Title :
Harmonic Signatures of Static Eccentricities in the Stator Voltages and in the Rotor Current of No-Load Salient-Pole Synchronous Generators
Author :
Bruzzese, Claudio ; Joksimovic, Gojko
Author_Institution :
Dept. of Astronaut., Electr. & Energetic Eng., Univ. of Rome Sapienza, Rome, Italy
fDate :
5/1/2011 12:00:00 AM
Abstract :
This paper shows that a static eccentricity makes rise a double fundamental frequency ripple in the rotor current of salient-pole synchronous machines. This ripple leads, under conditions ruled by the stator windings, to precise signatures in the no-load voltage spectrum. Both rotor current ripple and voltage harmonics can be used for diagnosis. The fault-related voltage harmonics are theoretically previewed in this paper through analysis of the windings. Simulations performed by using the winding function approach confirm the theoretical predictions. A four-pole 15-kVA generator was used for experiments, featuring an innovative flange with exact and easy regulation of mixed-type eccentricities. Rotor current monitoring has advantages of single-sensor measure and accentuate fault sensitivity. Experiments also showed an additional rotor-rotation frequency ripple in the rotor current, in case of mixed-type fault.
Keywords :
fault diagnosis; rotors; stators; synchronous generators; fault-related voltage harmonics; harmonic signatures; no-load salient-pole synchronous generators; rotor current; static eccentricities; stator voltages; Generators; Harmonic analysis; Mathematical model; Rotors; Stator windings; Windings; Fault diagnosis; machine voltage analysis; rotor current analysis; rotor eccentricities; synchronous generator (SG);
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2010.2087296