Electrical protective circuits

Details Electrical protective circuits Electrical protective circuits

1974-10-07

1976-05-11

Blix, Trygve M.

Railway switches and signals

Block-signal systems

Automatic

246 40, B61L 2316

Patent

active

039557855

ABSTRACT:
A detective circuit for railway points composed of three track sections connected together at a junction or for a railway crossing composed of four track sections connected together at a junction. The detective circuit comprises an ac generator adapted to supply energy at a selected frequency across the junction of the points or crossing, a first capacitor connected across the junction to form a resonant circuit at the aforementioned frequency with the inductance of the lengths of track between the junction and the intersection or intersections of the tracks, a low impedance, frequency selective link connected across the tracks of each section of the points or crossing, each link comprising a second capacitor forming a tuned circuit at the aforementioned frequency with the inductance of an inductor connected in series therewith, and a device for monitoring the current or voltage in each link, the current or voltage in each link in the converging track sections of the points or crossing appearing as result of the voltage arising in the aforementioned lengths of track during use of the detective circuit.

REFERENCES:
patent: 2993116 (1961-07-01), Utt
patent: 3683176 (1972-08-01), Crofts

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