Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1997-12-12
1999-04-13
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 48, 361115, H02H 300
Patent
active
058943935
ABSTRACT:
A ground fault and over-voltage detector and method is disclosed for sensing a loss of neutral continuity between the respective neutral conductors of a ground power unit and an aircraft power system coupled to the unit. The detector includes a feedback path for carrying a feedback signal from the aircraft to the ground power unit. The feedback signal comprises a voltage signal referenced to the aircraft neutral and includes a ground fault voltage component. The detector further includes a signal conditioner disposed in the ground power unit for receiving the feedback signal and generating a signal representative of the magnitude of the ground fault voltage component. A comparator connected to the output of the signal conditioner contrasts the ground fault voltage magnitude signal to a predetermined threshold and a cutoff mechanism responsive to the comparator, when the ground fault voltage is greater than the threshold, to interrupt ground power from the ground power unit to the aircraft.
REFERENCES:
patent: 4153923 (1979-05-01), Graf
Elliott Stephen H.
Kosciusko Norman
Miller John A.
Gaffin Jeffrey
Jackson Stephen
Trilectron Industies, Inc.
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