Power transformers are very important and expensive components of electricity transmission and distribution networks. Though the failure rate of transformers is generally low, however, in the event of a failure, huge repair costs and long shutdown time are generally needed. The life of insulation decides the service lifetime of the transformers. Several oxidation inhibitors are generally inhibited into the oil in order to improve the lifetime. These inhibitors reduce the oxidation process inside the transformers insulation, and improve the dielectric strength. The present paper determines and compares the effectiveness of 1,2,3-benzotriazole and 2,6-dibutyl-4-methylphenol inhibitors on the oxidation degradation of mineral transformer oil subjected to higher accelerated thermal stresses. It improves the quality and the service lifetime of the insulation in transformers.

Transformer Oil, 1,2,3-benzotriazole, 2,6-dibutyl-4-methylphenol, Aging, Water Content, Flash Point, Interfacial Tension, Breakdown Voltage.
How to Cite this Article?
Ranga, C., Chandel, A. K., and Chandel, R. (2017). Experimental Effectiveness Estimation of Inhibitors on Oxidation Degradation of Oil Impregnated Paper Insulation in Power Transformers. i-manager’s Journal on Power Systems Engineering, 4(4), 1-10.
[1]. L. Yang, S. Gao, and B. Deng, (2016). “Inhibition method for the degradation of oil-paper insulation and corrosive sulphur in a transformer using absorption treatment”. IET Gen. Transmission and Distri., Vol.10, No.8, pp.1893-1900.
[2]. T. Fofana, et al., (2010). “Decay products in the liquid insulation of power transformers”. IET Electr. Power Appl., Vol.4, No.3, pp.177-184.
[3]. J. Singh, et al., (2012). “The influence of service aging on transformer insulating oil parameters”. IEEE Trans. on Dielec. and Elect. Insul., Vol.19, No.2, pp.421-426.
[4]. N. A. Mehanna, et al., (2014). “Assessment of Dibenzyl disulfide and other oxidation inhibitors in transformer mineral oils”. IEEE Trans. on Dielec. and Elect. Insul., Vol.21, No.3, pp.1095-1099.
[5]. P. Juyal, (2012). “Effect of crude oil aging on asphaltene inhibitor product recommendation”. Journal of Dispersion Sci. and Techn., Vol.32, No.8, pp.1096- 1104.
[6]. J. Wada, et al., (2013). “Inhibition technique of transformer insulating oil degradation-evaluation of the effectiveness of oxidation degradation inhibitors”. IEEE Trans. on Dielec. and Elect. Insul., Vol.20, No.5, pp.1641- 1648.
[7]. N. Lelekakis, and J. Wijaya, (2014). “The effect of acid accumulation in power transformer oil on the aging rate of paper insulation”. IEEE Elelc. Insul. Mag., Vol.30, No.3, pp.19-26.
[8]. S. Toyama, K. Mizuno, F. Kato, and T. Amimoto, (2011). “Influence of inhibitor and oil components on copper sulphide deposition on kraft paper in oil immersed insulation”. IEEE Trans. on Dielec. and Elect. Insul., Vol.18, No.6, pp.1877-1885.
[9]. K. Oura, R. N. Hazelwood, and R. M. Fery, (1953). “Stability of DBPC inhibited oil”. Elect. Engg., Vol.72, No.11, p.988.
[10]. P. R. Krishnamoorthy, S. Vijayakumari, and S. Sankaralingam, (1992). “Effect of antioxidants and metal deactivators on the oxidation of transformer oil”. IEEE Trans. on Dielec. and Elect. Insul., Vol.27, No.2, pp.271-277.
[11]. E. D. Treanor, and E. L. Raab, (1951). “DBPC inhibited oil in semi-sealed transformers”. Elect. Engg., Vol.70, No.11, p.984.
[12]. IEEE Standard for the Design, Testing, and Application of Liquid Immersed Distribution, Power, and Regulating Transformers using High Temperature Insulation Systems and Operating at levated temperatures. In: IEEE Std C57.154 (2012), pp.1-49.
[13]. F. Ahmed Khan, and A. Tamboli, (2015). “Effect of DBDS and DBPC on paper oil insulation of power transformers”. IOSR Journal of Elect. and Electronics Engg., Vol.10, No.5, pp.19-28.
[14]. R. M. Hakim, (1972). “The effect of oxidation on the dielectric properties of an insulating oil”. IEEE Trans. on Dielec. and Elect. Insul., Vol.7, No.47, pp.185-195.
[15]. A. Schaut, et al., (2012). “Effects of Irgamet 30 as additive in transformer oil”. IEEE Trans. on Dielec. and Elect. Insul., Vol.19, No.1, pp.175-180.
[16]. ASTM D923-15. Standard Practices for Sampling Electrical Insulating Liquids, ASTM International, West Conshohocken, PA, 2015.
[17]. S. Singha, et al., (2014). “Comparative aging characteristics between a high Oleic natural ester dielectric liquid and mineral oil”. IEEE Trans. on Dielec. and Elect. Insul., Vol.21, No.1, pp.149-158.
[18]. R. Liao, et al., (2011). “A comparative study of physicochemical, dielectric, and thermal properties of pressboard insulation impregnated with natural ester and mineral oil”. IEEE Trans. on Dielec. and Elect. Insul., Vol.18, No.5, pp.1626-1675.
[19]. ASTM D877. Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes, ASTM International, West Conshohocken, PA, 2002.
[20]. V. G. Arakelian, (2002). “Effective diagnostics for oilfilled equipment”. IEEE Electr. Insul. Mag., Vol.18, No.6, pp.26-38.
[21]. T. K. Saha, (2003). “Review of modern diagnostic techniques for assessing the insulation condition in aged transformers”. IEEE Trans. Dielectr. Electr. Insul., Vol.10, No.5, pp.903-917.
[22]. ASTM D971-12. Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method, ASTM International, West Conshohocken, PA, 1991.
[23]. H. M. Wilhelm, et al., (2015). “Evaluation of in-service oxidative stability and antioxidant additive consumption in corn oil based natural ester insulating fluid”. IEEE Trans. on Dielec. and Elect. Insul., Vol.22, No.2, pp.864-868.
[24]. J. Liu, et al., (2015). “Condition evaluation for aging state of transformer oil-paper insulation based on timefrequency domain dielectric characteristics”. Elect. Pow. Comp. and Syst., Vol.43, No.7, pp.759-769.
[25]. ASTM D93-16. Standard Test Method for Flash Point by Pensky-martens Closed Cup Tester, ASTM International, West Conshohocken, PA, 2016.
[26]. D. Martin, et al., (2015). “Determining water in transformer paper insulation: Effect of measuring oil water activity at two different locations”. IEEE Elect. Insul. Mag., Vol.31, No.3, pp.8-25.
[27]. ASTM D4643-08. Standard Test Method for Determination of Water (moisture) Content of Soil by Microwave Over-Heating, ASTM International, West Conshohocken, PA,2008.
[28]. N. A. Bakar, A. Abu-Siada, N. Das, and S. Islam, (2013). “Effect of conducting materials on UV-Vis spectral response characteristics”. Universal Journal Electr. Electron. Eng., Vol.1, No.3, pp.81-86.
[29]. N. A. Bakar, A. Abu-Siada, S. Islam, and M. F. El-Naggar, (2015). “A new technique to measure Interfacial Tension of transformer oil using UV-Vis spectroscopy”. IEEE Trans. Dielectr. and Electr. and EInsul., Vol.22, No.2, pp.1275-1282.
[30]. A. Abu-Siada, (2016). “A novel method of measuring transformer oil Inter facial Tension using UV-Vis spectroscopy”. IEEE Trans. Pow. Deliv., Vol.32, No.1, pp.1- 13.
[31]. ASTM E275-01. Standard Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Nearinfrared Spectrophotometers, ASTM International, West Conshohocken, PA, 2001.
Username / Email
Don't have an account?  Sign Up
  • If you would like institutional access to this content, please recommend the title to your librarian.
    Library Recommendation Form
  • If you already have i-manager's user account: Login above and proceed to purchase the article.
  • New Users: Please register, then proceed to purchase the article.

Purchase Instant Access





We strive to bring you the best. Your feedback is of great value to us. Feel free to post your comments and suggestions.