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X-ray fluorescence as a condition monitoring tool for copper and corrosive sulphur species in insulating oil

X-ray fluorescence as a condition monitoring tool for copper and corrosive sulphur species in insulating oil
X-ray fluorescence as a condition monitoring tool for copper and corrosive sulphur species in insulating oil
Currently there are no standard techniques to detect copper sulphide deposits in transformers to act as an early warning system. This paper develops and tests a procedure using X-Ray Fluorescence (XRF) spectroscopy to tackle this problem and to monitor dissolved copper in oil, which can have a major impact on the dielectric properties of insulating oil. Initially calibration curves for sulphur and copper demonstrate the XRF’s limits of quantitation. Subsequently, a laboratory scale sample preparation procedure is developed to demonstrate that corrosive sulphur depletion trends may indirectly monitor copper sulphide formation. To confirm depleting sulphur species are corroding copper samples are analysed with Energy Dispersive X-Ray spectroscopy. Finally XRF demonstrates that corrosive oil has a low impact on the long term concentration of copper in oil. An XRF condition monitoring technique feasibility study is conducted and recommendations are given in how to implement it in the field.
Copper, corrosion, corrosion testing, sulfur, sulfur compounds, transformers, transformer windings, oil insulation.
1070-9878
701-708
Amaro, P.S.
09096f1c-3840-48a7-a65d-d734ff70c88c
Facciotti, M.
3c5dd179-8124-4d79-99b2-faa2aa37e96f
Holt, A.F.
6a6195df-03d6-4174-a504-8ca2965e52df
Pilgrim, James
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Lewin, P.L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Brown, R.C.D.
21ce697a-7c3a-480e-919f-429a3d8550f5
Wilson, G.
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Jarman, P.
390aafbd-393e-4e20-bace-b4416e0dd456
Amaro, P.S.
09096f1c-3840-48a7-a65d-d734ff70c88c
Facciotti, M.
3c5dd179-8124-4d79-99b2-faa2aa37e96f
Holt, A.F.
6a6195df-03d6-4174-a504-8ca2965e52df
Pilgrim, James
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.
390aafbd-393e-4e20-bace-b4416e0dd456

Amaro, P.S., Facciotti, M., Holt, A.F., Pilgrim, James, Lewin, P.L., Brown, R.C.D., Wilson, G. and Jarman, P. (2015) X-ray fluorescence as a condition monitoring tool for copper and corrosive sulphur species in insulating oil. IEEE Transactions on Dielectrics & Electrical Insulation, 22 (2), 701-708. (doi:10.1109/TDEI.2015.7076765).

Record type: Article

Abstract

Currently there are no standard techniques to detect copper sulphide deposits in transformers to act as an early warning system. This paper develops and tests a procedure using X-Ray Fluorescence (XRF) spectroscopy to tackle this problem and to monitor dissolved copper in oil, which can have a major impact on the dielectric properties of insulating oil. Initially calibration curves for sulphur and copper demonstrate the XRF’s limits of quantitation. Subsequently, a laboratory scale sample preparation procedure is developed to demonstrate that corrosive sulphur depletion trends may indirectly monitor copper sulphide formation. To confirm depleting sulphur species are corroding copper samples are analysed with Energy Dispersive X-Ray spectroscopy. Finally XRF demonstrates that corrosive oil has a low impact on the long term concentration of copper in oil. An XRF condition monitoring technique feasibility study is conducted and recommendations are given in how to implement it in the field.

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Accepted/In Press date: 31 August 2014
Published date: 9 April 2015
Keywords: Copper, corrosion, corrosion testing, sulfur, sulfur compounds, transformers, transformer windings, oil insulation.
Organisations: EEE

Identifiers

Local EPrints ID: 376353
URI: http://eprints.soton.ac.uk/id/eprint/376353
ISSN: 1070-9878
PURE UUID: 73522566-5dc4-4638-b71c-0f5d2c558bdc
ORCID for James Pilgrim: ORCID iD orcid.org/0000-0002-2444-2116
ORCID for R.C.D. Brown: ORCID iD orcid.org/0000-0003-0156-7087

Catalogue record

Date deposited: 17 Apr 2015 14:16
Last modified: 29 Oct 2019 02:03

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Contributors

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

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