Device for the protection of track relays from electrical distur

Railway switches and signals – Block-signal systems – Automatic

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246 34R, B61L 2108

Patent

active

050944134

ABSTRACT:
A device for protecting track relays from electrical disturbances originating from a train's traction current. The device has: a control signal generator; a signal inverter, to invert periodically the polarity of the signal emitted; and a receiver for the control signal. A distinguishing circuit is provided downstream from the receiver for assessing the frequencies forming the receive signal and switching the track relay to the "line clear" position only after recognition of the frequencies forming the periodically inverted control signal.

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