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Creep Stress Failure in High Voltage Transformer Interwinding Insulation

Creep Stress Failure in High Voltage Transformer Interwinding Insulation
Creep Stress Failure in High Voltage Transformer Interwinding Insulation
Three phase transformers have an insulation system which is a complex three dimensional structure of paper and pressboard surrounding the conductors immersed in a large volume of mineral oil. In core form transformers, a key insulation area is the region between adjacent phases which is often reinforced with vertical pressboard barriers. At the higher voltages, these pressboard barriers provide a crucial element in the insulation structure between the phases. The barriers are subjected to large electrical and thermal stresses. The pressboard barriers sit in the time varying electric field pattern generated from the transformer winding coils which are operating with 120° phase difference. The electric field can be resolved along the surfaces of the pressboard and this is termed creep stress or tangential stress. This electric stress can lead to surface tracking along the oil-pressboard boundary layer. A large scale test facility has been developed to investigate the effects of creep stress with the goal of understanding the onset of surface tracking on the pressboard. This paper details the main features of the test platform and control equipment. Finally, the paper includes some initial results of experiments conducted to detect partial discharge under two temperature conditions.
1-4244-1482-2
572-575
Mitchinson, P M
9de2f4d4-38fb-466b-94c6-c4390a6b2aa8
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Jarman, P N
8e6247bc-f98c-4dac-b150-b7213f2184d5
Mitchinson, P M
9de2f4d4-38fb-466b-94c6-c4390a6b2aa8
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Jarman, P N
8e6247bc-f98c-4dac-b150-b7213f2184d5

Mitchinson, P M, Lewin, P L, Chen, G and Jarman, P N (2007) Creep Stress Failure in High Voltage Transformer Interwinding Insulation. Conference on Electrical Insulation and Dielectric Phenomena, Vancouver, British Columbia, Canada. 13 - 16 Oct 2007. pp. 572-575 .

Record type: Conference or Workshop Item (Paper)

Abstract

Three phase transformers have an insulation system which is a complex three dimensional structure of paper and pressboard surrounding the conductors immersed in a large volume of mineral oil. In core form transformers, a key insulation area is the region between adjacent phases which is often reinforced with vertical pressboard barriers. At the higher voltages, these pressboard barriers provide a crucial element in the insulation structure between the phases. The barriers are subjected to large electrical and thermal stresses. The pressboard barriers sit in the time varying electric field pattern generated from the transformer winding coils which are operating with 120° phase difference. The electric field can be resolved along the surfaces of the pressboard and this is termed creep stress or tangential stress. This electric stress can lead to surface tracking along the oil-pressboard boundary layer. A large scale test facility has been developed to investigate the effects of creep stress with the goal of understanding the onset of surface tracking on the pressboard. This paper details the main features of the test platform and control equipment. Finally, the paper includes some initial results of experiments conducted to detect partial discharge under two temperature conditions.

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More information

Published date: 2007
Additional Information: Event Dates: 14-17 October 2007
Venue - Dates: Conference on Electrical Insulation and Dielectric Phenomena, Vancouver, British Columbia, Canada, 2007-10-13 - 2007-10-16
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 264702
URI: http://eprints.soton.ac.uk/id/eprint/264702
ISBN: 1-4244-1482-2
PURE UUID: 241127d1-7652-401e-900e-cbafec17ba7b

Catalogue record

Date deposited: 19 Oct 2007
Last modified: 06 Oct 2020 23:18

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Contributors

Author: P M Mitchinson
Author: P L Lewin
Author: G Chen
Author: P N Jarman

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