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TIME-STEPPING FINITE-ELEMENT ANALYSIS OF DY- NAMIC ECCENTRICITY FAULT IN A THREE-PHASE SALIENT POLE SYNCHRONOUS GENERATOR

By J. Faiz, M. Babaei, J. Nazarzadeh, B. M. Ebrahimi and S. Amini

Abstract

Abstract—In this paper, two-dimensional time-stepping finiteelement (TSFE) method is performed for modeling and analyzing of a salient pole synchronous generator with different degree of dynamic eccentricity (DE) fault. TSFE analysis is used to describe the influence of DE fault on the flux distribution within the generator and no-load voltage profiles at low and high field current is obtained for healthy and faulty cases. Comparing the magnetic flux distribution of healthy and faulty generators helps to detect the influence of DE fault. Also, it can be seen at no-load condition with low excitation current, the effect of the eccentricity is considerable compared to that of the rated excitation current. Since the calculation of inductances of the machine is the most Corresponding author: M. Babaei (mba babaei@yahoo.com).264 Faiz et al. important step for fault analysis and diagnosis, the self- and mutualinductances of the stator phases and rotor windings are calculated in the eccentric generator. Double periodic phenomenon is observed in inductances profile of stator phases due to the DE fault. Finally, spectrum analysis of stator current of two generators with different design parameters is used to diagnosis the significant harmonics in the presence of DE fault. 1

Year: 2014
OAI identifier: oai:CiteSeerX.psu:10.1.1.413.6638
Provided by: CiteSeerX
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