Threshold adjustment accuracy for ground fault condition...

Details Threshold adjustment accuracy for ground fault condition... Threshold adjustment accuracy for ground fault condition...

2007-08-07

2007-08-07

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

C324S512000, C324S521000, C324S522000, C361S042000

Reexamination Certificate

active

10910819

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.

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