Study of synchronous generator static eccentricities &amp;#x2014; FEM results and measurements

Iamamura, B. A. T.; Menach, Yvonnick Le; Tounzi, A.; Sadowski, N.; Guillot, E.; Jacq, Thierry; Langlet, J.

doi:10.1109/icelmach.2012.6350130

Cited by 10 publications

(8 citation statements)

References 11 publications

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“…RE monitoring through air-gap flux density sensing is reported in [14], [15], and [18]. Simond et al [15] used search coils wrapped around the stator yoke and with a side immersed in the air-gap field.…”

Section: Air-gap Flux Density Signature Analysismentioning

confidence: 99%

“…The method is practical only for very large machines. Biet [14] and Iamamura et al [18] instead used two coils wrapped on the tooth tips and displaced by 180 electrical degrees. The voltage signals are integrated and subtracted to obtain fault signatures.…”

Section: Air-gap Flux Density Signature Analysismentioning

confidence: 99%

“…However, superior-order REs (ovalized stator and deformed rotor) may produce signature aliasing if only few coils are used [9]. The results are highly load dependent, and the quantitative fault assessment is problematic [18]. Common drawbacks of all these methods are high invasivity and difficulty in fixing the search coils in the air gap.…”

Section: Air-gap Flux Density Signature Analysismentioning

confidence: 99%

“…Common drawbacks of all these methods are high invasivity and difficulty in fixing the search coils in the air gap. The sensors must withstand high temperatures [18] and vibrations [10], which may produce sensor failure or detachment. Moreover, the damping effect of both cage and parallel paths in the stator is neglected.…”

Section: Air-gap Flux Density Signature Analysismentioning

confidence: 99%

“…The turbogenerators instead are high-speed machines with long rotors usually reaching high temperatures [18]. Despite higher specific air gaps, the mechanical, thermal, and electromagnetic stresses are also higher and lead to troubles on the long run.…”

Section: Introductionmentioning

confidence: 99%

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Diagnosis of Eccentric Rotor in Synchronous Machines by Analysis of Split-Phase Currents—Part II: Experimental Analysis

Bruzzese

2014

IEEE Trans. Ind. Electron.

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The windings of power synchronous machines are often parallel connected to obtain the desired machine voltage and current ratings. Ideally, the split-phase currents are equal in symmetrical windings, so as to avoid parasitic circulation of current in the parallel branches. However, the symmetry is broken in case of rotor eccentricity, and the split-phase currents become unbalanced. Part I of this paper analyzed the theoretical behavior of the unbalanced currents by using symmetrical components. A new fault diagnosis method was shown, based on a combined space-vector/fast Fourier transformation (FFT) analysis of signatures in the split-phase currents. This Part II applies the split-phase current signature analysis to a laboratory 17-kVA synchronous generator with artificial faults. Method performances have been evaluated with mixed static/dynamic type fault, in no-load and loaded conditions. The experiments are matched with time-stepping finite-element simulations, which help explain the effect of saturation and load on the diagnosis accuracy. The feasibility of installation of current probes in practical machines is also discussed.

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Section: Air-gap Flux Density Signature Analysismentioning

confidence: 99%

Section: Air-gap Flux Density Signature Analysismentioning

confidence: 99%

Section: Air-gap Flux Density Signature Analysismentioning

confidence: 99%

Section: Air-gap Flux Density Signature Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Diagnosis of Eccentric Rotor in Synchronous Machines by Analysis of Split-Phase Currents—Part II: Experimental Analysis

Bruzzese

2014

IEEE Trans. Ind. Electron.

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Diagnosis of the combined rotor faults using air gap magnetic flux density spectrum for an induction machine

Seghiour

Seghier

Zegnini

et al. 2017

Int J Syst Assur Eng Manag

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Static and dynamic eccentricity fault diagnosis of large salient pole synchronous generators by means of external magnetic field

Ehya

Nysveen

Nilssen

et al. 2021

IET Electric Power Appl

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Although synchronous generators are robust and long-lasting equipment of power plants, consistent electricity production depends on their health conditions. Static and dynamic eccentricity faults are among the prevalent faults that may have a costly effect. Although several methods have been proposed in the literature to detect static and dynamic eccentricity faults in salient pole synchronous generators (SPSGs), they are non-sensitive to a low degree of failure and require a predefined threshold to recognise the fault occurrence that may vary based on machine configuration. This article presents a detailed magnetic analysis of the SPSGs with static and dynamic eccentricity faults by focusing on the external magnetic field. The external magnetic field was measured using two search coils installed on the backside of the stator yoke. Also, advanced signal processing tools based on wavelet entropy were used to analyse the induced electromotive force (emf) in search coils to extract the fault index. The proposed index required no threshold to recognise the starting point of fault occurrence and was sensitive to a low degree of fault. It was also non-sensitive to load variation and noise that may induce a false alarm. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Study of synchronous generator static eccentricities — FEM results and measurements

Cited by 10 publications

References 11 publications

Diagnosis of Eccentric Rotor in Synchronous Machines by Analysis of Split-Phase Currents—Part II: Experimental Analysis

Diagnosis of Eccentric Rotor in Synchronous Machines by Analysis of Split-Phase Currents—Part II: Experimental Analysis

Diagnosis of the combined rotor faults using air gap magnetic flux density spectrum for an induction machine

Static and dynamic eccentricity fault diagnosis of large salient pole synchronous generators by means of external magnetic field

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