Investigation on the transformation of time domain spectroscopy data to frequency domain data for impregnated pressboard to reduce measurement time

Shayegani, A. A.; Gockenbach, E.; Borsi, H.; Mohseni, Hossein

doi:10.1007/s00202-005-0316-0

Cited by 21 publications

(16 citation statements)

References 18 publications

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“…Another important aspect, reported by many researchers is the influence of several factors, including temperature, rain and electromagnetic disturbances together with transformer's volume/geometry on the FDS measurements [9,19,51,[114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130]. Producing a FDS measure for insulation which does not require volume/geometry might therefore be very helpful.…”

Section: Frequency Domain Spectroscopymentioning

confidence: 99%

“…A brief comparison between Time Domain Method (TDM) and FDS techniques reveals that FDS has better noise performance and separates the behaviour of polarizability (χ"(ω)) and losses (χ'(ω)) of a dielectric medium, while the dielectric response of an insulating system can be measured with the PDC method in shorter times and with a good accuracy [127]. All these methods appear to have their own strengths and weaknesses.…”

Section: Pdc Rvm or Fds?mentioning

confidence: 99%

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Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Fofana

Hadjadj

2016

Energies

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Abstract:The condition of the internal cellulosic paper and oil insulation are of concern for the performance of power transformers. Over the years, a number of methods have been developed to diagnose and monitor the degradation/aging of the transformer internal insulation system. Some of this degradation/aging can be assessed from electrical responses. Currently there are a variety of electrical-based diagnostic techniques available for insulation condition monitoring of power transformers. In most cases, the electrical signals being monitored are due to mechanical or electric changes caused by physical changes in resistivity, inductance or capacitance, moisture, contamination or aging by-products in the insulation. This paper presents a description of commonly used and modern electrical-based diagnostic techniques along with their interpretation schemes.

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Section: Frequency Domain Spectroscopymentioning

confidence: 99%

Section: Pdc Rvm or Fds?mentioning

confidence: 99%

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Fofana

Hadjadj

2016

Energies

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“…Transformation of the results from time domain into the frequency domain has been an alternative that allowed reducing measurement duration (e.g., [27,28]). The time of measurement can be reduced down to less than three hours in the lower frequency ranges.…”

Section: −12mentioning

confidence: 99%

On the Feasibility of Using Poles Computed from Frequency Domain Spectroscopy to Assess Oil Impregnated Paper Insulation Conditions

et al. 2013

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Frequency Domain Spectroscopy (FDS) is an effective tool allowing assessing the condition of oil-paper insulation system in power equipment. However, results from these measurements are known to be greatly influenced by various parameters, including insulation aging, moisture content, and insulation geometry/volume, together with environmental condition such as temperature. In this contribution, a series of experiments have been performed under controlled laboratory conditions. The dielectric response of the oil impregnated paper, along with the degree of polymerization and moisture content, were monitored. Since dielectric parameters are geometry dependent, poles (independent of the geometry) which depends on resistivity and permittivity, were considered to assess the condition of the insulation. From the investigations performed on new and aged samples, it is shown that poles (P) can be regarded as insulation aging indicator. It is also shown that a per unit value based on the Dielectric Dissipation Factor (DDF), measured in the frequency range from 1 to 1000 Hz can be correlated to moisture content in the insulation paper.

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“…En conclusion il a été admis que l'utilisation de la transformation PDC-FDS, permet de réduire le temps du diagnostic des transformateurs de puissance [37].…”

Section: Présentation Des Travauxunclassified

“…Ce circuit équivalent proposé par Debye permet de mieux comprendre la fonction de la réponse diélectrique des isolants. Selon ce modèle le processus de la polarisation peut-être modélisé par une mise en parallèle de plusieurs branches et chaque branche étant constituée par un circuit R-C série [36,37,47]. …”

Section: Modélisation Du Papier Imprégné Des Transformateurs Par Le Munclassified

Contribution à l'amélioration de l'interprétation des techniques de diagnostic des transformateurs de puissance par spectroscopie diélectrique /

Bétié¹

2012

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REMERCIEMENTSCe travail a été réalisé au sein de la chaire de recherche du Canada (CRC) sur les Isolants Liquides et Mixtes en Electrotechnologie (ISOLIME). Ce projet s'arrime avec l'un des axes de recherche de la CRC relatif au développement d'outils de diagnostic modernes pour la surveillance des appareils des réseaux d'énergie.Mes remerciements s'adressent en premier lieu à mon directeur de recherche, le professeur Issouf FOFANA, titulaire de la chaire ISOLIME pour avoir encadré et orienté Un grand remerciement à tous mes collègues chercheurs et les étudiants-stagiaires du laboratoire ISOLIME pour la superbe ambiance, favorable au travail que nous avons su créer au sein et en dehors du cadre de travail.Je voudrais adresser mes remerciements à toute ma famille pour le soutien moral et les encouragements tout au long de mes études en générale, mais particulièrement pour la maîtrise en ingénierie.Je tiens enfin à exprimer mes sincères remerciements à mon épouse, Djeneba, pour son inconditionnel soutien et ses encouragements. Unexpected failures cause significant disruption of operating systems, causing unscheduled outages and problems of energy delivery. Extreme reliability is required for distribution to the extent that in case of failure, they inevitably lead to costly repairs, downtime and long possible security risks staff. In addition, environmental aspects such as indirect damage, fires and pollution are at high risk.The increasing need for appropriate tools for the diagnosis of insulation systems of power to non-destructively and reliably led to the development of diagnostic tools such as the measurement in the frequency domain (FDS), the recent years. This technique was found to be sensitive to moisture and insulation aging, that is to say that with this technique it is impossible to predict the real state of the solid insulation of a transformer power and hence to estimate its remaining life.The present research project aims at closing some gaps in our basic knowledge on the dielectric spectroscopic techniques. The main goal is to emphasize the separation between the effect of moisture and aging on the oil paper insulation using frequency domain dielectric measurements. In addition to this main objective, the transformation of measurements performed in time domain to frequency domain with the aim of significantly reducing testing time will be investigated.To carry out this study, accelerated aging tests were conducted on oil impregnated paper insulation used in transformers. The samples of paper were impregnated with oil in a convection oven at 115° C for extended period of 250, 500, 750 and 1000 hours. The analysis of the results showed that it is possible to find a correlation between the degree of polymerization (DP) which indicates the real degradation condition of the paper and the dissipation factor (tanô), indicating the overall condition of the insulation. Indeed, the analysis of the results showed that it is possible to separate the effect of aging and IV moisture of the solid insulation for mo...

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Investigation on the transformation of time domain spectroscopy data to frequency domain data for impregnated pressboard to reduce measurement time

Cited by 21 publications

References 18 publications

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

On the Feasibility of Using Poles Computed from Frequency Domain Spectroscopy to Assess Oil Impregnated Paper Insulation Conditions

Contribution à l'amélioration de l'interprétation des techniques de diagnostic des transformateurs de puissance par spectroscopie diélectrique /

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