Investigations of copper sulfide diffusion into paper insulation of transformers

Rajan, J. S. and Flora, S. D. and Ranganathaiah, C. (2016) Investigations of copper sulfide diffusion into paper insulation of transformers. IEEE Transactions on Dielectrics and Electrical Insulation, 23 (4). pp. 2421-2429. ISSN 1070-9878

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Official URL: https://doi.org/10.1109/TDEI.2016.7556521

Abstract

It is well established that copper sulfide is formed due to reaction of sulfur with copper conductors in transformers and reactors. However, there is very little experimental evidence to demonstrate copper sulfide diffusion into bulk of paper. Diffusion experiments have been carried out on three samples of kraft paper having different thickness. Positron Annihilation Lifetime Spectroscopy has been used to investigate the possibilities of copper sulfide diffusion into bulk of paper. This study has demonstrated that copper sulfide can diffuse into the bulk of paper leading to either increase or decrease in free volume of paper. The reasons for changes in free volume of paper due to copper sulfide deposits are explained. The consequences of copper sulfide diffusion on PD, voltage-current characteristics under ac and volume resistivity are discussed. Electric field simulation has been used to explain the effects of Cu ions and copper sulfide formation on electric stress distribution across paper.

Item Type: Article
Additional Information: Unmapped bibliographic data: VO - 23 [Field not mapped to EPrints] JA - IEEE Transactions on Dielectrics and Electrical Insulation [Field not mapped to EPrints] JO - IEEE Transactions on Dielectrics and Electrical Insulation [Field not mapped to EPrints]
Uncontrolled Keywords: conductors (electric), copper compounds, paper, reactors (electric), transformer insulation, Cu<sub>2</sub>S, PD, ac resistivity, copper conductor, copper sulfide diffusion, electric field simulation, electric stress distribution, kraft paper, positron annihilation lifetime spectroscopy, reactors, transformer paper insulation, voltage-current characteristics, volume resistivity, Copper, Mathematical model, Oil insulation, Polymers, Positrons, Power transformer insulation, Sulfur, Electrical grade paper, PD, Positron lifetime, cellulose, copper corrosion, copper sulfide, free volume
Subjects: Physical Sciences > Physics
Divisions: PG Campuses > Manasagangotri, Mysore > Physics
Depositing User: Praveen Kumari B.L
Date Deposited: 07 Sep 2017 05:06
Last Modified: 07 Sep 2017 05:06
URI: http://eprints.uni-mysore.ac.in/id/eprint/19891

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