Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2005-04-19
2005-04-19
Zarneke, David (Department: 2829)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S546000
Reexamination Certificate
active
06882173
ABSTRACT:
Methods and systems consistent with the present invention provide improved online detection of one or more shorts in rotor turns (18) of a field winding (22) of an electric generator. An initial reference inductance LREFis determined by an impedance-measuring circuit (50). A subsequent inductance L is determined by the impedance measuring circuit (50). A data processing system (54) compares LREFto L to determine whether they differ by a predetermined amount. If LREFand L differ by the predetermined amount, an alarm is provided to operators to indicate the presence of one or more shorted rotor turns.
REFERENCES:
patent: 1432003 (1922-10-01), West
patent: 3932811 (1976-01-01), Branch
patent: 4442393 (1984-04-01), Abbondanti
Cates Stephen W.
Nelson Robert John
Nieves Abraham
Prole Aleksandar
Kobert Russell M.
Siemens Westinghouse Power Corporation
Zarneke David
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