Classification of Discharges Initiated by Liquid Droplet on Insulation Material under AC Voltages Adopting UHF Technique

Authors: R. Sarathi, G. Nagesh, K. Vasudevan

Abstract:

In the present work, an attempt has been made to understand the feasibility of using UHF technique for identification of any corona discharges/ arcing in insulating material due to water droplets. The sensors of broadband type are useful for identification of such discharges. It is realised that arcing initiated by liquid droplet radiates UHF signals in the entire bandwidth up to 2 GHz. The frequency content of the UHF signal generated due to corona/arcing is not much varied in epoxy nanocomposites with different weight percentage of clay content. The exfoliated/intercalated properties were analysed through TEM studies. It is realized that corona initiated discharges are of intermittent process. The hydrophobicity of the material characterized through contact angle measurement. It is realized that low Wt % of nanoclay content in epoxy resin reduces the surface carbonization due to arcing/corona discharges. The results of the study with gamma irradiated specimen indicates that contact angle, discharge inception time and evaporation time of the liquid are much lower than the virgin epoxy nanocomposite material.

Keywords: Arcing, Corona, epoxy resin, insulation, nanocomposites, UHF signal, water droplet.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1075635

References:

[1] T. Tanaka, G.C. Montanari and R. Mulhaupt, IEEE Trans. on Dielectrics and Electrical Insulation, Vol-11, pp763-784, 2004.
[2] M. Kozako, N. Fuse, Y. Ohki, T. Okamoto and T. Tanaka, IEEE Trans. on Dielectrics and Electrical Insulation, Vol-11, No.5, pp833-839, 2004.
[3] Gorur.R.S; Edward A.Cherney; Jeffrey T.Burnham; Outdoor Insulators (Ravi S. Gorur, Inc., Phoenix, Arizona 85044, USA), 1999.
[4] T. Lan, T.J. Pinnavaia, Chemistry of materials, Vol-6, pp2216-2219, 1994.
[5] T.J. Pinnavaia and G.W. Beall, Wiley series in polymer science, New york, 2000.
[6] C. Zilg, R. Mulhaupt, J. Finter, Macromol. Chem.Phys., Vol-200, pp661- 670, 1999.
[7] M. Alexandre and P. Dubois, Materials science and Engineering, Vol- 28, pp1-63, 2000.
[8] P.B. Messersmith, E.P. Giannelis, Chemistry of materials, Vol-6, 1719- 1725, 1994.
[9] Yong Zhu, Kenichi Haji, Masahisa Otsubo, Chikahisa Honda and Noriyuki Hayashi, J. Phys. D: Appl. Phys. Vol-39, pp1970-1975, 2006.
[10] S.W. Rowland and F.C. Lin, J. Phys.D: Appl. Phys, Vol- 39, pp3067- 3076, 2006.
[11] T. Suda, IEEE Transactions on Dielectrics and Electrical Insulation, Vol.8, No.4, pp.705-709, 2001.
[12] Lopes.I.J.S, S.H. Jayaram,and Edward A. Cherney, IEEE Trans. On Dielectrics and Electrical Insulation, Vol-8, No.2, PP262-268, 2001.
[13] Alistair J Reid, M.D. Judd, B.G. Stewart and R.A. Fouracre, J. of Phys.D: Appl. Phys., Vol-39, pp4167-4177, 2006.
[14] M.D. Judd, O. Farish and B.F. Hampton, IEEE Trans. On dielectrics and electrical insulation, Vol-3, No.2, pp213-228, 1996.
[15] G.P. Cleary and M.D. Judd, IEE Proc.- Sci. Meas. Technol. Vol153, No.2, pp47-54, 2006.
[16] M.D. Judd, Li Yang, Ian B.B. Hunter, IEEE Electrical Insulation Magazine, Vol-21, No.3, pp5-13, 2005.
[17] Rogier A Jongen, Peter Morshuis, Sander Meijer and Johan J. Smit, 2005 Annual Report Conference on Electrical Insulation and dielectric phenomena, pp565-568, 2006.
[18] M.D. Judd, Li Yang, Ian B.B. Hunter, IEEE Electrical Insulation magazine, Vol-21, No.2, pp5-14, 2005.
[19] M.D. Judd, Li Yang, Ian B.B. Hunter, IEEE Electrical Insulation Magazine, Vol-21, No.3, pp5-13, 2005.
[20] Rogier A Jongen, Peter Morshuis, Sander Meijer and Johan J. Smit, 2005 Annual Report Conference on Electrical Insulation and dielectric phenomena, pp565-568, 2006.
[21] Southern clay products., Inc, Technical data.
[22] IEC publication 60 587. Testing method for evaluating the resistance of tracking and erosion of electrical insulating materials used under severe ambient conditions, 1984.
[23] Crank J,Mathematics of Diffusion (Oxford:clarendon), 2nd Edition,1975.