The University of Southampton
University of Southampton Institutional Repository

Electric Field Interaction in the Inter-Phase Region of Transformers

Electric Field Interaction in the Inter-Phase Region of Transformers
Electric Field Interaction in the Inter-Phase Region of Transformers
Large three-phase power transformers normally consist of three cylindrical coil sets (phase windings) assembled side by side in line. The high voltage winding of each phase is generally the outermost coil. The space between the phase windings is called the inter-phase region. Insulating sheets of pressboard, are placed between the phase windings to form dielectric barriers to prevent flashover between the phases. The insulation design is often a multi-layer arrangement of boards and oil gaps. A small number of transformers have been affected by the phenomenon of creeping discharge on the surface of the pressboard barriers. The mechanism of this phenomenon is not well understood. The paper describes the test facility which has been developed to model the inter-phase barrier region. Two independent electric fields are used to re-create the electric field profile in the barrier region. A discharge source is introduced into the resultant electric field and applied onto the pressboard surface to explore the effect of the electric field, both along and perpendicular to the barrier, on the discharge. Initial results show that the magnitude and density of discharge is affected by the phase relationship between the interacting fields.
978-1-4244-3917-1
138-141
Mitchinson, P M
9de2f4d4-38fb-466b-94c6-c4390a6b2aa8
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Jarman, P N
8e6247bc-f98c-4dac-b150-b7213f2184d5
Mitchinson, P M
9de2f4d4-38fb-466b-94c6-c4390a6b2aa8
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Jarman, P N
8e6247bc-f98c-4dac-b150-b7213f2184d5

Mitchinson, P M, Lewin, P L and Jarman, P N (2009) Electric Field Interaction in the Inter-Phase Region of Transformers. 2009 IEEE Electrical Insulation Conference, Canada. 31 May - 03 Jun 2009. pp. 138-141 .

Record type: Conference or Workshop Item (Paper)

Abstract

Large three-phase power transformers normally consist of three cylindrical coil sets (phase windings) assembled side by side in line. The high voltage winding of each phase is generally the outermost coil. The space between the phase windings is called the inter-phase region. Insulating sheets of pressboard, are placed between the phase windings to form dielectric barriers to prevent flashover between the phases. The insulation design is often a multi-layer arrangement of boards and oil gaps. A small number of transformers have been affected by the phenomenon of creeping discharge on the surface of the pressboard barriers. The mechanism of this phenomenon is not well understood. The paper describes the test facility which has been developed to model the inter-phase barrier region. Two independent electric fields are used to re-create the electric field profile in the barrier region. A discharge source is introduced into the resultant electric field and applied onto the pressboard surface to explore the effect of the electric field, both along and perpendicular to the barrier, on the discharge. Initial results show that the magnitude and density of discharge is affected by the phase relationship between the interacting fields.

Text
EIC_Mark_M.pdf - Version of Record
Restricted to Registered users only
Download (1MB)
Request a copy

More information

Published date: 31 May 2009
Additional Information: Event Dates: 31 May - 3 June 2009
Venue - Dates: 2009 IEEE Electrical Insulation Conference, Canada, 2009-05-31 - 2009-06-03
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 267558
URI: https://eprints.soton.ac.uk/id/eprint/267558
ISBN: 978-1-4244-3917-1
PURE UUID: d5f22f98-248f-4e0d-8da9-0a0e9f6ceb77

Catalogue record

Date deposited: 12 Jun 2009 15:59
Last modified: 09 Dec 2019 20:11

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×