| Summary: | The article analyzes the operation of relative track circuits, which shows that they are able to provide reliable control of the state of the rail line in extreme climatic conditions. Reliable operation of relative track circuits can be carried out at very low values of insulation resistance, down to 0.1 Ohm km and below. The method of monitoring the state of the rail line, based on fixing the voltage of the receiving end before the train approaches and then determining the threshold values, significantly expands the range of changes in the insulation resistance, in which the normal operation of the track circuit is possible. The goal is to represent the track circuit, where the theory of the rail line is used according to the standard of the track circuit operating modes, at present many factors have not been taken into account for high-speed traffic, one of these is the transmission resistance with insulation resistance, the influence of disturbing and other factors. Mathematical modeling has been developed to determine the insulation resistance in various weather conditions.
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