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Influence of transformer oil particle contamination on its dielectric hardness

P. OSMOKROVIĆ1,* , Z. JEREMIĆ2, M. PEŠIĆ3, Z. LAZAREVIĆ1

Affiliation

  1. Faculty of Electrical Engineering, University of Belgrade Bulevar Kralja Aleksandra 73, 11000 Belgrade, Serbia
  2. Elektromorava, 12000 Požarevac, Serbia
  3. Power Delivery Co, Masarikova 1-3, 11000 Belgrade, Serbia

Abstract

Influence of particles of metal and non-metal origin, generated during transformer production and exploitation, on transformer oil dielectric hardness is investigated in this paper. For that purpose, particle analysis and dielectric investigations were performed on samples of new oil and oil taken during transfomrer exploitation, both before and after filtration. Samples were taken from particular levels of the transformer. Sampling and all measurements were made in accordance with valid ISO standards for oil testing. Based on the obtained results, it has been concluded that parameters defining statistical distribution of the random variable "breakdown voltage" are dependent on the concentration of particles in oil. The reason for this is found in local destruction of insulating oil, produced by highly non-homogeneous electric field surrounding particles of metal origin. Reversibility of transformer oil dielectric characteristics after electric breakdown is also considered..

Keywords

Particles in oil, ISO standard for oil testing, Insulating characteristics, Particle analysis, Dielectric characteristics, Statistical distribution.

Submitted at: Aug. 26, 2007
Accepted at: Dec. 7, 2007

Citation

P. OSMOKROVIĆ, Z. JEREMIĆ, M. PEŠIĆ, Z. LAZAREVIĆ, Influence of transformer oil particle contamination on its dielectric hardness, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3885-3888 (2007)