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Silver Corrosion in Transformers

Silver Corrosion in Transformers
Silver Corrosion in Transformers
The impact of corrosive sulfur on high value assets such as transformers is widely reported and can be considered a global problem. A great deal of research and development is focused on the remediation of corrosive transformers and the mitigation of future corrosion. Regeneration of aged and or corrosive oil by filtration through bauxite clays is a common method for removal of polar molecules and many sulphurous compounds such as dibenzyl-disulfide (DBDS). This process is largely successful, although over the last several years, increased corrosion and even total failure of transformers has been linked with the reclamation process. In some cases, the corrosion associated with a recent reclamation is selective for silver rather than copper. By thoroughly understanding the chemistry occurring during aged oil reclamation, it will be possible to take appropriate measures to limit the formation of corrosive species during future reclamation and regeneration processes. There is a requirement to minimize the amount of oil wastage during reclamation for both environmental and commercial reasons. It is also important that any changes made to the reclamation process do not have a detrimental effect on the health and life-expectancy of the transformer. This paper describes studies carried out to track the total sulfur content of oil samples taken from two different locations (transformer main tank and reclamation rig buffer tank), at multiple time intervals during an oil reclamation procedure. By tracking the total sulfur content, it is possible to determine when and where maximum sulphur accumulation occurs, possibly indicating the best point at which a portion of oil should be disposed. Once a fuller understanding of the sulfur content is obtained, GC-MS will be used to gain a detailed understanding of the types of sulfurous species present in the oil.
448-451
Holt, A F
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Facciotti, M
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Amaro, P S
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Brown, R C D
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Lewin, P L
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Pilgrim, J A
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Wilson, G
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Jarman, P
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Holt, A F
6a6195df-03d6-4174-a504-8ca2965e52df
Facciotti, M
3c5dd179-8124-4d79-99b2-faa2aa37e96f
Amaro, P S
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Brown, R C D
21ce697a-7c3a-480e-919f-429a3d8550f5
Lewin, P L
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Pilgrim, J A
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Wilson, G
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Jarman, P
390aafbd-393e-4e20-bace-b4416e0dd456

Holt, A F, Facciotti, M, Amaro, P S, Brown, R C D, Lewin, P L, Pilgrim, J A, Wilson, G and Jarman, P (2013) Silver Corrosion in Transformers. IEEE 2013 Conference on Electrical Insulation and Dielectric Phenomena, Shenzhen, China. 19 - 22 Oct 2013. pp. 448-451 .

Record type: Conference or Workshop Item (Paper)

Abstract

The impact of corrosive sulfur on high value assets such as transformers is widely reported and can be considered a global problem. A great deal of research and development is focused on the remediation of corrosive transformers and the mitigation of future corrosion. Regeneration of aged and or corrosive oil by filtration through bauxite clays is a common method for removal of polar molecules and many sulphurous compounds such as dibenzyl-disulfide (DBDS). This process is largely successful, although over the last several years, increased corrosion and even total failure of transformers has been linked with the reclamation process. In some cases, the corrosion associated with a recent reclamation is selective for silver rather than copper. By thoroughly understanding the chemistry occurring during aged oil reclamation, it will be possible to take appropriate measures to limit the formation of corrosive species during future reclamation and regeneration processes. There is a requirement to minimize the amount of oil wastage during reclamation for both environmental and commercial reasons. It is also important that any changes made to the reclamation process do not have a detrimental effect on the health and life-expectancy of the transformer. This paper describes studies carried out to track the total sulfur content of oil samples taken from two different locations (transformer main tank and reclamation rig buffer tank), at multiple time intervals during an oil reclamation procedure. By tracking the total sulfur content, it is possible to determine when and where maximum sulphur accumulation occurs, possibly indicating the best point at which a portion of oil should be disposed. Once a fuller understanding of the sulfur content is obtained, GC-MS will be used to gain a detailed understanding of the types of sulfurous species present in the oil.

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Published date: 20 October 2013
Venue - Dates: IEEE 2013 Conference on Electrical Insulation and Dielectric Phenomena, Shenzhen, China, 2013-10-19 - 2013-10-22
Organisations: EEE

Identifiers

Local EPrints ID: 360743
URI: http://eprints.soton.ac.uk/id/eprint/360743
PURE UUID: 3a99b59f-eeb0-41be-8355-768f3bf09feb
ORCID for R C D Brown: ORCID iD orcid.org/0000-0003-0156-7087
ORCID for J A Pilgrim: ORCID iD orcid.org/0000-0002-2444-2116

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Date deposited: 19 Dec 2013 18:52
Last modified: 21 Nov 2021 02:57

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Contributors

Author: A F Holt
Author: M Facciotti
Author: P S Amaro
Author: R C D Brown ORCID iD
Author: P L Lewin
Author: J A Pilgrim ORCID iD
Author: G Wilson
Author: P Jarman

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