TRACK CIRCUIT Russian patent published in 2006 - IPC B61L23/16 

FIELD: railway transport; signaling and communication.

SUBSTANCE: proposed track circuit contains rail line at one side of which matching device of supply end and ac track supply source are connected and at other side, matching device of relay end, phases-sensitive track receiver and local ac supply source are connected. Track circuit is furnished with two code combination shapers using pulse phase sign, input and output of one of shapers being connected, respectively, to output of ac track supply source and input of matching device of supply end, and input and output of other shaper being connected, respectively, to output of local ac supply source and input of local element of phase-sensitive track receiver.

EFFECT: improved safety of traffic owing to prevention of false operation of phase-sensitive track receiver caused by continuous interference of current whose frequency coincides with frequency of track and local supply sources when track circuit is occupied by train or damaged.

2 dwg