Mixed Eccentricity Fault Diagnosis in Salient-Pole Synchronous Generator Using Modified Winding Function Method

Faiz, Jawad; Ebrahimi, Bashir Mahdi; Valavi, Mostafa; Toliyat, H.A.

doi:10.2528/pierb08110903

Cited by 27 publications

(24 citation statements)

References 24 publications

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“…This method has been applied to analyze static, dynamic and mixed eccentricity in induction and synchronous machines [7][8][9][10][11][12]. In [13], different geometrical models for the calculation of inductances of induction machines were evaluated, and the best approximation was recommended.…”

Section: Introductionmentioning

confidence: 99%

A Modified Model of Squirrel Cage Induction Machine Under General Rotor Misalignment Fault

Akbari¹

2013

PIER B

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Abstract-A great deal of researches have so far been conducted on the analysis of eccentricity in induction machines. However, they mostly consider radial non-uniformity and neglect non-uniformity in the axial direction, but in practice, the axial non-uniformity due to rotor misalignment faults is quite common. This paper presents a modified model of a three-phase squirrel cage induction machine under different rotor misalignment conditions. For this purpose, general expressions for air gap and mean radius of induction machine, considering axial non-uniformity, have been developed. The proposed model is able to calculate the time varying inductances versus rotor angle for three-phase squirrel cage induction machines under general rotor misalignment, including static, dynamic and mixed rotor misalignment in the frame of a single program. Simulation results were verified by the experimental ones.

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Section: Introductionmentioning

confidence: 99%

A Modified Model of Squirrel Cage Induction Machine Under General Rotor Misalignment Fault

Akbari¹

2013

PIER B

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“…R OTOR-stator eccentricity in electrical machines is an issue that has caught attention for a long time [1], [2] and is an important item in condition monitoring [3] in electrical machines. Though many papers in the literature [4]- [8] have addressed the issue of eccentricity in rotating electrical machines, and other papers [9]- [12] have dealt with mixed eccentricities (where both static and dynamic eccentricities occur) motion, there has been generally a lack of papers that account for the effect of whirling of the rotor. Two publications that have considered whirling are [13], [14].…”

Section: -O Aidanpäämentioning

confidence: 99%

Estimating forces in mixed eccentricities motion from purely dynamic eccentric rotor centre motion in a hydropower generator and their validation against EM simulations

Calleecharan¹,

Jauregui²,

Aidanpää³

2015

Balkan Journal of Electrical and Computer Engineering

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Abstract-Electromagnetic analysis of hydropower generators is common practice but there is little emphasis on studying the effect of rotor whirling in the analysis. This paper demonstrates the use of the unbalanced magnetic pull (UMP) curves based on purely dynamic eccentricity motion for a wide range of whirling frequencies in the prediction of the steady state UMP in the case of mixed eccentricities motion. The latter motion type is more realistic in practice. Actual electromagnetic (EM) simulations are also carried out for these mixed eccentricities motion cases in order to verify the proposed method. Good agreement between the UMP from the actual EM simulations and the UMP predictions are made when low eccentricities exist. The proposed method is thus very useful since firstly, very few EM software packages can handle mixed eccentricities motion and secondly, since actual EM simulations of intricate rotor centre motion are time-consuming, the proposed method is a big time saver. A modified feature selective validation (FSV) method, the FSV-UPC, is also applied to assess the similarities and the differences in the force computations.Index Terms-eccentricity, electromagnetic simulations, hydropower, rotor, whirl

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“…It can be seen that the 19th harmonic is significant and increased about 6 dB due to the 50% DE. Finally, another generator with specific parameters design has been selected for test in [1,7,27]. Experimental results have been shown that the 17th and 19th harmonics of stator current arise with rise in eccentricity degree and can be utilized as a index for DE fault diagnosis in salient pole synchronous generator.…”

Section: Spectrum Analysis Of the Stator Current At Full-loadmentioning

confidence: 99%

Time-Stepping Finite-Element Analysis of Dynamic Eccentricity Fault in a Three-Phase Salient Pole Synchronous Generator

Faiz¹,

Babaei²,

Nazarzadeh³

et al. 2010

PIER B

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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 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.

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Mixed Eccentricity Fault Diagnosis in Salient-Pole Synchronous Generator Using Modified Winding Function Method

Cited by 27 publications

References 24 publications

A Modified Model of Squirrel Cage Induction Machine Under General Rotor Misalignment Fault

A Modified Model of Squirrel Cage Induction Machine Under General Rotor Misalignment Fault

Estimating forces in mixed eccentricities motion from purely dynamic eccentric rotor centre motion in a hydropower generator and their validation against EM simulations

Time-Stepping Finite-Element Analysis of Dynamic Eccentricity Fault in a Three-Phase Salient Pole Synchronous Generator

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