Railway switches and signals – Block-signal systems – Automatic
Patent
1982-08-02
1985-08-20
Groody, James J.
Railway switches and signals
Block-signal systems
Automatic
246122R, 324 87, B61L 2100, B61L 2500
Patent
active
045359598
ABSTRACT:
This vital solid state relay incorporates only passive elements and is intended for use as a replacement for a two element AC track relay in AC track circuits. The local input signal is applied to a transformer whose secondary output, across a Zener diode, is a pulsed, square wave DC with regulated peak. The track input is applied through a noise rejection filter, tuned to track circuit frequency, to a coupling transformer. A series loop registry circuit includes the secondary of each transformer, a DC relay, and a varistor element. The sum of the transformer output signals, due to the Zener diode rectification, has a DC component. When local and track signals are both present and substantially in phase, the varistor switches to its high current condition to pick up the DC relay to indicate an unoccupied track section. Absence of the track input, out of phase conditions, or unmatched frequencies retains the varistor in its low current state and the DC relay releases to register an occupied section.
REFERENCES:
patent: 4188002 (1980-02-01), Gilcher
patent: 4258312 (1981-03-01), Gilcher
patent: 4298179 (1981-11-01), Gilcher
patent: 4407470 (1983-10-01), Gilcher
American Standard Inc.
Groody James J.
Williamson, Jr. A. G.
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