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Degradation Behaviour of Solid Insulation Under Cryogenic Conditions

Degradation Behaviour of Solid Insulation Under Cryogenic Conditions
Degradation Behaviour of Solid Insulation Under Cryogenic Conditions
The increasing applications of High Temperature Superconductors (HTS) require the understanding of dielectric behavior at cryogenic temperature. Liquid dielectrics such as liquid nitrogen (LN2) have the ability to recover after discharges provided that efficient cooling is available. However, partial discharge streamers during the pre-breakdown phenomena in LN2 can significantly erode solid insulation. This damage is irreversible and degrades the solid dielectric, therefore, affecting the reliability of the insulation system. The paper investigates the erosion phenomena of cryogenic solid dielectrics caused by partial discharges in LN2 under AC applied voltages. The experiment set-up consists of a sharp tungsten point and a solid insulation barrier on top of a planar electrode. The materials investigated were polytetrafluoroethylene (PTFE) and glass fiber reinforced plastic (GRP). Partial discharges were measured during the tests following IEC 60720 standard and streamer channels were recorded using a high speed camera. Different erosion behavior was found for the two types of materials under study. Damage to the PTFE samples appeared only on the surface while erosion of GRP sample was found in form of a hole of which depth increased over time.
978-1-4673-4459-3
640-643
Truong, L H
a52e7edc-a28b-4a9c-ac7b-9251d45bb769
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Truong, L H
a52e7edc-a28b-4a9c-ac7b-9251d45bb769
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

Truong, L H and Lewin, P L (2013) Degradation Behaviour of Solid Insulation Under Cryogenic Conditions. IEEE 2013 International Conference on Solid Dielectrics (ICSD), , Bologna, Italy. 29 Jun - 03 Jul 2013. pp. 640-643 .

Record type: Conference or Workshop Item (Paper)

Abstract

The increasing applications of High Temperature Superconductors (HTS) require the understanding of dielectric behavior at cryogenic temperature. Liquid dielectrics such as liquid nitrogen (LN2) have the ability to recover after discharges provided that efficient cooling is available. However, partial discharge streamers during the pre-breakdown phenomena in LN2 can significantly erode solid insulation. This damage is irreversible and degrades the solid dielectric, therefore, affecting the reliability of the insulation system. The paper investigates the erosion phenomena of cryogenic solid dielectrics caused by partial discharges in LN2 under AC applied voltages. The experiment set-up consists of a sharp tungsten point and a solid insulation barrier on top of a planar electrode. The materials investigated were polytetrafluoroethylene (PTFE) and glass fiber reinforced plastic (GRP). Partial discharges were measured during the tests following IEC 60720 standard and streamer channels were recorded using a high speed camera. Different erosion behavior was found for the two types of materials under study. Damage to the PTFE samples appeared only on the surface while erosion of GRP sample was found in form of a hole of which depth increased over time.

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Published date: 30 June 2013
Venue - Dates: IEEE 2013 International Conference on Solid Dielectrics (ICSD), , Bologna, Italy, 2013-06-29 - 2013-07-03
Organisations: EEE

Identifiers

Local EPrints ID: 354564
URI: http://eprints.soton.ac.uk/id/eprint/354564
ISBN: 978-1-4673-4459-3
PURE UUID: 1ba8170a-7d6c-4603-bfd4-dea3d1e7a376

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Date deposited: 12 Jul 2013 15:48
Last modified: 20 Nov 2021 15:08

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Contributors

Author: L H Truong
Author: P L Lewin

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