METHOD OF OPEN-LINE STATE CONTROL Russian patent published in 2008 - IPC B61L23/16 

FIELD: transport.

SUBSTANCE: AC current signal is fed into the rail circuit at its one end to control the signal variation at its other end, the reference voltage is recorded with the previous railway circuit occupied, the input resistance of the railway circuit one end is assumed to be a complex quantity with a capacitance component. The input resistance of the railway circuit other end is assumed to be a complex quantity with an inductance component. The ends' instruments are interchanged with a preset time interval to effect two corrections of the reference voltage. The reference voltage defining the insulation resistance is taken to determine the occupation threshold voltage, that is, the current voltage at the receiver input with the bridge circuit on the track input end and to determine the clearing threshold voltage, that is, the occupation threshold voltage multiplied by the safety factor. With the current voltage decreasing below the occupation threshold voltage, the track is assumed to be occupied, and with the current voltage exceeding the clearing threshold voltage the tract is considered cleared.

EFFECT: higher reliability of rail state control.

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