Investigations of copper sulfide diffusion into paper insulation of transformers

Sundara Rajan, J. and Daisy Flora, S. 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.

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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
Uncontrolled Keywords: conductors (electric);copper compounds;paper;reactors (electric);transformer insulation;transformer paper insulation;copper sulfide diffusion;copper conductor;reactors;kraft paper;positron annihilation lifetime spectroscopy;PD;voltage-current characteristics;volume resistivity;ac resistivity;electric field simulation;electric stress distribution;Cu2S;Copper;Polymers;Positrons;Mathematical model;Power transformer insulation;Oil insulation;Sulfur;Electrical grade paper;copper sulfide;copper corrosion;PD;Positron lifetime;free volume;cellulose
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: Manjula P Library Assistant
Date Deposited: 19 Jun 2019 11:25
Last Modified: 19 Jun 2019 11:25

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