Methods calculation for station tonal rail circuits with current receiver

Abstract

At present, at stations, for controlling station sector mainly applied phase-sensitive and tonal track circuits with insulating joints. One of the disadvantages of currently used tonal track circuits without insulating joints is that when the train approaches the controlled section, train begins to shunt this section at some distance before entry on it. This distance depends on many variables and constantly changes depending on these variables. To eliminate this drawback, it is proposed to use a current track receiver instead of the traditional potential receiver, which has a clear boundary for fixing the train entrance to the controlled section. By the present time, methods have been developed and are used to determine the main analytical expressions for the analysis and synthesis of tonal track circuits with potential receivers in various modes of operation, and the theoretical issues of tonal track circuits with current receivers were practically not considered, in this connection, the article discusses the development of mathematical models for determining the absolute shunt sensitivity of tonal track circuits without insulating joints with current receivers and calculation methods for determining the critical point of minimum shunt sensitivity. The obtained expressions differ from the well-known equations of absolute shunt sensitivity and the critical point of the minimum value of shunt sensitivity and will allow for analysis, synthesis and design of tonal track circuits without insulating joints with current receivers, which will increase the safety of train traffic.