Condition monitoring of power transformer on-load tap-changers. Part 1: Automatic condition diagnostics

Kang, Pengju; Birtwhistle, David

doi:10.1049/ip-gtd:20010389

Cited by 55 publications

(32 citation statements)

References 6 publications

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“…Among various techniques for On-Load Tap Changer (OLTC) condition monitoring, vibro-acoustic measurement can be performed online without disturbing OLTC and transformer operation [1][2][3][4][5]. Vibro-acoustic measurement is useful in detecting change in mechanical condition at different stages of an OLTC's service life.…”

Section: Introductionmentioning

confidence: 99%

“…Vibro-acoustic measurement is useful in detecting change in mechanical condition at different stages of an OLTC's service life. Any such changes can be reflected by identifying the transition of the magnitude and time-ofoccurrence of the measured vibro-acoustic signal acquired during OLTC's operation [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…A number of signal processing techniques have been applied for analyzing OLTC's vibro-acoustic signals [1][2][4][5]. Several researchers adopted wavelet transform [1,4].…”

Section: Introductionmentioning

confidence: 99%

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On Savitzky–Golay Filtering for Online Condition Monitoring of Transformer On-Load Tap Changer

Seo

Saha

2018

IEEE Trans. Power Delivery

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Abstract-Vibro-acoustic measurement on a transformer's On-Load Tap Changer (OLTC) can provide indications on its mechanical condition. Recently, a joint vibro-acoustic and arcing measurement system has been proposed, which can correlate the vibro-acoustic signal to mechanical events of OLTC's operation. However, there are still considerable difficulties in extracting useful information from both vibro-acoustic signal and arcing signal in a synchronized manner without any distortions in the extracted signals. In this paper, Savitzky-Golay filter is introduced to process the signals acquired from a joint vibro-acoustic and arcing measurement system installed on in-service OLTCs. It proves that the Savitzky-Golay filter can process both vibroacoustic and arcing signals induced by OLTC, extract essential information without any time delay from both types of signals, and retrieve voltage phase information from the arcing signal. The methodologies developed in this paper can improve the visibility of OLTC's mechanical operation for an effective online condition monitoring.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On Savitzky–Golay Filtering for Online Condition Monitoring of Transformer On-Load Tap Changer

Seo

Saha

2018

IEEE Trans. Power Delivery

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“…Continuous switching operations of OLTC may lead to their degradation mainly due to erosion of contacts and driving mechanism [1,2]. This degradation of the contacts may lead to failure of OLTC components and consequent failure of power transformers.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission signal analysis of On-Load Tap Changer (OLTC)

Shanker

Nagamani

Punekar

2013

2013 IEEE 1st International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

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On-Load Tap Changer (OLTC) forms a vital part of a transformer. Acoustic emission signals have been acquired from OLTC of 230 kV 3 phase power transformers for signature analysis. The acoustic emission signals have been analyzed to characterize the signals with reference to energy and frequency using Discrete Wavelet Transform. Case studies of AE signals obtained from healthy OLTCs have been presented in the paper for probable consideration as reference signals for healthy and normally operating OLTCs.

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“…In operation, the OLTC produces constant switching of its contacts which provokes their degradation [2], [3]. This condition may cause a critical failure in the OLTC and should be avoided by a preventive diagnosis.…”

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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Condition monitoring of power transformer on-load tap-changers. Part 1: Automatic condition diagnostics

Cited by 55 publications

References 6 publications

On Savitzky–Golay Filtering for Online Condition Monitoring of Transformer On-Load Tap Changer

On Savitzky–Golay Filtering for Online Condition Monitoring of Transformer On-Load Tap Changer

Acoustic emission signal analysis of On-Load Tap Changer (OLTC)

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

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