Experimental Study of the Leakage Current in Coated Insulators Under Salt-Fog Conditions
The accumulation of contaminants in electrical insulators reduce their performance and may lead to failures. Estimating the degree of pollution of in-service equipment is not a trivial task as the process of contamination depends on several factors. It is necessary to monitor the insulators so that preventive measures can be taken in a timely manner. In this context, this paper aims to study how the amplitude, angular phase and total harmonic distortion (THD) of the leakage current can be used to monitor insulators and how these parameters are affected by the application of hydrophobic coatings. For this purpose, standard uncoated and coated glass insulator samples were subjected to electrical tests in a salt-fog chamber while the leakage current was monitored. The results show that the analyzed parameters provide relevant information about the insulation condition and how the application of hydrophobic coatings results in improvements in the insulator performance.
BASHIR, N.; AHMAD, H. Odd harmonics and third to fifth harmonic ratios of leakage currents as diagnostic tools to study the ageing of glass insulators. IEEE Transactions on Dielectrics and Electrical Insulation, v. 17, n. 3, p. 819–832, June 2010. ISSN 1070-9878.
FRONTIN, S. O.; SAAVEDRA, A. R.; ARAÚJO, J. A.; MURçA, L. B.; FRAGELLI, R. R.; RÊGO, V. B.; ABREU, A. M. Prospecção e hierarquização de inovações tecnológicas aplicadas a linhas de transmissão. Brasília, DF: Goya Editora, 2010. ISBN 978-85-88041-02-8.
GUIDE, S. 92/1 hydrophobicity classification guide. Swedish Transmission Research Institute, 1992.
INMR. Station Experience with RTV-CoatedGlass Insulators. 2018. Available:
KUFFEL, E.; ZAENGL, W. S.; KUFFEL, J. High voltage engineering fundamentals. Woburn, MA: Newnes, 2000. ISBN 978-0750636346.
SUWARNO. Diagnostics of outdoor insulators using leakage current waveform parameters. In: Proceedingsof 2005 International Symposium on Electrical Insulating Materials, 2005. (ISEIM 2005). [S.l.:s.n.], 2005. v. 1, p. 111–114 Vol. 1.
SYAKUR, A.; BERAHIM, H.; ROCHMADI, T. Leakage current monitoring for silane epoxy resin insulator under tropical climate conditions. In: 2012 IEEE International Conference on Condition Monitoring and Diagnosis. [S.l.: s.n.], 2012. p. 878–881.
VINOTHKUMAR, R.; KANNAYERAM, G.; SHUNMUGALAKSHMI, G. Investigation of natural and artificial contamination on various types of insulators. In: 2015 International Conference on Innovations in Information, Embedded and Communication Systems (ICIIECS). [S.l.: s.n.], 2015. p. 1–6.