Ronald C Harvey

Address:

3916 Cabildo Pl, Ocean Springs, MS 39564

VIN:

5FNRL38687B108113

Make:

HONDA

Model:

ODYSSEY

Year:

2007

US Patent:

7253633, Aug 7, 2007

Filed:

Aug 5, 2004

Appl. No.:

10/910819

Inventors:

Ronald C. Harvey - Ocean Springs MS, US

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

G01R 31/08
H02H 3/00

US Classification:

324509, 324512, 324521, 324522, 361 42

Abstract:

A polyphase power system with a system safety ground supplies a plurality of power phases over a respective plurality of power lines to power a load. A plurality of phase fault detectors of a fault detection component monitor the plurality of power lines, respectively. A phase fault detector, of the plurality of phase fault detectors, monitors a power line of the plurality of power lines. The phase fault detector outputs a threshold voltage with a voltage divider coupled with the power line. The threshold voltage is a line-to-ground voltage relative to a localized ground. A capacitor coupled between the localized ground and the system safety ground provides a direct current offset to the localized ground upon a ground fault condition. The phase fault detector compares the threshold voltage with a reference voltage to make a determination of an existence of the ground fault condition in the power line.