Comportamento dielétrico, viscoelástico e físico-químico do polietileno reticulado envelhecido sob condições aceleradas de múltiplo estresse

Leguenza, E.L.

doi:10.11606/t.76.2003.tde-09042008-093654

Cited by 2 publications

(15 citation statements)

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“…Brand new pieces of coaxial XLPE cables used in underground distribution of electrical energy, about, 15 kV rated, were aged in laboratory for 500 and 1000 hours using the setup under multi-stressing conditions [3]. The aging process was carried out by immersing cable samples in a specially designed steel chamber containing NaCl IM and distilled water at RT [3].…”

Section: Methodsmentioning

confidence: 99%

“…The aging process was carried out by immersing cable samples in a specially designed steel chamber containing NaCl IM and distilled water at RT [3]. The AC voltage with amplitude of 10 kV was applied to the XLPE cable samples, frequency of I kHz at room temperature (RT).…”

Section: Methodsmentioning

confidence: 99%

“…Foil samples approximately 150 ?m thick were radially peeled from different depths from the cable pieces using a specially designed microtome as described before [3]. Three set of samples were produced: the first, the samples were taken just below the surface of the external semiconductor layer (outer layer), the second, taken in the middle of the XLPE insulator (middle layer) and, the third, taken just above the internal semiconductor layer (inner layer).…”

Section: Methodsmentioning

confidence: 99%

“…Three set of samples were produced: the first, the samples were taken just below the surface of the external semiconductor layer (outer layer), the second, taken in the middle of the XLPE insulator (middle layer) and, the third, taken just above the internal semiconductor layer (inner layer). Aluminum electrodes with 35 mm in diameter, vacuum evaporated on both sides of all samples, were employed for dielectric measurements made in a stainless steel chamber [3,4].…”

Section: Methodsmentioning

confidence: 99%

“…At very low frequency range from 10 ? Hz to 50 mHz dielectric data was determined using the Hamon procedure [3,4]. A DC step voltage (electric field of 2 kV/mm) was applied using a 6521 A-HP power supply and the discharging current measured with a 617-Keithley electrometer.…”

Section: Methodsmentioning

confidence: 99%

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Dielectric Behavior of XLPE Aged Under Multi-Stressing Conditions

Leguenza

Robert²,

Moura³

et al.

2005 12th International Symposium on Electrets

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In this work fresh cables were laboratory aged under multi-stressing conditions at room temperature. Foils were peeled from cables, with approximately 150 ?m thickness, from the outer, middle and inner positions of the XLPE cable insulating layer. For samples obtained from the outer cable layer position, an increasing near-permanent electrical conduction process with aging time was observed. At the middle and inner cable layer positions a flat-loss relaxation process was observed becoming a dominating process on the ageing. In addition, PEA results confirmed that degradation in the outer region of the XLPE cables arises from the simultaneous presence of dipoles and injected space charge that distorts the internal electric field on the ageing.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Dielectric Behavior of XLPE Aged Under Multi-Stressing Conditions

Leguenza

Robert²,

Moura³

et al.

2005 12th International Symposium on Electrets

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Compatibilização de blenda polimérica de poliamida 6,6/ polietileno de baixa densidade utilizando radiação ionizante de feixe de elétrons

Feitosa¹

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The plastic industry has recognized that mixture of polymers, called polymeric blends, yields new materials with improve properties and better features of those of the polymer blended. In most of the cases, blends are formed by immiscible components presenting separated phases, micro-structures or morphologies. One of the main factors for good mechanical performance is the interfacial adhesion of the blend components. The improvement of miscibility between the polymer components and the enhancement of blend performance is denominated of compatibilization. This compatibilization can be achieved by chemical methods or using ionizing radiation. The present work has as a main objective the study of the effect of the ionizing radiation from electron beam in the compatibilization of the polyamide (PA) 6.6 and low density polyethylene (LDPE) 75%/25% wt blend, in the range of applied doses from 50 to 250 kGy. The compatibilization effect was evaluated by mechanical test, which has shown improvement in the tensile strength and hardness properties and a reduction of the impact resistant. This mechanical behavior can be considered as a combination effect of the cross-linking, induced in the molecular structure on the polymers, and the increase of the miscibility of the blend components. The degree of compatibilization was evaluated by the behavior of the glass transition temperatures (T g) for the blend components obtained by dynamic mechanical analysis (DMA) measurements. The results have shown that the values of T g for PA 6.6 and LDPE get near by 8 o C, showing that the ionizing radiation have promoted a compatibilization effect on the irradiated blend.

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Comportamento dielétrico, viscoelástico e físico-químico do polietileno reticulado envelhecido sob condições aceleradas de múltiplo estresse

Cited by 2 publications

References 0 publications

Dielectric Behavior of XLPE Aged Under Multi-Stressing Conditions

Dielectric Behavior of XLPE Aged Under Multi-Stressing Conditions

Compatibilização de blenda polimérica de poliamida 6,6/ polietileno de baixa densidade utilizando radiação ionizante de feixe de elétrons

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