Activation energy of transformer oils

• Autorzy: Mentlik V. , Polanský R. , Prosr P. , Pihera J.

Warianty tytułu

PL

Energia aktywacji olejów transformatorowych

• Konferencja: Problemy eksploatacji maszyn i napędów elektrycznych (2008; Rytro, Polska)
• Języki publikacji: EN

Abstrakty

EN

The power transformers are the key components of power grid from the reliability point of view. Due to operation conditions, aging of particular parts of power transformers appears and this fact also causes changes of the important electrical and mechanical properties. Transformer working life is given by a working life of its insulating system. The insulating system of these devices is inseparably composed of the solid (based on cellulose) and oil insulation. Liquid part fulfils besides the insulation also cooling function and the analysis of this part of insulating system during the laboratory thermal aging became the main aim of our experiment. Activation energy was chosen as the main parameter corresponding to the actual condition of insulating oil. Two groups of insulating oils were examined. Three kinds of mineral petroleum-based oils are in the first one (common commercial products - Technol, ITO 100, BTSi); the second group contains three oils based on synthetic esters (Dibutyl phthalate - dibutyl ester of phthalic acid, Dioctyladipate - di(2-ethylhexyl) ester of adipic acid, Diisobutyl adipate - bis(2-methylpropyl) ester of adipic acid). The activation energy was measured by thermogravimetry analysis. Thermal aging process has been still processing due to extensiveness of this project. Meanwhile, the activation energy was analyzed on the samples in virgin state and after 1000, 2000 and 3000 hours of thermal aging at the temperature of 90 °C.

Słowa kluczowe

PL

olej transformatorowy; energia aktywacji

• Wydawca: Sieć Badawcza Łukasiewicz - Górnośląski Instytut Technologiczny
• Czasopismo: Maszyny Elektryczne : zeszyty problemowe
• Rocznik: 2008
• Tom: Nr 80
• Strony: 45--49
• Opis fizyczny: Bibliogr. 10 poz., rys., tab.

Twórcy

autor

Mentlik V.

autor

Polanský R.

autor

Prosr P.

autor

Pihera J.

• University of West Bohemia in Pilsen, Faculty of Electrical Engineering, Department of Technologies and Measurement, Univerzitni 26, 306 14, Pilsen, Czech Republic,

Bibliografia

• [1]. B. Pahlavanpour "Reducing the risk of insulation failure" Naphtenics market magazine 4/2007.
• [2]. I. L. Hosier, S. J. Sutton, F. J. Davis, "Chemical, Physical and Electrical Properties of Aged Dodecylbenzene: Thermal Ageing of Mixed Isomers", IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 14, pp. 1113-1124 No. 5; October 2007.
• [3]. T. K. Saha, "Review of modern diagnostic techniques for assessing insulation condition in aged transformers", IEEE Transactions on Dielectrics and Electrical Insulation. Vol. 10, pp. 903-917, 2003.
• [4]. R. C. Mackenzie, Nomenclature in thermal analysis : Part IV.. J. Thermal Anal. 1978, vol. 13, no. 2, s. 387-392.
• [5]. ASTM E 1641-07 "Standard Test Method for Decomposition Kinetics by Thermogravimetry". ASTM International, 2007.
• [6]. TA Instruments. "Estimation of Polymer Lifetime by TGA Decomposition Kinetics : Thermal Analysis Application Brief [online]. 2007, 2007 [cit. 2008-02-09]. WWW: <http://www.tainstruments.com>.
• [7]. J. H. Flynn, et. al., Polym. Lett., B4, 323 (1966).
• [8]. V. Mentlik, P. Prosr, R. Polanský "Aging of Petroleum and Synthetic Based Insulation Oils from the View of Structural Analyse". In 16th IEEE International Conference on Dielectric Liquids, Poitiers-France .
• [9]. P. Prosr, R. Polanský, J. Pihera, P. Trnka "Influence of oil type on the oil-paper insulation properties". In 2007 Annual Report Conference on Electrical Insulation and Dielectric Phenomena. Vancouver : IEEE DEIS, 2007. p. 77-80.
• [10]. P. Trnka, J. Pihera, P. Prosr, R. Polanský "Temperature Aging of the Selected Synthetic and Mineral Transformer Insulation Systems". In Annals of DAAAM for 2007 & Proceedings of 18th International DAAAM Symposium. Vienna : DAAAM International Vienna, 2007. p. 777-778.