Condition Assessment of Power Transformer on-Load Tap-Changers Using Wavelet Analysis

Kang, Pengju; Birtwhistle, David

doi:10.1109/mper.2001.4311394

Cited by 27 publications

(21 citation statements)

References 3 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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“…In all mentioned studies accelerometer was used to measure signals. Paper [1] presents study aimed to determine technical condition of selector type tap changer based on continuous wavelet transformation. Analysis is based on envelope of acoustic emission signal, and quadratic spline wavelet was used.…”

Section: Introductionmentioning

confidence: 99%

Selecting Mother Wavelet for Wavelet Analysis of On-Load Tap Changer Acoustic Emission

2015

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Wavelet transformation is one of the most popular tools for acoustic signal analysis. It provides good resolution both in time and frequency domains as well as wide choice of mother wavelets this makes wavelet transformation a choice when exible approach is required. However, selecting parameters of analysis can be dicult, especially regarding mother wavelet as dierent mother wavelets have various properties regarding number of vanishing moments and symmetry. This paper presents studies to determine the possibility of on-load tap changer wear detection by applying wavelet transformation. In research, dierent mother wavelets were selected and their usefulness was examined. Signals to be analyzed were obtained during on-load tap changer operation in dierent mechanical conditions simulating devices wear in service. All measurements were performed on model very similar to real industrial on-load tap changer. Tests were conducted in controlled laboratory environment, reducing most of the possible disruptions.

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“…Also, they have tried to develop control algorithms, methods and techniques to make possible the use of transformers with LTC in an automated, efficient and safe way. [4]- [9] …”

Section: Introductionmentioning

confidence: 99%

Remote Control System for Transformer with on-Load Tap Changer

Sagastabeitia¹,

Aginako²,

A³

et al. 2005

REPQJ

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Abstract. This paper presents a Remote Control System forTransformers with On-Load Tap Changer. This tool has been designed to be implemented in Remote Telecontrol Units (RTU) located in Transformation Centers (CT) with on-load tap changing capability. Its final application is to provide an integral solution of the telecontrolled on-load tap changer from a Remote Operation Control Position (ROCP), located into the electric company´s operation office.

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Condition Assessment of Power Transformer on-Load Tap-Changers Using Wavelet Analysis

Cited by 27 publications

References 3 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

Selecting Mother Wavelet for Wavelet Analysis of On-Load Tap Changer Acoustic Emission

Remote Control System for Transformer with on-Load Tap Changer

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