On-line testing of on-load tap changers with a portable acoustic system

Foata, M.; Beauchemin, R.; Rajotte, C.

doi:10.1109/tdcllm.2000.882835

Cited by 14 publications

(10 citation statements)

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“…The most common operational problems connected with OLTC may be presented as follows: wear or damage of the main contacts, wear of the resistance contacts, break or improper pull of the power springs, defects of the power transmission system (clearance on transmissions, the Cardan joints etc.) [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it becomes necessary to look for new diagnostic methods for the on-line assessment of the OLTC operation condition, e.g. without shutting-down the transformer under study [1,3,7]. * corresponding author; e-mail: a.cichon@po.opole.pl A method which makes online diagnosis of devices possible is the acoustic method; it is applied for technical condition evaluation of power transformer windings insulation with regard to partial discharges appearance.…”

Section: Introductionmentioning

confidence: 99%

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Characteristic of Acoustic Signals Generated by Operation of On Load Tap Changers

2011

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Possibilities of application of the acoustic method for the on load tab changers diagnosis has been presented in the paper. The analysis of measurement results gathered during research works performed under laboratory conditions has been presented in detail. The registered acoustic signals have been analyzed in time and time-frequency domains. The time domain analysis has been performed by presentation of time runs and their envelopes determined by use of the Hilbert transform. Evaluation of the time-frequency components has been performed by use of the short-time Fourier transform, the discrete and the continuous wavelet transforms.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristic of Acoustic Signals Generated by Operation of On Load Tap Changers

2011

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“…When compared with other OLTC vibration monitoring methods, the proposed technique needs only the initial interval of the signal (interval a), reducing the computational time, and simplifying the classifier system, that will not process the sinal envelope, as proposed on [6], [1], [4] and [5], but only the 9 parameters obtained for the a interval.…”

Section: E Analysis Of the Experimental Resultsmentioning

confidence: 99%

“…On this approach, the vibration signals emitted during the tap changes are recorded and post-processed using spectral analysis and some pattern classifier technique. Some existing works use Wavelet transform [4], [5], [1], or Hilbert convolution [6] for the signal envelope detection, and a neural network to classify the OLTC condition. This paper describes a new method of analysis for the vibration signals, using a Genetic Algorithm as a function estimator.…”

Section: Introductionmentioning

confidence: 99%

Vibration Monitoring of On-Load Tap Changers Using a Genetic Algorithm

Simas

Almeida

Lima

2005 IEEE Instrumentationand Measurement Technology Conference Proceedings

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On Load Tap Changers (OLTC) are widely used for voltage regulation in electricity networks. Non-invasive vibration methods for condition monitoring of internal electrical contacts have been recently proposed in the literature. The vibration signals emitted during the tap changes are usually recorded and post-processed using spectral analysis and some pattern classi er technique. To reduce the complexity of the classi er, a new technique based on Genetic Algorithm is proposed in this paper. A description of the data acquisition system and the corresponding collected experimental data are presented. The proposed technique is detailed and preliminary experimental results are discussed.

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“…The dissolved gas-in-oil analysis (DGA) is the most popular technique for on-line OLTC diagnosis [4]. However, in recent years, many researchers [1], [5], [6], have been investigating non-invasive monitoring and analysis of these devices based on vibration signal analysis techniques, which can avoid unnecessary and inconvenient opening of tap changers. The holler contacts can take up only one fixed contact or two adjacent fixed contacts.…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Condition Assessment of On-Load Tap-Changers using DiscreteWavelet Transform

Almeida

Fontana

Wegelin

et al.

2005 IEEE Instrumentationand Measurement Technology Conference Proceedings

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On-load tap changers (OLTCs) are electromechanical devices used in the voltage regulation of the electrical networks. A non-invasive monitoring method was developed using discrete wavelet transform (DWT) for condition assessment of on-load tap-changers using vibration analysis signals. The transient vibration signals emitted during a tap change are recorded and processed using spectral analysis and standards recognition techniques. The monitoring systems which detect failure during the OLTC operation are quite complexes. In order to reduce this complexity, in this work we demonstrated a new approach based on DWT analysis. The proposed technique is presented and the experimental results as well as its simulation are discussed. Abstract 653 0-7803-8879

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On-line testing of on-load tap changers with a portable acoustic system

Cited by 14 publications

References 0 publications

Characteristic of Acoustic Signals Generated by Operation of On Load Tap Changers

Characteristic of Acoustic Signals Generated by Operation of On Load Tap Changers

Vibration Monitoring of On-Load Tap Changers Using a Genetic Algorithm

A New Approach for Condition Assessment of On-Load Tap-Changers using DiscreteWavelet Transform

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