Abstract
In connection with electromagnetic interference influence on the track circuits, the purpose of the research is finding the means to increase the noise immunity of an audio frequency track circuit. The authors propose a new engineering solution, which enables reducing the effect of noises on the input of the track receiver in the intervals between signal current pulses. The proposed noise-immune audio frequency track circuit is based on inserting a delay line, an adjustable single-pulse generator and a controlled electronic switch into the existing audio frequency track circuit equipment. To analyze its efficiency, the operation of the audio frequency track circuit was simulated under conditions of traction current disturbances, impulse and fluctuation interferences with the known parameters. The results show that proposed device for railway transport allows to increase a signal-to-noise ratio on the track receiver input from 8% to 30%, depending on the interference parameters and the level of the useful signal.
Highlights
Track circuits belong to the most popular systems to provide information on position and movements of trains and ensure safety of the railway transportation process [1, 2]
This article proposes a device for improving noise immunity of an audio frequency track circuit with the centralized equipment arrangement, which contributes to reduction of the effect of interference on the input of the track receiver in the intervals between the signal current pulses
The reliability of the railway automatics systems which are responsible for the safety of the transportation process depends on the noise immunity of the track circuit
Summary
Track circuits belong to the most popular systems to provide information on position and movements of trains and ensure safety of the railway transportation process [1, 2]. Interference caused by the operation of asynchronous traction motors with impulse control, which most new types of electric rolling stock are equipped with, is dangerous for the operation of audio frequency track circuits. Their operation causes broadband electrical noise in the reverse traction current circuit, which are within the operating frequency range of these track circuits [16,17,18,19]. The operation of audio frequency track circuits when exposed to different interferences was simulated
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