Highly Insulating Polyethylene Blends for High-Voltage Direct-Current Power Cables

Andersson, Mattias; Hynynen, Jonna; Andersson, Mats R.; Englund, Villgot; Hagstrand, P.‐O.; Gkourmpis, Thomas; Müller, Christian

doi:10.1021/acsmacrolett.6b00941

Cited by 79 publications

(67 citation statements)

References 26 publications

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“…Also, the mixing of polymers in small amounts will not change the total crystallinity of the material but lead to distinct changes in the nanostructure. This will result in charge trapping and then reduce the mobility of charge carriers [10].…”

Section: Differential Scanning Calorimetry (Dsc) Resultsmentioning

confidence: 99%

Electrical Properties of Polyethylene/Polypropylene Compounds for High-Voltage Insulation

et al. 2018

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Abstract:In high-voltage insulation systems, the most commonly used material is polymeric material because of its high dielectric strength, high resistivity, and low dielectric loss in addition to good chemical and mechanical properties. In this work, various polymer compounds were prepared, consisting of low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), HDPE/PP, and LDPE/PP polymer blends. The relative permittivity and breakdown strength of each sample types were evaluated. In order to determine the physical properties of the prepared samples, the samples were also characterized using differential scanning calorimetry (DSC). The results showed that the dielectric constant of PP increased with the increase of HDPE and LDPE content. The breakdown measurement data for all samples were analyzed using the cumulative probability plot of Weibull distribution. From the acquired results, it was found that the dielectric strengths of LDPE and HDPE were higher than that of PP. Consequently, the addition of LDPE and HDPE to PP increased the breakdown strength of PP, but a variation in the weight ratio (30%, 50% and 70%) did not change significantly the breakdown strength. The DSC measurements showed two exothermic crystallization peaks representing two crystalline phases. In addition, the DSC results showed that the blended samples were physically bonded, and no co-crystallization occurred in the produced blends.

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Section: Differential Scanning Calorimetry (Dsc) Resultsmentioning

confidence: 99%

Electrical Properties of Polyethylene/Polypropylene Compounds for High-Voltage Insulation

et al. 2018

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“…In literature where the morphology of LDPE specimens for HVDC cable applications have been studied, no banded spherulites are seen in the extruded samples [5]. However, when pellets have been directly compression moulded to plaque specimens banded spherulite morphologies have been observed [14,15].…”

Section: Resultsmentioning

confidence: 99%

“…Especially DC conductivity characterization can be affected by many parameters that may lead to erroneous conclusions, e.g. changes in morphology, oxidation, protective pressing film used during compression moulding, additives and moisture [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

DC Conductivity Measurements of LDPE: Influence of Specimen Preparation Method and Polymer Morphology

Karlsson¹,

Xu²,

Gąska³

et al. 2017

NORD-IS

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DC conductivity measurements are important for gaining fundamental understanding of conduction mechanisms of insulation materials, as well as in the development of HVDC power system components, such as extruded cable systems. In this study, the influence of sample processing on the morphology and DC conductivity of low-density polyethylene (LDPE) has been studied. Direct compression moulding of LDPE pellets is commonly used in research laboratories for obtaining plaque samples, whereas extrusion is an additional commonly used technique for dispersion of particles in nanocomposites prior to the compression moulding process. In this study LDPE plaques have been obtained by either compression moulding directly from pellets, or by extrusion followed by compression moulding. The morphology obtained in the first case consisted of banded spherulites, whereas the latter method yielded a morphology of small axialites. The difference in sample processing had also an impact on the DC conductivity. The DC conductivity at 22 ¡C and 3.3 kV mm -1 was of the order of 4x10 Ð18 S m -1 for the plaques obtained by extrusion and compression moulding whereas the plaques obtained by direct compression moulding exhibited a conductivity of 1x10 Ð16 S m -1 . In addition, the reproducibility of the performed DC conductivity measurements was also verified in a round robin test performed between the Royal Institute of Technology and Chalmers Technical University.

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“…The samples were cooled down in liquid nitrogen and then fractured. Thereafter all samples were etched for one hour using solution of 1wt% potassium permanganate in a mixture of sulfuric acid, ortho-phosphoric acid and water [3]. The process was stopped by washing in a mixture of sulfuric acid and water, thereafter in hydrogen peroxide and finally in isopropanol.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Influence of manufacturing process on electrical properties of LDPE-GnP nanocomposites

Gąska¹,

Xu²,

Kádár³

et al. 2017

NORD-IS

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In this report electrical properties of the nanocomposite samples, prepared from graphene nanoplatelet (GnP) loaded low density polyethylene (LDPE) by extrusion and compression molding, were examined in order to elucidate the impacts of the nanoplatelets size and material's manufacturing process. It is shown that the extrusion forces a strong anisotropy in material's morphology. The graphene nanoplatelets become aligned along the flow direction. As compared to pure LDPE, a significant reductions of the through-plane low field electric conductivity is found in such samples. On the other hand, the samples produced by press molding exhibit slightly higher level of electric conductivity, which is connected to their less aligned microstructure and filler dispersion. For comparison results of measurements on LDPE-graphene monolayer sandwiches are also presented.

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Highly Insulating Polyethylene Blends for High-Voltage Direct-Current Power Cables

Cited by 79 publications

References 26 publications

Electrical Properties of Polyethylene/Polypropylene Compounds for High-Voltage Insulation

Electrical Properties of Polyethylene/Polypropylene Compounds for High-Voltage Insulation

DC Conductivity Measurements of LDPE: Influence of Specimen Preparation Method and Polymer Morphology

Influence of manufacturing process on electrical properties of LDPE-GnP nanocomposites

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