Study of synchronous generator eccentricities using analytical approach and FEM

Iamamura, B. A. T.; Menach, Yvonnick Le; Tounzi, A.; Sadowski, N.; Guillot, E.

doi:10.1109/icelmach.2010.5608249

Cited by 11 publications

(5 citation statements)

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“…If a synchronous machine is operating under eccentric conditions then there is a significant increase in the electromagnetic radial and tangential forces [7]. It was shown [8] that eddy currents are induced in the damping bars even at no-load, due to the variation of the air-gap reluctance in eccentric synchronous generators. A study on the Unbalanced Magnetic Pull (UMP) in eccentric salient-pole generators showed that static and dynamic eccentricities are almost independent [6].…”

Section: Introductionmentioning

confidence: 99%

Off-Line Detection of Static Eccentricity in Salient-Pole Synchronous Machines

Gyftakis

Platero

Bernal

2018

2018 XIII International Conference on Electrical Machines (ICEM)

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Section: Introductionmentioning

confidence: 99%

Off-Line Detection of Static Eccentricity in Salient-Pole Synchronous Machines

Gyftakis

Platero

Bernal

2018

2018 XIII International Conference on Electrical Machines (ICEM)

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“…Some level of inherent eccentricity is expected, however, and this is due to the very small air-gap between the rotor poles and the stator teeth [6]. The impact of the rotor weight affects the level of the static eccentricity in large electrical machines over time.The impact of eccentricity on synchronous machines has been studied in the past [6][7][8][9]. The radial and tangential forces are known to increase in the presence of eccentricity conditions [7].…”

mentioning

confidence: 99%

“…The radial and tangential forces are known to increase in the presence of eccentricity conditions [7]. It has been presented in reference [8] that variation of the air-gap magnetic reluctance will generate eddy currents in the rotor damping cage, even at unloaded operation [8]. A paper on the Unbalanced Magnetic Pull (UMP) caused by eccentricity faults in synchronous machines presented the independence between the static and dynamic eccentricity [6].…”

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confidence: 99%

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Diagnosis of Static Eccentricity in 3-Phase Synchronous Machines using a Pseudo Zero-Sequence Current

et al. 2019

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Large synchronous generators are the heart of the modern world, while producing the vast majority of the electric power consumed globally. Although they are robust devices, they are prone to degradation and failure. If such failures are not detected at an early stage, then the negative impact may be catastrophic in terms of financial costs, repair times, human lives and quality of life. This is the reason for continuous research in the field of condition monitoring aiming towards the reliable operation of synchronous generators. This paper proposes a novel technique for the diagnosis of the static eccentricity in synchronous generators. The proposed approach is off-line and non-intrusive, allowing the estimation of the fault severity with stator current measurements only. The performed work has been carried out with Finite Element Simulations and extensive experimental testing. Energies 2019, 12, 2476 2 of 16where the electrical machine operates under an asymmetrical air-gap due to displacement of the rotor. The eccentricity fault may be either static when the rotor's dislocation is fixed in space and time, or dynamic when the rotor geometric center changes continuously over time. If the two conditions co-exist, then this is known as the mixed eccentricity condition [5].The static eccentricity fault usually appears at the commissioning stages and starts as a manufacturing fault. It can be caused by improper alignment of the shaft or the stator inner ovality. Some level of inherent eccentricity is expected, however, and this is due to the very small air-gap between the rotor poles and the stator teeth [6]. The impact of the rotor weight affects the level of the static eccentricity in large electrical machines over time.The impact of eccentricity on synchronous machines has been studied in the past [6][7][8][9]. The radial and tangential forces are known to increase in the presence of eccentricity conditions [7]. It has been presented in reference [8] that variation of the air-gap magnetic reluctance will generate eddy currents in the rotor damping cage, even at unloaded operation [8]. A paper on the Unbalanced Magnetic Pull (UMP) caused by eccentricity faults in synchronous machines presented the independence between the static and dynamic eccentricity [6]. Finally, it was shown that the impact of the damper cage in case of eccentric conditions is very weak, an attribute associated with its high ohmic resistance [9]. However, the damper cage's impact on the forces due to the eccentricity fault is small, an attribute due to the cage's high ohmic resistance.Moreover, focusing on the actual diagnosis of the eccentricity fault in synchronous machines, it is clear that most past works focus on either permanent magnet [10][11][12][13] or reluctance machines [14-16], while literature is very limited for salient pole ones. Despite this unequal research effort, some contributions have been identified and are listed here. Intrusive techniques such as the installation of flux sensors to capture the air-gap magnetic flux give...

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“…ηηο εξγαζίεο [6], [9], [14] - [17] θαη [19] όιεο νη ζεσξήζεηο γηα ηελ αλάιπζε ηεο ιεηηνπξγίαο ηεο ζύγρξνλεο κεραλήο έρνπλ πξαγκαηνπνηεζεί γηα κεραλέο κε θαηαλεκεκέλν ηύιηγκα, αληίζηνηρα νη [4] θαη [5] αθνξνύλ αζύγρξνλεο κεραλέο, ε εξγαζία [10] αθνξά ζηε ζύγρξνλε γελλήηξηα κε κόληκν καγλήηε. ηηο εξγαζίεο [11] θαη [12] ε ζύγρξνλε γελλήηξηα ιεηηνπξγεί ελ θελώ, ελώ ζηηο [8] θαη [20] έρεη εθαξκνζζεί έλα θνξηίν R-L. Μόλν ε εξγαζία [18] [38] θαη [39].…”

Section: στόχοι της διατριβήςunclassified

Υπολογισμός Ηλεκτρομαγνητικών Μεγεθών Και Πρόβλεψη Συμπεριφοράς Μιας Σύγχρονης Μηχανής Με Έκτυπους Πόλους Σε Περιπτώσεις Σφαλμάτων Με Τη Χρήση Της Μεθόδου Πεπερασμένων Στοιχείων

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Στόχοι διατριβής………………………………………………...... 12 ΚΕΦΑΛΑΙΟ 2 ΔΙΕΡΕΥΝΗΣΗ ΚΑΙ ΑΝΑΛΥΣΗ ΣΦΑΛΜΑΤΩΝ ΣΕ ΣΥΓΧΡΟΝΕΣ ΓΕΝΝΗΤΡΙΕΣ -ΑΝΑΛΥΣΗ ΣΕ ΔΥΟ ΔΙΑΣΤΑΣΕΙΣ ΜΕ ΤΗ ΜΕΘΟΔΟ ΠΕΠΕΡΑΣΜΕΝΩΝ ΣΤΟΙΧΕΙΩΝ……….…………………. 2.1 Σύντομη αναφορά στα συνήθη σφάλματα στις Σύγχρονες Μηχανές………………………………………………………….. 15 2.1.1 Σφάλματα στο δρομέα της Σύγχρονης Μηχανής………………… 2.1.2 Σφάλμα στα τυλίγματα του στάτη της Σύγχρονης Γεννήτριας…... 2.2 Μοντελοποίηση της Σύγχρονης Γεννήτριας έκτυπων πόλων με τη μέθοδο των πεπερασμένων στοιχείων………………………… 22 2.2.1 Το μοντέλο της σύγχρονης γεννήτριας με έκτυπους πόλους……. 2.2.2 Μοντελοποίηση του βραχυκυκλώματος στην τροφοδοσία του τυλίγματος διέγερσης……………………………………………. 2.2.3 Μοντελοποίηση βραχυκυκλώματος σε τμήμα του τυλίγματος του στάτη…………………………………………………………….. 2.2.4 Υπολογισμός των ρευμάτων στα τυλίγματα απόσβεσης ……….. 2.2.5 Παραλληλισμός της σύγχρονης γεννήτριας και έλεγχος στροφών ΚΕΦΑΛΑΙΟ 3 ΥΠΟΛΟΓΙΣΜΟΣ ΚΑΙ ΑΝΑΛΥΣΗ ΗΛΕΚΤΡΟΜΑΓΝΗΤΙΚΩΝ ΜΕΓΕΘΩΝ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΩΝ ΠΕΠΕΡΑΣΜΕΝΩΝ ΣΤΟΙΧΕΙΩΝ………………………………………………………………. 3.1 Περί της μεθόδου των πεπερασμένων στοιχείων (FEM)………… 41 3.1.1 Καθορισμός των περιοχών του μοντέλου ………………………. 3.1.2 Εξισώσεις ηλεκτρομαγνητικού πεδίου …………………….……. 3.1.3 Οριακές συνθήκες ………………………………………………. 3.1.4 Χρήση της μεθόδου των πεπερασμένων στοιχείων……………… ΚΕΦΑΛΑΙΟ 4 ΒΡΑΧΥΚΥΚΛΩΜΑ ΣΤΟ ΤΥΛΙΓΜΑ ΔΙΕΓΕΡΣΗΣ ΜΕ ΣΥΝΔΕΔΕ-ΜΕΝΟ ΤΟ ΣΤΑΤΗ ΣΕ ΙΣΧΥΡΟ ΔΙΚΤΥΟ ΚΑΙ ΣΤΑΘΕΡΟ ΑΡΙΘΜΟ ΣΤΡΟΦΩΝ ΤΟΥ ΔΡΟΜΕΑ …………………………………. 4.1 Προσομοίωση του σφάλματος στο δρομέα……………………… 51 Σχήμα 1.1 a) Δρομέας σύγχρονης μηχανής με κατανεμημένο τύλιγμα. b) Δρομέας σύγχρονης μηχανής με έκτυπους πόλους.

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Study of synchronous generator eccentricities using analytical approach and FEM

Cited by 11 publications

References 11 publications

Off-Line Detection of Static Eccentricity in Salient-Pole Synchronous Machines

Off-Line Detection of Static Eccentricity in Salient-Pole Synchronous Machines

Diagnosis of Static Eccentricity in 3-Phase Synchronous Machines using a Pseudo Zero-Sequence Current

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