Penetrant diffusion in polyethylene : the impact of water on the performance of novel XLPE cable designs
Penetrant diffusion in polyethylene : the impact of water on the performance of novel XLPE cable designs
Power cables consist of concentric arrangements of layers designed to respond to specific technological requirements. The ambition of the present work is to devise a way to prevent durably the occurrence of detrimental electrical breakdowns induced by the progressive penetration of water within such structures, by the means of studying materials or systems that already are, or could be, integrated into the design of a cable.
Preliminary investigations were directed at evaluating the effect of composition and thermal conditioning on the subsequent morpho-mechanical structure of model materials, which potentially reflect the behaviour of existing LDPE-based insulating materials. This was done prior to investigating water uptake kinetics using the same model materials as above. What was revealed is the considerable influence of additives and thermal processing on the morphology and molecular mobility of such systems. Additionally, such materials exhibit sorption characteristics that were shown to respond to Fickian characteristics.
Afterwards, two materials whose potential applicability to forming water retention layers were probed using ageing methods that ideally reproduce those they would be subjected to, were they incorporated in power cables. One of these two systems is a biomaterial whose water-binding capacities were shown to remain constant, albeit with a propensity to exhibit marked depolymerisation characteristics. The other material is a superabsorbent whose nature was not precisely known, but which nonetheless proved to be as functional as the above biomaterial, from a water-tapping standpoint.
University of Southampton
Barré, Laurent Luc
bec2a7ff-8f97-4d5f-be79-563ef0058ad2
2004
Barré, Laurent Luc
bec2a7ff-8f97-4d5f-be79-563ef0058ad2
Barré, Laurent Luc
(2004)
Penetrant diffusion in polyethylene : the impact of water on the performance of novel XLPE cable designs.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Power cables consist of concentric arrangements of layers designed to respond to specific technological requirements. The ambition of the present work is to devise a way to prevent durably the occurrence of detrimental electrical breakdowns induced by the progressive penetration of water within such structures, by the means of studying materials or systems that already are, or could be, integrated into the design of a cable.
Preliminary investigations were directed at evaluating the effect of composition and thermal conditioning on the subsequent morpho-mechanical structure of model materials, which potentially reflect the behaviour of existing LDPE-based insulating materials. This was done prior to investigating water uptake kinetics using the same model materials as above. What was revealed is the considerable influence of additives and thermal processing on the morphology and molecular mobility of such systems. Additionally, such materials exhibit sorption characteristics that were shown to respond to Fickian characteristics.
Afterwards, two materials whose potential applicability to forming water retention layers were probed using ageing methods that ideally reproduce those they would be subjected to, were they incorporated in power cables. One of these two systems is a biomaterial whose water-binding capacities were shown to remain constant, albeit with a propensity to exhibit marked depolymerisation characteristics. The other material is a superabsorbent whose nature was not precisely known, but which nonetheless proved to be as functional as the above biomaterial, from a water-tapping standpoint.
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Published date: 2004
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Local EPrints ID: 465551
URI: http://eprints.soton.ac.uk/id/eprint/465551
PURE UUID: d27a2ead-b859-4406-bd52-4569cfbf0c5f
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Date deposited: 05 Jul 2022 01:43
Last modified: 16 Mar 2024 20:14
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Author:
Laurent Luc Barré
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