NDLI: Tracking copper sulfide formation in corrosive transformer oil

Content Provider	IEEE Xplore Digital Library
Author	Amaro, P.S. Facciotti, M. Holt, A.F. Pilgrim, J.A. Lewin, P.L. Brown, R.C.D. Wilson, G. Jarman, P.
Copyright Year	2013
Description	Author affiliation: Nat. Grid House, Nat. Grid, Warwick, UK (Wilson, G.; Jarman, P.) \|\| Univ. of Southampton, Southampton, UK (Amaro, P.S.; Facciotti, M.; Holt, A.F.; Pilgrim, J.A.; Lewin, P.L.; Brown, R.C.D.)
Abstract	Corrosive sulfur in the last decade has been recognized as a major risk to high voltage transformers. An initial study undertaken by CIGRE on copper sulfide in transformer insulation investigated possible sources, i.e. Dibenzyl Disulfide (DBDS), it also looked at possible mitigating techniques, i.e. passivation, environmental influences, i.e. temperature, and improvement to oil corrosion standards, i.e. EN 62535. Although there was significant volume of research undertaken the high voltage industry still felt there is a lack of understanding in the process of copper sulfide formation and long-term effects of mitigation techniques. Hence a new CIGRE transformer working group, A2.40, was created. The identification of techniques with the ability to track the mechanism of copper sulfide $(Cu_{2}S)$ formation is fundamental to the current research objectives. The technique suggested in this paper involves the use of X-ray fluorescence (XRF), which is used for elemental analysis, to track the quantity of sulfur in the oil. As the deposits of $Cu_{2}S$ form in the conductors and paper insulation the amount of sulfur in the oil decreases. By using a series of laboratory experiments is possible to investigate how the rate of formation of $Cu_{2}S$ changes with time, suggesting that there is an initial chemical reaction needed for the $Cu_{2}S$ deposits to form. Scanning Electron Microscopy with Energy-dispersive X-ray spectroscopy (SEM-EDX) has been used to investigate the surface of copper at several different stages of the copper sulfide formation. By manipulating variables, i.e. temperature, it is possible to map their influence and provide a more precise risk assessment of transformer with corrosive oil to electrical utility companies. The experimental results suggest the possibility of developing a method to indirectly measure $Cu_{2}S$ deposition on conductors and insulation paper by tracking sulfur concentration changes in the transformer oil.
Sponsorship	IEEE Dielectr. Electr. Insul. Soc.
Starting Page	144
Ending Page	147
File Size	1404413
Page Count	4
File Format	PDF
ISBN	9781479925971
DOI	10.1109/CEIDP.2013.6747071
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-20
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Copper Power transformer insulation Oil insulation Aging Corrosion
Content Type	Text
Resource Type	Article

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