Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-08-01
1989-02-28
Brigance, Gerald L.
Communications: electrical
Condition responsive indicating system
Specific condition
340642, G08B 2100
Patent
active
048089826
ABSTRACT:
A facility for monitoring the operation of a signal lamp in the outdoor installation of an interlocking. Such signal lamps are powered through lamp transformers located in the immediate vicinity of the lamps. Monitoring for filament breaks is done on the primary side in the interlocking station. The monitoring poses problems in the case of great control distances because leading reactive currents occur on long leads. The invention uses a modulator in the secondary circuit of the lamp transformer which impresses on the lamp current a unique modulation pattern that is recognized in the interlocking station. In addition, the modulator may be turned on via a photocell responsive to the light of the signal lamp, and may perform additional control functions, such as turning on auxiliary light sources.
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Helmut Scherz, Wuppertal, "Eisenbahntechnische Praxis", 1959, No. 3, pp. 25 and 26.
ALCATEL N.V.
Brigance Gerald L.
Hjerpe Richard
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