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A Method for the Measurement of Leakage Current due to Surface Discharge at the Oil-pressboard Interface

A Method for the Measurement of Leakage Current due to Surface Discharge at the Oil-pressboard Interface
A Method for the Measurement of Leakage Current due to Surface Discharge at the Oil-pressboard Interface
Surface tracking is the conducting path formed on the surface of an insulation material as a result of surface currents. Tracking has commonly been associated with solid insulation in air such as overhead line insulators but is now recognized to occur at the oil-pressboard insulation interface inside large transformers. The surface current is effectively the drift of charge under the action of an electric field which may be either the general electric field or a locally enhanced field developed around a space charge. A needle-bar configuration has been developed to promote surface tracking under controlled conditions at the oil-pressboard interface without surface flashover or breakdown. This method is used to study the leakage current associated with surface discharge applied from a high voltage source on the oil-pressboard interface. This paper outlines the experimental set-up and presents results which compare the measured current against the corresponding partial discharges. Subsequently a mechanism describing the process by which leakage current is formed is proposed.
978-1-4577-0276-1
41-44
Zainuddin, H
c9e0665b-ea0b-4a65-9f53-49d90f66cd8c
Mitchinson, P M
9de2f4d4-38fb-466b-94c6-c4390a6b2aa8
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Zainuddin, H
c9e0665b-ea0b-4a65-9f53-49d90f66cd8c
Mitchinson, P M
9de2f4d4-38fb-466b-94c6-c4390a6b2aa8
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

Zainuddin, H, Mitchinson, P M and Lewin, P L (2011) A Method for the Measurement of Leakage Current due to Surface Discharge at the Oil-pressboard Interface. IEEE 2011 Electrical Insulation Conference, Annapolis, Maryland, United States. 04 - 07 Jun 2011. pp. 41-44 .

Record type: Conference or Workshop Item (Paper)

Abstract

Surface tracking is the conducting path formed on the surface of an insulation material as a result of surface currents. Tracking has commonly been associated with solid insulation in air such as overhead line insulators but is now recognized to occur at the oil-pressboard insulation interface inside large transformers. The surface current is effectively the drift of charge under the action of an electric field which may be either the general electric field or a locally enhanced field developed around a space charge. A needle-bar configuration has been developed to promote surface tracking under controlled conditions at the oil-pressboard interface without surface flashover or breakdown. This method is used to study the leakage current associated with surface discharge applied from a high voltage source on the oil-pressboard interface. This paper outlines the experimental set-up and presents results which compare the measured current against the corresponding partial discharges. Subsequently a mechanism describing the process by which leakage current is formed is proposed.

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More information

Published date: 5 June 2011
Additional Information: Event Dates: 5 - 8 June 2011
Venue - Dates: IEEE 2011 Electrical Insulation Conference, Annapolis, Maryland, United States, 2011-06-04 - 2011-06-07
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 272415
URI: http://eprints.soton.ac.uk/id/eprint/272415
ISBN: 978-1-4577-0276-1
PURE UUID: 90c3cc25-7164-4e59-b8e0-2d8ac3a67eff

Catalogue record

Date deposited: 06 Jun 2011 14:28
Last modified: 20 Nov 2021 11:03

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Contributors

Author: H Zainuddin
Author: P M Mitchinson
Author: P L Lewin

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