Monofractal and Multifractal Analysis of Discharge Signals in Transformer Pressboards

Pressboards are commonly used as insulating materials employed in electrical connections of transformers. Pressboards are typically made from vegetable fibers, which contain cellulose. The proper operation of power transformer depends mainly on constant monitoring of insulation materials against f...

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Main Authors: CEKLI, S., UZUNOGLU, C. P., UGUR, M.
Format: Article
Language:English
Published: Stefan cel Mare University of Suceava 2018-05-01
Series:Advances in Electrical and Computer Engineering
Subjects:
Online Access:http://dx.doi.org/10.4316/AECE.2018.02009
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author CEKLI, S.
UZUNOGLU, C. P.
UGUR, M.
author_facet CEKLI, S.
UZUNOGLU, C. P.
UGUR, M.
author_sort CEKLI, S.
collection DOAJ
description Pressboards are commonly used as insulating materials employed in electrical connections of transformers. Pressboards are typically made from vegetable fibers, which contain cellulose. The proper operation of power transformer depends mainly on constant monitoring of insulation materials against failure. Due to the complex and close structure of power transformers, it is very challenging task to detect failure and hence possible location of degradation of pressboard internally. Generated discharge signals may result in breakdown of system insulation and system failure. In this study, the investigation of insulation degradation is fulfilled by analyzing discharge signals and simultaneously produced acoustic signals during discharges. For this purpose, a test setup is used for investigating discharge signals of pressboard samples under different electrical stresses. This paper proposes monofractal and multifractal analysis of discharge and acoustic signals of pressboards. The Higuchi’s method is an effective monofractal analysis tool for measurement of fractal dimension of self-affine signals, which is proposed for online monitoring of discharge signals of pressboards. In order to investigate obtained discharge signals with accelerated fluctuations effectively, multifractal detrended fluctuation analysis is proposed for these signals, which exhibit nonlinear behavior.
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spelling doaj.art-3dcd03bbbbbc42b08127efa9bc16cef42022-12-21T18:24:26ZengStefan cel Mare University of SuceavaAdvances in Electrical and Computer Engineering1582-74451844-76002018-05-01182697610.4316/AECE.2018.02009Monofractal and Multifractal Analysis of Discharge Signals in Transformer PressboardsCEKLI, S.UZUNOGLU, C. P.UGUR, M.Pressboards are commonly used as insulating materials employed in electrical connections of transformers. Pressboards are typically made from vegetable fibers, which contain cellulose. The proper operation of power transformer depends mainly on constant monitoring of insulation materials against failure. Due to the complex and close structure of power transformers, it is very challenging task to detect failure and hence possible location of degradation of pressboard internally. Generated discharge signals may result in breakdown of system insulation and system failure. In this study, the investigation of insulation degradation is fulfilled by analyzing discharge signals and simultaneously produced acoustic signals during discharges. For this purpose, a test setup is used for investigating discharge signals of pressboard samples under different electrical stresses. This paper proposes monofractal and multifractal analysis of discharge and acoustic signals of pressboards. The Higuchi’s method is an effective monofractal analysis tool for measurement of fractal dimension of self-affine signals, which is proposed for online monitoring of discharge signals of pressboards. In order to investigate obtained discharge signals with accelerated fluctuations effectively, multifractal detrended fluctuation analysis is proposed for these signals, which exhibit nonlinear behavior.http://dx.doi.org/10.4316/AECE.2018.02009partial dischargespower transformersfractalsacoustic sensorspower quality
spellingShingle CEKLI, S.
UZUNOGLU, C. P.
UGUR, M.
Monofractal and Multifractal Analysis of Discharge Signals in Transformer Pressboards
Advances in Electrical and Computer Engineering
partial discharges
power transformers
fractals
acoustic sensors
power quality
title Monofractal and Multifractal Analysis of Discharge Signals in Transformer Pressboards
title_full Monofractal and Multifractal Analysis of Discharge Signals in Transformer Pressboards
title_fullStr Monofractal and Multifractal Analysis of Discharge Signals in Transformer Pressboards
title_full_unstemmed Monofractal and Multifractal Analysis of Discharge Signals in Transformer Pressboards
title_short Monofractal and Multifractal Analysis of Discharge Signals in Transformer Pressboards
title_sort monofractal and multifractal analysis of discharge signals in transformer pressboards
topic partial discharges
power transformers
fractals
acoustic sensors
power quality
url http://dx.doi.org/10.4316/AECE.2018.02009
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