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Effects of aging on the mechanical and dielectric properties of transformer grade Kraft paper

Effects of aging on the mechanical and dielectric properties of transformer grade Kraft paper
Effects of aging on the mechanical and dielectric properties of transformer grade Kraft paper
In order to understand the aging process of paper used in high voltage transformers, transformer grade Kraft paper samples were aged in a fan oven in order to access the full range of DP values from 1100 (new) to ~200 (end of life). The absence of significant oxidation was verified by infrared spectroscopy and the mechanical and dielectric properties were assessed as a function of DP. Whilst the dielectric properties (in the absence of water) were unaffected by aging, the tensile strength was reduced. This confirms studies in the literature which show that most transformer breakdowns occur through mechanical failure of the paper and crucially, provides a mechanism of providing paper samples of known DP for subsequent exposure to oil flow.
Transformer Insulation, Ageing, DP
IEEE
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Pilgrim, James
4b4f7933-1cd8-474f-bf69-39cefc376ab7
Wilson, G
25fbd90e-6949-481c-9e75-0d457003c839
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Pilgrim, James
4b4f7933-1cd8-474f-bf69-39cefc376ab7
Wilson, G
25fbd90e-6949-481c-9e75-0d457003c839

Hosier, Ian, Lewin, Paul, Pilgrim, James and Wilson, G (2020) Effects of aging on the mechanical and dielectric properties of transformer grade Kraft paper. In Proceedings of 2020 Electrical Insulation Conference. IEEE. 4 pp . (In Press)

Record type: Conference or Workshop Item (Paper)

Abstract

In order to understand the aging process of paper used in high voltage transformers, transformer grade Kraft paper samples were aged in a fan oven in order to access the full range of DP values from 1100 (new) to ~200 (end of life). The absence of significant oxidation was verified by infrared spectroscopy and the mechanical and dielectric properties were assessed as a function of DP. Whilst the dielectric properties (in the absence of water) were unaffected by aging, the tensile strength was reduced. This confirms studies in the literature which show that most transformer breakdowns occur through mechanical failure of the paper and crucially, provides a mechanism of providing paper samples of known DP for subsequent exposure to oil flow.

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2141 Effects of Aging Hosier - Accepted Manuscript
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More information

Accepted/In Press date: 5 July 2020
Venue - Dates: 2020 Electrical Insulation Conference, Virtual Conference,, 2020-06-22 - 2020-07-05
Keywords: Transformer Insulation, Ageing, DP

Identifiers

Local EPrints ID: 442462
URI: http://eprints.soton.ac.uk/id/eprint/442462
PURE UUID: 6ad461b0-0784-42fc-8cc2-9346961107da
ORCID for Ian Hosier: ORCID iD orcid.org/0000-0003-4365-9385
ORCID for James Pilgrim: ORCID iD orcid.org/0000-0002-2444-2116

Catalogue record

Date deposited: 15 Jul 2020 16:42
Last modified: 18 Feb 2021 17:02

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