Ground fault detector and associated logic for an electronic bal

Details Ground fault detector and associated logic for an electronic bal Ground fault detector and associated logic for an electronic bal

1992-08-24

1994-08-02

Pascal, Robert J.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

315127, 315225, 315292, 315313, 315316, H05B 3700

Patent

active

053349121

ABSTRACT:
An embodiment of the present invention is a lighting system including a sense transformer with two primaries and a secondary for receiving alternating current (AC) from a power source, a low ohmage resistor placed across the sense transformer secondary winding for preventing saturation of the core of the sense transformer, an analog comparator for detecting when ground-fault signals in the sense transformer secondary winding exceed a threshold voltage and digital counters for testing whether or not a ground-fault condition persists longer than three consecutive half-cycles of the received alternating current from the power source.

REFERENCES:
patent: 4954960 (1990-09-01), Lo et al.
patent: 5065074 (1991-11-01), Hesketh et al.

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