SU1632850A1 - Rail circuit - Google Patents

Abstract

The invention relates to railway automation, in particular to rail circuits. The purpose of the invention is to increase reliability. When the rail circuit is occupied by a train, the current of the rail thread becomes branched: one part goes through the train shunt to another rail thread, and the other part continues to go along the rail thread. As a result, a current passes through one of the windings of the relay transformer 4, and an electromotive force is simultaneously induced in the other winding, creating a voltage on the track relay 6 that is close to zero. With low ballast resistance, the induced electromotive force in the other winding of the transformer 4 is sufficient to hold the relay cor 6 in the tightened position. 1 il.

Description

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The invention relates to railway automation, namely to rail chains.

The purpose of the invention is to increase reliability.

The drawing shows a schematic diagram of the track circuit.

The rail circuit contains a power transformer 1, one of the windings of which is connected via diode 2 and an additional diode 3 to the rails at one end of it, and at the other - rated transformer 4, one of which windings is connected to the rails, and the other the capacitor 5 and the relay relay 6 are connected in series, the other winding of the transformer 1 is connected to the power supply 7, one of the windings of the transformers 1 and 4 is made with average leads that are connected between each other,

Rail circuit operates as follows.

When the track circuit is free, in each half-cycle of alternating current, the electromotive force (EMF) arising in one of the windings of the transformer 4 is folded, which leads to the excitation of the relay 6.

In the event of a break of any rail filament or connecting wires, the current flows through the relay transformer 4, the induced emf in its one winding is insufficient to keep the core of the relay 6 in the attracted position.

When the car is occupied by a track, the track rail current branches; one part continues to go along the rail thread, and the other part goes through the wheel sets (train shunt) to the other rail thread. As a result, a current passes through one of the windings of relay transformers 4 at the same time;

The EMF (opposite direction), in total, creates at the terminals of the track relay b a voltage close to zero. Anchor at the relay disappears.

With low ballast resistance, a similar phenomenon occurs with the difference that the induced emf in the other winding of the relay transformer differs significantly in magnitude and in total creates voltage at the terminals of the relay, at which measles does not disappear.

Claims (1)

Claims A rail circuit comprising a power transformer, one winding terminal of which is connected to one rail string at one end of a rail line through a diode, and a relay transformer, one of the winding. which is connected to rail yarns on the other end of the rail line, and one terminal of its other winding is connected to one capacitor plate, the other facing of which is connected to one terminal of the track relay winding, which is equipped with an additional a relay transformer and an additional diode, through which, connected in the same way as the first, is connected to another rail yarn, another terminal of the winding of the supply transformer, made with an average output, the first winding being additional the output relay transformer is connected in series with the first winding of the first relay transformer and their connection point is connected to the middle winding terminal of the supply transformer, the secondary relay transformer winding is connected in series with the second winding of the first relay transformer and its other output terminal is connected to another winding relay output terminal .