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Transformer Oil Passivation and Impact of Corrosive Sulphur

Transformer Oil Passivation and Impact of Corrosive Sulphur
Transformer Oil Passivation and Impact of Corrosive Sulphur
In recent years a significant volume of research has been undertaken in order to understand the recent failures in oil insulated power apparatus due to deposition of copper sulphide on the conductors and in the insulation paper. Dibenzyl Disulfide (DBDS) has been found to be the leading corrosive sulphur compound in the insulation oil [1]. The process of copper sulphide formation and the deposition in the paper is still being investigated, but a recently proposed method seems to be gaining some confidence [1]. This method suggests a two-step process; initially the DBDS and some oil soluble copper complexes are formed. Secondly the copper complexes are absorbed in the paper insulation, where they then decompose into copper sulphide [2]. The most commonly used mitigating technique for corrosive sulphur contaminated oil is passivation, normally using Irgamet 39 or 1, 2, 3-benzotriazole (BTA). The passivator is diluted into the oil to a concentration of around 100ppm, where it then reacts with the copper conductors to form a complex layer around the copper, preventing it from interacting with DBDS compounds and forming copper sulphide. This research project will investigate the electrical properties of HV transformers which have tested positive for corrosive sulphur, and the evolution of those properties as the asset degrades due to sulphur corrosion. Parallel to this the long term properties of transformers with passivated insulation oil will be analysed in order to understand the passivator stability and whether it is necessary to keep adding the passivator to sustain its performance. Condition monitoring techniques under investigation will include dielectric spectroscopy, frequency response analysis, recovery voltage method (aka interfacial polarisation) amongst others. Partial discharge techniques will not be investigated, as the voltage between the coil plates is low and therefore it will not contribute significantly to the overall insulation breakdown, in corrosive oil related faults [3]. The goal of this research is to establish key electrical properties in both passivated and non-passivated power transformers that demonstrate detectable changes as the equipment degrades due to the insulation oil being corrosive.
11
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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Amaro, P S
09096f1c-3840-48a7-a65d-d734ff70c88c
Pilgrim, J A
4b4f7933-1cd8-474f-bf69-39cefc376ab7
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Brown, R C D
3f268f46-b52b-469f-ad63-801913350252
Wilson, G
25fbd90e-6949-481c-9e75-0d457003c839
Jarman, P N
8e6247bc-f98c-4dac-b150-b7213f2184d5

Amaro, P S, Pilgrim, J A, Lewin, P L, Brown, R C D, Wilson, G and Jarman, P N (2012) Transformer Oil Passivation and Impact of Corrosive Sulphur. The Fifth UHVnet Colloquium, United Kingdom. 18 - 19 Jan 2012. p. 11 .

Record type: Conference or Workshop Item (Paper)

Abstract

In recent years a significant volume of research has been undertaken in order to understand the recent failures in oil insulated power apparatus due to deposition of copper sulphide on the conductors and in the insulation paper. Dibenzyl Disulfide (DBDS) has been found to be the leading corrosive sulphur compound in the insulation oil [1]. The process of copper sulphide formation and the deposition in the paper is still being investigated, but a recently proposed method seems to be gaining some confidence [1]. This method suggests a two-step process; initially the DBDS and some oil soluble copper complexes are formed. Secondly the copper complexes are absorbed in the paper insulation, where they then decompose into copper sulphide [2]. The most commonly used mitigating technique for corrosive sulphur contaminated oil is passivation, normally using Irgamet 39 or 1, 2, 3-benzotriazole (BTA). The passivator is diluted into the oil to a concentration of around 100ppm, where it then reacts with the copper conductors to form a complex layer around the copper, preventing it from interacting with DBDS compounds and forming copper sulphide. This research project will investigate the electrical properties of HV transformers which have tested positive for corrosive sulphur, and the evolution of those properties as the asset degrades due to sulphur corrosion. Parallel to this the long term properties of transformers with passivated insulation oil will be analysed in order to understand the passivator stability and whether it is necessary to keep adding the passivator to sustain its performance. Condition monitoring techniques under investigation will include dielectric spectroscopy, frequency response analysis, recovery voltage method (aka interfacial polarisation) amongst others. Partial discharge techniques will not be investigated, as the voltage between the coil plates is low and therefore it will not contribute significantly to the overall insulation breakdown, in corrosive oil related faults [3]. The goal of this research is to establish key electrical properties in both passivated and non-passivated power transformers that demonstrate detectable changes as the equipment degrades due to the insulation oil being corrosive.

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More information

Published date: 18 January 2012
Additional Information: Event Dates: 18-19 January 2012
Venue - Dates: The Fifth UHVnet Colloquium, United Kingdom, 2012-01-18 - 2012-01-19
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 273124
URI: https://eprints.soton.ac.uk/id/eprint/273124
PURE UUID: 027c57f3-d350-485e-b536-7529d1fac557
ORCID for J A Pilgrim: ORCID iD orcid.org/0000-0002-2444-2116

Catalogue record

Date deposited: 20 Jan 2012 14:30
Last modified: 14 Dec 2018 01:34

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Contributors

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

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