TRACK CIRCUIT Russian patent published in 2008 - IPC B61L23/16 

FIELD: automation.

SUBSTANCE: invention concerns railway automation and can be applied in the systems of interval regulation of underground trains. The track circuit consists of a rail way, two track transformers, power generator and a receiver. One end of the rail way is linked to the secondary coil of the transformer, the primary coil of which is connected to the power generator with functional superimposing of automated locomotive signalling coding, and the other end is linked to the secondary coil of the second track transformer, the primary coil of which is connected to the track receiver with functional superimposing of automated locomotive signalling coding. Capacitors are connected in series to the secondary coils of track transformers. Values of capacitors satisfy the conditions of voltage resonance in the track circuit at the carrier frequency of track control signal in normal mode and of inverse resonance at the carrier frequency of automated locomotive signalling.

EFFECT: significant decrease of effect of traction current asymmetry; improved noise immunity and reliability of track circuit operation.

3 dwg