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Investigating the Physiochemical Effects of Verdigris Contamination found on a Polymeric Cable Sealing End

Investigating the Physiochemical Effects of Verdigris Contamination found on a Polymeric Cable Sealing End
Investigating the Physiochemical Effects of Verdigris Contamination found on a Polymeric Cable Sealing End
A cable sealing end is a crucial power system component as it is responsible for the vital task of successfully terminating cables. Recent reports on the diagnosis of ex-service units have led us to investigate possible contaminations that could impact the dielectric properties of a cable sealing end. Verdigris, often blue/green in color, is one such contaminant that is observed on the surface of a cable stalk. This investigation aims to understand the possible cause of this contamination and its impact on the dielectric liquid used inside a polymeric cable sealing end. To achieve this, the current study is devised in two parts. First, a sample of the verdigris is scraped off from the cable stalk surface and analyzed. The elemental composition of the blue verdigris is analyzed using energy-dispersive X-ray methods on a scanning electron microscope. Second, sonication ageing tests are performed on samples of silicone oil that have been contaminated with verdigris. Elemental analysis shows traces of carbon, oxygen, sodium, silicon, tin and copper contaminations as the primary components of the verdigris present in different percentage. The results from the second half of the study obtained shows an increment in dielectric permittivity and moisture measurements, whereas not much change was reflected in the UV-vis analysis when compared with fresh oil sample.
Thakur, Soumya
49dabff4-9e32-4d03-a435-c2c1cdd32b05
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Shaw, Allison
5458a2f6-94f7-44b2-8062-b72d2891cf6f
Cwikowski, Oliver
ddb7547b-f9b5-48d6-9c2f-f7f332e0495d
Thakur, Soumya
49dabff4-9e32-4d03-a435-c2c1cdd32b05
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Shaw, Allison
5458a2f6-94f7-44b2-8062-b72d2891cf6f
Cwikowski, Oliver
ddb7547b-f9b5-48d6-9c2f-f7f332e0495d

Thakur, Soumya, Andritsch, Thomas, Lewin, Paul, Shaw, Allison and Cwikowski, Oliver (2021) Investigating the Physiochemical Effects of Verdigris Contamination found on a Polymeric Cable Sealing End. Electrical Insulation Conference, virtual event. 07 - 28 Jun 2021. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

A cable sealing end is a crucial power system component as it is responsible for the vital task of successfully terminating cables. Recent reports on the diagnosis of ex-service units have led us to investigate possible contaminations that could impact the dielectric properties of a cable sealing end. Verdigris, often blue/green in color, is one such contaminant that is observed on the surface of a cable stalk. This investigation aims to understand the possible cause of this contamination and its impact on the dielectric liquid used inside a polymeric cable sealing end. To achieve this, the current study is devised in two parts. First, a sample of the verdigris is scraped off from the cable stalk surface and analyzed. The elemental composition of the blue verdigris is analyzed using energy-dispersive X-ray methods on a scanning electron microscope. Second, sonication ageing tests are performed on samples of silicone oil that have been contaminated with verdigris. Elemental analysis shows traces of carbon, oxygen, sodium, silicon, tin and copper contaminations as the primary components of the verdigris present in different percentage. The results from the second half of the study obtained shows an increment in dielectric permittivity and moisture measurements, whereas not much change was reflected in the UV-vis analysis when compared with fresh oil sample.

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Published date: 7 June 2021
Venue - Dates: Electrical Insulation Conference, virtual event, 2021-06-07 - 2021-06-28

Identifiers

Local EPrints ID: 449753
URI: http://eprints.soton.ac.uk/id/eprint/449753
PURE UUID: 87aedeed-eaca-4b6c-9769-4f68c0858214
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

Catalogue record

Date deposited: 15 Jun 2021 16:33
Last modified: 16 Jun 2021 01:45

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Contributors

Author: Soumya Thakur
Author: Thomas Andritsch ORCID iD
Author: Paul Lewin
Author: Allison Shaw
Author: Oliver Cwikowski

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