpose. Many parameter values of track substructures have already been solved in different works in literature. At first, we had planned to use the parameter values from these sources when we designed the predictor. Deviations between them, however, are large and often differ by three orders of magnitude (see Tab.8). From this perspective, this article presents data that have been updated using modern measurement devices and computer technology. And above all, it shows a transmission (cascade) matrix used to determine the parameters.
Highlights
In this article, the results of measuring the parameters of rail traction - the resistance of the track circuit, the conductance between the rails, and the inductance and the capacitance of the track circuit - are described
The sensitivity of the input impedance of the track circuit is calculated after changing the parameters of the track
The modified Ohm impedance measurement method was used in the measurement
Summary
The results of measuring the parameters of rail traction - the resistance of the track circuit, the conductance between the rails, and the inductance and the capacitance of the track circuit - are described. The sensitivity of the input impedance of the track circuit is calculated after changing the parameters of the track. These parameters were investigated to design the predictor, which detects the occupancy of the rail traction. Elaboration of the results must provide parameter values in a form which can be directly used in a laboratory simulation of track circuits. This simulator was assembled from type two-ports (parameters G, R, L, C) and it was used to verify the device characteristics to predict the occupancy of the track circuit. This parameter will be determining during the calibration of the instrument
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