Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2005-06-28
2005-06-28
Karlsen, Ernest (Department: 2829)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C340S648000
Reexamination Certificate
active
06911838
ABSTRACT:
A method for detecting a shorted turn in a synchronous machine having a rotor using a magnetic flux probe is disclose having the steps of: monitoring a signal from the flux probe during on-line operation of the machine; integrating the flux probe signal to generate a flux density data trace that repeats during each rotor revolution; upon detecting movement in the flux density zero-crossing, capturing the flux probe signal for a current rotor revolution for a variety of machine load conditions, and performing a shorted turn analysis with the captured flux signal data.
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patent: 4377784 (1983-03-01), Saito et al.
patent: 4667148 (1987-05-01), Albright et al.
patent: 4851766 (1989-07-01), Shiobara et al.
patent: 5252915 (1993-10-01), Sedding et al.
“Interturn Short-Circuit Detector For Turbine-Generator Rotor Windings”, D.R. Albright, pp. 3-11, (Jul., 1970).
“Detection of Shorted Turns in Generator Field Windings”, GE Energy Services, pp. 1-2, (Feb., 2002).
“Generator Field Winding Shorted Turn Detector (Flux Probe)”, GE Installation and Service EngineeringSteam Turbine, pp. 1-21, Nov., 1991.
Goodrich Gregory John
Rao Kotesh Kummamuri
General Electric Company
Karlsen Ernest
Nixon & Vanderhye P.C.
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