Generator protection methods and systems self-tuning to a...

Details Generator protection methods and systems self-tuning to a... Generator protection methods and systems self-tuning to a...

2007-08-07

2007-08-07

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

C324S701000, C324S509000, C324S623000, C361S020000

Reexamination Certificate

active

11395568

ABSTRACT:
A method for detecting stator ground faults in a generator is described. The method includes receiving a neutral voltage signal from a neutral point of a stator, receiving a plurality of terminal voltage and current signals from the stator, deriving a magnitude of a harmonic component from the neutral voltage signal, deriving a total complex power from the terminal voltage and current signals, calculating an expected value of a harmonic based on the complex power at a first time and a plurality of values of the complex power, where the values of the complex power are measured at times before the first time, and comparing the expected value and a measured value of the harmonic.

REFERENCES:
patent: 5252915 (1993-10-01), Sedding et al.
patent: 5602709 (1997-02-01), Al-Dabbagh
patent: 5764462 (1998-06-01), Tanaka et al.
patent: 6654216 (2003-11-01), Horvath et al.
patent: 6940702 (2005-09-01), Kojovic et al.
patent: 2004/0264079 (2004-12-01), Lindahl et al.

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