B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
342/17, 346/55
B61L 7/10 (2006.01)
Patent
CA 1279390
72430-98 ABSTRACT Facility for Monitoring the Operation of a Signal Lamp A facility is disclosed for monitoring the operation of a signal lamp in the outdoor installation of an interlocking station. 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.
515178
Knapp Hans J.
Smart & Biggar
Standard Elektrik Lorenz Aktiengesellschaft
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