Influence of metal transformer materials on oil-paper insulation after thermal aging

This study investigated the influence of the main metal materials of transformers on the oil-paper insulation performance. Ten types of insulating specimens were subjected to accelerated thermal aging at 120°C. Some aging parameters, including oil acid number, furfural content and degree of polymerization (DP) of insulating paper, were measured and compared. At the same time, we conducted frequency domain spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry on the insulating paper. The following conclusions were drawn: silicon lamination slightly deteriorates the insulating oil, copper increases the acidity and accelerates the production of furfural, metal materials can decrease DP of insulating paper and the effect of copper is greater than that of silicon lamination. During thermal aging, the dielectric dissipation factor of insulating paper increases and the carbon content of insulating paper increases. Metal materials can significantly increase the dielectric dissipation factor and carbon content of insulating paper and the effect of copper is greater than that of silicon lamination.

[1]  Zhiping Zhu,et al.  Quantitative detection and impact evaluation of phthalate plasticizers in insulating oil , 2016, IEEE Transactions on Dielectrics and Electrical Insulation.

[2]  B. Chatterjee,et al.  Estimation of dielectric dissipation factor of cellulosic parts in oil-paper insulation by frequency domain spectroscopy , 2016, IEEE Transactions on Dielectrics and Electrical Insulation.

[3]  Wei Yao,et al.  Influence of acids on the electrical lifetime of vegetable oil impregnated paper insulation , 2016, 2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE).

[4]  Z. Wang,et al.  Assessment of regenerated oil through accelerated thermal ageing experiments , 2015, 2015 50th International Universities Power Engineering Conference (UPEC).

[5]  Issouf Fofana,et al.  Relationships between methanol marker and mechanical performance of electrical insulation papers for power transformers under accelerated thermal aging , 2015, IEEE Transactions on Dielectrics and Electrical Insulation.

[6]  J. Jalbert,et al.  Understanding ethanol versus methanol formation from insulating paper in power transformers , 2015, Cellulose.

[7]  Xiao Zhang,et al.  An improved X-ray diffraction method for cellulose crystallinity measurement. , 2015, Carbohydrate polymers.

[8]  Stanislaw Grzybowski,et al.  Investigation on thermal aging characteristics of vegetable oil-paper insulation with flowing dry air , 2013, IEEE Transactions on Dielectrics and Electrical Insulation.

[9]  Jocelyn Jalbert,et al.  Robust and sensitive analysis of methanol and ethanol from cellulose degradation in mineral oils. , 2012, Journal of chromatography. A.

[10]  Ung-Jin Kim,et al.  X-ray diffraction study on the thermal expansion behavior of cellulose Iβ and its high-temperature phase , 2010 .

[11]  Caixin Sun,et al.  Influence of the copper ion on aging rate of oil-paper insulation in a power transformer , 2009 .

[12]  A. Setayeshmehr,et al.  Dielectric spectroscopic measurements on transformer oil-paper insulation under controlled laboratory conditions , 2008, IEEE Transactions on Dielectrics and Electrical Insulation.

[13]  Jocelyn Jalbert,et al.  Identification of a chemical indicator of the rupture of 1,4-β-glycosidic bonds of cellulose in an oil-impregnated insulating paper system , 2007 .

[14]  A. Graczkowski,et al.  Frequency response of oil impregnated pressboard and paper samples for estimating moisture in transformer insulation , 2006, IEEE Transactions on Power Delivery.

[15]  Hossein Borsi,et al.  Challenge of mixed insulating liquids for use in high-voltage transformers. II. Investigations of mixed liquid impregnated paper insulation , 2002 .

[16]  J. Unsworth,et al.  Degradation of electrical insulating paper monitored with high performance liquid chromatography , 1990 .

[17]  A. M. Emsley,et al.  THE KINETICS AND MECHANISMS OF DEGRADATION OF CELLULOSIC INSULATION IN POWER TRANSFORMERS , 1994 .