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Ageing and recovery of silicone rubber insulation

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dc.contributor.advisor Jandrell IR en
dc.contributor.author Reynders SM en
dc.date.accessioned 2016-09-22T11:18:08Z
dc.date.available 2016-09-22T11:18:08Z
dc.date.submitted 1998 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/109428
dc.description.abstract This paper presents experimental work on corona ageing of silicone rubber insulation. Samples were aged for periods ranging from 1 minute to 27 days and recovery was monitored over long periods of up to 3.7 months. The ageing was thermally accelerated at temperatures ranging from 25�C to 100�C. Ageing and recovery were quantified using contact angle measurements and X-Ray Photoelectron Spectroscopy - surface and depth profile chemical analysis. <br><br> A large volume of contact angle data has been reported on. Observations showed complete recovery, provided a sufficient resting period was allowed. Recovery time constants varied considerably from 1 hour to 150 hours. Slowest recovery was obtained after ageing at 50� C. Chemical analysis reveals that permanent ageing is present in terms of a loss of silicone polymer immediately below the surface layers. Theories on low molecular weight (LMW) diffusion and regeneration are confirmed and hydrophobicity of recovered samples is shown to be a superficial property. From a review of silicone rubber research, as well as that conducted by the author, a 15 stage model has been compiled explaining the individual processes that occur under-operational conditions resulting in eventual failure and destruction of insulators. en
dc.language English en
dc.title Ageing and recovery of silicone rubber insulation en
dc.type Masters degree en
dc.description.degree MSc (Elec Eng) en


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