Calculation methods for station tonal current receiving rail circuits

Abstract

Currently, phase-sensitive and tonal track circuits are mainly used for monitoring station sections at stations. One of the disadvantages of currently used tonal track circuits without isolating links is that when a train approaches a controlled section, it begins to close this section at a certain distance before entering it. This distance depends on many variables and is constantly changing depending on these variables. To overcome this disadvantage, it is proposed to use a current track receiver instead of a traditional potential receiver with a clear threshold to record the entry of a train into a controlled section. To date, methods for determining the main analytical expressions for analyzing and synthesizing tonal track circuits with potential receivers in various operating modes have been developed and applied. Although the theoretical issues of tonal rail circuits with current collectors have not been considered in practice, in this regard, the article considers the issues of developing mathematical models for determining the absolute shunt sensitivity of tonal rail circuits without isolating the links with current collectors and methods for calculating the critical point of the minimum shunt sensitivity. The expressions obtained differ from the known equations of absolute shunt sensitivity and the critical point of the minimum value of shunt sensitivity and allow for the analysis, synthesis and design of tonal rail circuits without isolating the links with current collectors, which increases the safety of train traffic.