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An Initial Study Into Silver Corrosion in Transformers Following Oil Reclamation.

An Initial Study Into Silver Corrosion in Transformers Following Oil Reclamation.
An Initial Study Into Silver Corrosion in Transformers Following Oil Reclamation.
The problem of corrosive sulfur is extremely well documented in the electrical power industry and to some extent remains a global problem. The presence of corrosive sulfur in transformers is widely reported as a cause of sudden and unexpected failure. Regeneration of transformer oil using a reactivating sorbent in the form of bauxite clays has proven effective in removal of oxidation products in transformer oils. Unfortunately, in some cases, increased levels of silver corrosion have been observed shortly after oil reclamation. It is, therefore,important to understand fully the chemistry occurring both during the oil reclamation and during silver corrosion. Once a fuller understanding of the causes of increased oil corrosivity is obtained, effective precautions can be taken to limit the formation of corrosive species, whilst minimizing the volume of oil wastage during reclamation. In this paper, the problem of silver corrosion is discussed. Initial results from corrosion tests using transformer oils are described, with particular attention paid to the analytical methods used. Scanning electron microscopy coupled with energy-dispersive x-ray spectroscopy(SEM-EDX) was found to be a good method of characterizing the topology and elemental composition of the corroded silver surface. In terms of the oil composition, x-ray fluorescence spectroscopy is a very effective method for monitoring total sulfur and copper content. It is anticipated that once corrosive species are identified from the buffer tank samples, it will be possible to target such species in future analyses, allowing the detection of corrosive species at very low concentrations.
978-1-4673-4739-6
469-472
Holt, A F
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Facciotti, M
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Amaro, P S
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Pilgrim, J A
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Lewin, P L
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Brown, R C D
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Wilson, G
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Jarman, P N
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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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Pilgrim, J A
4b4f7933-1cd8-474f-bf69-39cefc376ab7
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Brown, R C D
21ce697a-7c3a-480e-919f-429a3d8550f5
Wilson, G
25fbd90e-6949-481c-9e75-0d457003c839
Jarman, P N
8e6247bc-f98c-4dac-b150-b7213f2184d5

Holt, A F, Facciotti, M, Amaro, P S, Pilgrim, J A, Lewin, P L, Brown, R C D, Wilson, G and Jarman, P N (2013) An Initial Study Into Silver Corrosion in Transformers Following Oil Reclamation. INSUCON 2013, International Electrical Insulation Conference, Ottawa, Canada. 01 - 04 Jun 2013. pp. 469-472 .

Record type: Conference or Workshop Item (Paper)

Abstract

The problem of corrosive sulfur is extremely well documented in the electrical power industry and to some extent remains a global problem. The presence of corrosive sulfur in transformers is widely reported as a cause of sudden and unexpected failure. Regeneration of transformer oil using a reactivating sorbent in the form of bauxite clays has proven effective in removal of oxidation products in transformer oils. Unfortunately, in some cases, increased levels of silver corrosion have been observed shortly after oil reclamation. It is, therefore,important to understand fully the chemistry occurring both during the oil reclamation and during silver corrosion. Once a fuller understanding of the causes of increased oil corrosivity is obtained, effective precautions can be taken to limit the formation of corrosive species, whilst minimizing the volume of oil wastage during reclamation. In this paper, the problem of silver corrosion is discussed. Initial results from corrosion tests using transformer oils are described, with particular attention paid to the analytical methods used. Scanning electron microscopy coupled with energy-dispersive x-ray spectroscopy(SEM-EDX) was found to be a good method of characterizing the topology and elemental composition of the corroded silver surface. In terms of the oil composition, x-ray fluorescence spectroscopy is a very effective method for monitoring total sulfur and copper content. It is anticipated that once corrosive species are identified from the buffer tank samples, it will be possible to target such species in future analyses, allowing the detection of corrosive species at very low concentrations.

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Published date: 2 June 2013
Venue - Dates: INSUCON 2013, International Electrical Insulation Conference, Ottawa, Canada, 2013-06-01 - 2013-06-04
Organisations: EEE

Identifiers

Local EPrints ID: 353271
URI: http://eprints.soton.ac.uk/id/eprint/353271
ISBN: 978-1-4673-4739-6
PURE UUID: 9b8085c4-81e2-49a9-be6a-9c495e47ee95
ORCID for J A Pilgrim: ORCID iD orcid.org/0000-0002-2444-2116
ORCID for P L Lewin: ORCID iD orcid.org/0000-0002-3299-2556
ORCID for R C D Brown: ORCID iD orcid.org/0000-0003-0156-7087

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Date deposited: 03 Jun 2013 20:52
Last modified: 03 Dec 2021 02:35

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Contributors

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

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