Device for the protection of track relays from electrical...

Details Device for the protection of track relays from electrical... Device for the protection of track relays from electrical...

B - Operations, Transporting

61

L

346/52

B61L 11/08 (2006.01) B61L 1/18 (2006.01) B61L 23/16 (2006.01)

Patent

CA 2000250

- 16 - ABSTRACT The invention refers to a device for protecting track relays from electrical distrubances originating from the traction current, of the type having: - a control signal generator; - a receiver for said signal; - a signal inverter, to invert periodically the polarity of the signal emitted. According to the invention, means are provided down- stream from said receiver for assessing the frequencies forming the receive signal and which switch the track relay to the "line clear" position only after recogni- tion of the frequencies forming the periodically in- verted control signal (figure 1).

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