Detection of oil-pressboard insulation aging with dielectric spectroscopy in time and frequency domain measurements

Hassan, Omar Abu; Shyegani, A.A.; Borsi, H.; Gockenbach, E.; Abu-Elzahab, E.M.; Gilany, Mahmoud

doi:10.1109/icsd.2004.1350518

Cited by 15 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Experiments using the return voltage measurement method [44], depolarizing current method [45,46], and frequency domain dielectric spectroscopy [47][48][49] have revealed that the free radical chain reaction process of autoxidation will occur in the mineral insulating oil during aging, which increases the acid content of the mineral insulating oil. Resinous substances, oligomers, and viscous substances with high molecular weight will be generated through further condensation reactions between acid and alcohol species.…”

Section: Dielectric Constant Of Mineral Insulating Oilmentioning

confidence: 99%

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

et al. 2018

View full text Add to dashboard Cite

Abstract:In November 2017, the first ±1100 kV high-voltage direct-current power transformer in the world, which was made by Siemens in Nurnberg, passed its type test. Meanwhile, in early 2017, a ±1000 kV ultra-high voltage (UHV) substation was officially put into operation in Tianjin, China. These examples illustrate that the era of UHV power transmission is coming. With the rapid increase in power transmission voltage, the performance requirements for the insulation of power transformers are getting higher and higher. The traditional mineral oils used inside power transformers as insulating and cooling agents are thus facing a serious challenge to meet these requirements. In this review, the basic properties of traditional mineral insulating oil are first introduced. Then, the variation of electrical properties such as breakdown strength, permittivity, and conductivity during transformer operation and aging is summarized. Next, the modification of mineral insulating oil is investigated with a focus on the influence of nanoparticles on the electrical properties of nano-modified insulating oil. Recent studies on the performance of mineral oil at molecular and atomic levels by molecular dynamics simulations are then described. Finally, future research hotspots and notable research topics are discussed.

show abstract

Section: Dielectric Constant Of Mineral Insulating Oilmentioning

confidence: 99%

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Omar et al [30], Entreprennent des études afin de déterminer l'influence du • La méthode RVM ne peut pas être utilisée pour obtenir une séparation de l'effet du vieillissement et de l'humidité car parmi les paramètres à considérer, la constante de temps centrale est très sensible au vieillissement et à l'humidité et de plus, aux hautes températures, les pics des spectres RV sont obtenus pour des temps très faibles.…”

Section: Mesure Dans Le Domaine Des Fréquences (Fds)unclassified

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

Bétié¹

2012

View full text Add to dashboard Cite

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...

show abstract

“…Transformer oil and kraft paper become aged constantly [2] [5]. The aged status of oil-paper has a great impact on space charge characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effects of oil thermal aged states on the space charge behavior in oil-paper insulation

Wang

et al. 2012

2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials

View full text Add to dashboard Cite

Tn order to understand effects of oil thermal aged state on space charge behaviors in oil-paper insu lation further, transformer oil with different aged states is prepared by accelerated thennal aging. What's more analysis on physical and chemical properties of oil is made. The samples are made of new kraft paper which is dried in vacuum and oil with different thermal aged states. The pulsed electro-acoustic (PEA) method is used for space charge measurement under conditions of both voltage-on and voltage-off at room tempera ture(l5°C). The impact of oil aged state on space charge injection, accumulation and decay characters was discussed. The experimental results show homo-charge inject into samples when the voltage is on. The more the oil aged state is, the larger the total space charges quantity and the area of negative charges.For voltage-off condition, aged oil-paper samples are beneficial to space charge decay.

show abstract

Detection of oil-pressboard insulation aging with dielectric spectroscopy in time and frequency domain measurements

Cited by 15 publications

References 4 publications

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

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

Effects of oil thermal aged states on the space charge behavior in oil-paper insulation

Contact Info

Product

Resources

About