Monitoring and warning system for series-fed runway visual aids

Details Monitoring and warning system for series-fed runway visual aids Monitoring and warning system for series-fed runway visual aids

1988-07-18

1990-07-03

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340524, 340525, 340635, 34082511, G08B 2400, G08B 2500

Patent

active

049395050

ABSTRACT:
A system for failure detection of series-fed lighting circuits monitors the status of series-fed lamps and provides for feedthrough shift circuit protection of the isolating transformer and for suppression of overvoltage which appears at the failed lamp terminals. Current monitoring systems are rendered obsolete by this RLW (Runway Lighting Warning). The RLW system, which consists basically of a control unit equipped with detector probes, utilizes the series-fed lamp supply line, without any need for supplementary lines, and displays the failed lamp identification number accurately. The system has its preferred application in series-fed support lighting systems, but may also find application within any series-fed lighting system such as that of harbors, road networks and so on. A control unit remote from the detectors counts pulses derived from the periodic supply voltage to identify the detector transmitting the warning signal and the detector is provided with scalers and a programmer for transmitting the warning signal when its count matches the assigned count at the control unit.

REFERENCES:
patent: 4675574 (1987-06-01), Delflache
patent: 4727449 (1988-02-01), Fleck
patent: 4808982 (1989-02-01), Knapp

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