Diagnosis of faults in induction generators under fluctuating load conditions through the instantaneous frequency of the fault components

Vedreno-Santos, F.; Riera-Guasp, M.; Henao, H.; Pineda-Sánchez, Manuel

doi:10.1109/icelmach.2012.6350102

Cited by 10 publications

(23 citation statements)

References 21 publications

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“…pose new problems which require original approaches [3]- [7]. Methods applicable in transient [4], [8] and unbalanced load [9] operating conditions are demanded. Also, improved methods for fault diagnosis of round-rotor or salient-pole wound-field machines used in classical plants are intensively investigated since the life expectancy of large machines in aged plants could be extended beyond the design limits [10]- [13], as in case of turbogenerators used in nuclear plants [14].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…This paper addresses the problem of improving the fault diagnostic reliability of induction machines working under non-stationary conditions and in generator mode, improving the work done in [24] where the method was presented. In this paper, a deeper explanation of the methodology is presented as well as compressive comments of practical application issues of the approach and also, new validations by test, carried out on a different machine.…”

Section: Index Terms--mentioning

confidence: 99%

Diagnosis of Rotor and Stator Asymmetries in Wound-Rotor Induction Machines Under Nonstationary Operation Through the Instantaneous Frequency

Vedreno-Santos

Riera-Guasp

Capolino

et al. 2014

IEEE Trans. Ind. Electron.

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“…For such applications, conventional diagnostic methodologies based on steady-state analysis -as MCSA-usually lead to unsatisfactory results [1]. As a consequence, new diagnostic approaches focused on non-steady state operation have recently been proposed, based on the application of different kind of signal analysis tools as Continuous Time-Frequency representations (such as Wigner Ville Distribution [3]- [5], Short-Time Fourier Transform [6], Continuous Wavelet Transform [7]) or Discrete Time Frequency transforms (as the Discrete Wavelet Transform [8]- [12]). …”

mentioning

confidence: 99%

“…Until now, most of the non-stationary diagnostic methods described in the literature as [8]- [12] use the DWT as a filtering tool for extracting the fault components. The worldwide use of the DWT comes from its easiness to be set and its efficiency when performing a filtering process with a reasonable computational cost.…”

mentioning

confidence: 99%

“…In [8] the authors introduce an adaptive algorithm which extracts the fundamental current component from transient waves and then it is analyzed the residual by using the DWT, then rotor faults are diagnosed through the increase in some wavelet coefficients. Papers [9]- [12] deal with the diagnosis of stator and rotor faults in Wound Rotor Induction Machines (WRIG) under non stationary operation. In [9] an approach for detecting stator and rotor asymmetries in WRIG, valid under load transient conditions, is presented.…”

mentioning

confidence: 99%

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Diagnosis of induction machines under non-stationary conditions by means of the spectral filter

Vedreno-Santos

Riera-Guasp

Pineda-Senchez

2013

2013 9th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED)

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Φ Abstract --This paper introduces a new way to extract the fault components of a signal by means of a new proposed filter based on the Sampling Theorem and the properties of Discrete Fourier Transform. The proposed method is able to extract fault components either in steady-state or in transient conditions. This paper also proposes a new way to compute the energy of a signal in the frequency domain by means of the Plancherel's Theorem. Unlike the Discrete Wavelet Transform, which makes the filtering process in the time domain, the Discrete Fourier Transform allows the filtering process in the frequency domain. The use of the Discrete Fourier Transform makes the filtering process possible without applying any pretreatment to the current as it is done in the former works. As a consequence of the filtering process in the frequency domain and in order to reduce useless computations, in the current paper is also demonstrated the possibility of the computation of the energy of the extracted fault component in the frequency domain. The results are compared with the former and already published works in the area showing the good reliability of the new filtering process and energy computation in the frequency domain.

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Diagnosis of faults in induction generators under fluctuating load conditions through the instantaneous frequency of the fault components

Cited by 10 publications

References 21 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 Rotor and Stator Asymmetries in Wound-Rotor Induction Machines Under Nonstationary Operation Through the Instantaneous Frequency

Diagnosis of induction machines under non-stationary conditions by means of the spectral filter

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