Aging Effect on Characteristics of Oil Impregnated Insulation Paper for Power Transformers


This paper deals with experimental investigations of the electrical and physical properties of oil impregnated insulation paper for power transformers at different temperatures. The ac breakdown voltage, tensile strength and water content of insulation papers impregnated in mineral oil for different time periods were investigated. The effect of insulation paper thickness on the electrical and mechanical properties has also been studied. The results showed that the breakdown voltage and the tensile strength decreased with increasing the time of immersion of insulation paper in oil at room temperature, at 5 and at -12. Also, the thermal aging effect on the characteristic of insulation paper has been studied. It was found that high temperatures affect the breakdown voltage and the tensile strength to a great extent.

Share and Cite:

L. Nasrat, N. Kassem and N. Shukry, "Aging Effect on Characteristics of Oil Impregnated Insulation Paper for Power Transformers," Engineering, Vol. 5 No. 1, 2013, pp. 1-7. doi: 10.4236/eng.2013.51001.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] R. J. Liao, J. Hao, G. Chen, Z. G. Ma and L. J. Yang, “A Comparative Study of Physicochemical, Dielectric and Thermal Properties of Pressboard Insulation Impregnated with Natural Ester and Mineral Oil,” IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 18, No. 5, 2011, pp. 1626-1637. doi:10.1109/TDEI.2011.6032833
[2] R. J. Liao, S. W. Liang, C. X. Sun, L. J. Yang and H. G. Sun, “A Comparative Study of Thermal Aging of Transformer Insulation Paper Impregnated in Natural Ester and in Mineral Oil,” European Transaction on Electrical Power, Vol. 20, No. 4, 2010, pp. 518-523.
[3] J. Gerhold and T. Tanaka, “Cryogenic Electrical Insulation of Superconducting Power Transmission Lines: Transfer of Experience Learned from Metal Superconductors to High Critical Temperature Superconductors,” Cryogenics, Vol. 38, No. 11, 1998, pp. 1173-1188. doi:10.1016/S0011-2275(98)00105-2
[4] T. A. Prevost and T. V. Oommen, “Cellulose Insulation in Oil-Filled Power Transformers: Part I—History and Development,” IEEE Electrical Insulation Magazine, Vol. 22, No. 1, 2006, pp. 28-35. doi:10.1109/MEI.2006.1618969
[5] H. G. Cheon, S. M. Baek, D. S. Kwag and S. H. Kim, “Comparison of Insulation Test of Mini-Models with Different Winding for a HTS Transformer,” IEEE Tarnsactions on Applied Superconductivity, Vol. 16, No. 2, 2006, pp. 1497-1500. doi:10.1109/TASC.2005.865224
[6] J. M. Young, S. M. Baek and S. H. Kim, “Manufacturingand Test of Model Double Pancake Coils of HTS Transformers for Cryogenic Insulation Design,” IEEE Transactions on Applied Superconductivity, Vol. 14, No. 2, 2004, pp. 928-931. doi:10.1109/TASC.2004.830321
[7] E. F. Pleva, V. Mehrotra and S. W. Schwentrly, “Conductor Requirements for High-Temperature Superconducting Utility Power Transformers,” Superconductor Science and Technology, Vol. 23, No. 1, 2010, pp. 14-25.
[8] H. Z. Ding, Z. D. Wand and P. N. Janrman, “Effect of Ageing on the Impulse Breakdown Strength of Oil Impregnated Pressboard Used in Power Transformers,” IEEE Conference on Electrical Insulation and Dielectric Phenomenon, Kansas City, 15-18 October 2006, pp. 497500.
[9] T. K. Saha and P. Purkait, “Understanding the Impacts of Moisture and Thermal Ageing on Transformer’s Insulation by Dielectric Response and Molecular Weight Measurements,” IEEE Transactions on dielectrics and Electric Insulation, Vol. 15, No. 2, 2008, pp. 568-582.
[10] K. Othmer, “Encyclopedia of Chemical Technology,” 2nd Edition, Vol. 4, Wiley, New York, 1967.
[11] The Institute of Papermaking, “Appelton,” Wisconsin Institute, Method No. 411, 1951.
[12] I. Rusznak and K. Zimmer, “Initial Processes in the Thermolysis of Cellulose Fibers,” Proceedings of Hungarian Textile Conference, Vol. 2, 1971, pp. 119-139.
[13] K. J. Rapp, C. P. McShane and J. Lukisich, “Interaction Mechanisms of Natural Ester Dielectric Fluid and Kraft Paper,” IEEE International Conference on Dielectric Liquids, Portugal, 26 June-1 July 2005, pp. 393-396. doi:10.1109/ICDL.2005.1490108
[14] K. Dumke, H. Borsi and E. Gockenback, “Fundamental Investigations on the Influence of Temperature and Water Content on the Electrical Behavior of Fluid Impregnated Insulating Papers,” Conference Record of the 1996 IEEE International Symposium on Electrical Insulation, Montereal, 16-19 June 1996, pp. 542-545.
[15] T. V. Oommen, “Moisture Equilibrium Charts for Transformer Insulation Drying Practice,” IEEE Transactions on Power Apparatus and Systems, Vol. 103, No. 10, 1984, pp. 3063-3067.
[16] R. Liao, C. Tang, L. Yang and S. Grzybowski, “Thermal Ageing Microscale Analysis of Power Transformer Pressboard,” IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 15, No. 5, 2008, pp. 1281-1287.

Copyright © 2024 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.