Polyethylene Nanocomposites for Power Cable Insulations

Pleșa, Ilona; Notingher, P.; Stancu, Cristina; Wiesbrock, Frank; Schlögl, Sandra

doi:10.3390/polym11010024

Cited by 86 publications

(78 citation statements)

References 252 publications

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“…Yet, the scale‐up of TPE nanocomposites for power cables insulation requires better filler dispersion, understanding the property variation under combined voltage and temperature, the behavior of nanodielectrics to long‐term operation, the manufacture of recyclable materials. [ 86 ]…”

Section: Endeavors To Enhance Dielectric Strengthmentioning

confidence: 99%

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

Tan

2020

J of Applied Polymer Sci

154

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Author Daniel Tan summarized the recent advances in dielectric composites with the focused search for the method of enhancing dielectric strength. A SEM image of the polymer composite is presented showing the nanoparticle dispersion and bonding with polymer matrix via an in-situ polymerization synthesis. The defects, electrical charge transport, surface imperfection causing dielectric breakdown may be suppressed by the adequate design of nanoparticle incorporation, core-shell configuration, and filler-polymer interface, which eventually leads to high performance dielectric nanocomposites for capacitors and electrical insulation.ARTICLES 48192 Microfibrillated-cellulose-reinforced polyester nanocomposites prepared by filtration and hot pressing: Bending properties and three-dimensional formability

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Section: Endeavors To Enhance Dielectric Strengthmentioning

confidence: 99%

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

Tan

2020

J of Applied Polymer Sci

154

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“…In parallel with the development of new HVDC technologies, cable insulations have undergone extensive material development to meet the requirements of increased operating voltage levels, which nowadays reach 640 kV [1][2][3][4]. The choice of materials for insulation of such cables has mainly concentrated on crosslinked polyethylene (XLPE) due to the optimal combination of its electrical insulating performance, thermomechanical properties and chemical stability [5,6]. In the case of power cable applications, the most widely used crosslinking method is peroxide crosslinking using dicumyl peroxide (DCP), where the degree of crosslinking is chosen based on the required electromechanical properties of the material [5].…”

Section: Introductionmentioning

confidence: 99%

Electrical Characterization of a New Crosslinked Copolymer Blend for DC Cable Insulation

Kumara

Hammarström

et al. 2020

Energies

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To design reliable high voltage cables, clean materials with superior insulating properties capable of operating at high electric field levels at elevated temperatures are required. This study aims at the electrical characterization of a byproduct-free crosslinked copolymer blend, which is seen as a promising alternative to conventional peroxide crosslinked polyethylene currently used for high voltage direct current cable insulation. The characterization entails direct current (DC) conductivity, dielectric response and surface potential decay measurements at different temperatures and electric field levels. In order to quantify the insulating performance of the new material, the electrical properties of the copolymer blend are compared with those of two reference materials; i.e., low-density polyethylene (LDPE) and peroxide crosslinked polyethylene (XLPE). It is found that, for electric fields of 10–50 kV/mm and temperatures varying from 30 °C to 70 °C, the DC conductivity of the copolymer blend is in the range of 10−17–10−13 S/m, which is close to the conductivity of crosslinked polyethylene. Furthermore, the loss tangent of the copolymer blend is about three to four times lower than that of crosslinked polyethylene and its magnitude is on the level of 0.01 at 50 °C and 0.12 at 70 °C (measured at 0.1 mHz and 6.66 kV/mm). The apparent conductivity and trap density distributions deduced from surface potential decay measurements also confirmed that the new material has electrical properties at least as good as currently used insulation materials based on XLPE (not byproduct-free). Thus, the proposed byproduct-free crosslinked copolymer blend has a high potential as a prospective insulation medium for extruded high voltage DC cables.

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“…Additionally, an increased elastic modulus [21,22], tensile strength [23] thermal stability [22] and dielectric breakdown strength [15][16][17]24] has been reported. Good reviews on nanocomposites for electrical applications include [6,[25][26][27][28][29][30][31]. One hypothesis for the conductivity reduction in nanocomposites is that electrons and holes are trapped in deep traps in the nanoparticle surface [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Solubility and Diffusivity of Polar and Non-Polar Molecules in Polyethylene-Aluminum Oxide Nanocomposites for HVDC Applications

et al. 2020

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The best commercial high-voltage insulation material of today is (crosslinked) ultra-pure low-density polyethylene (LDPE). A 100-fold decrease in electrical conductivity can be achieved by adding 1–3 wt.% of well-dispersed inorganic nanoparticles to the LDPE. One hypothesis is that the nanoparticle surfaces attract ions and polar molecules, thereby cleaning the surrounding polymer, and thus reducing the conductivity. LDPE-based nanocomposites with 1–12 wt.% octyl-coated aluminum oxide nanoparticles were prepared and the sorption and desorption of one polar compound (acetophenone, a crosslinking by-product) and one non-polar compound of a similar size (limonene) were examined. Since the uptake of acetophenone increased linearly with increasing filler content, whereas the uptake of limonene decreased, the surface attraction hypothesis was strengthened. The analytical functions for predicting composite solubility as a function of particle size and filler fraction were derived using experimental solubility measurements and Monte Carlo simulations.

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Polyethylene Nanocomposites for Power Cable Insulations

Cited by 86 publications

References 252 publications

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

Electrical Characterization of a New Crosslinked Copolymer Blend for DC Cable Insulation

Solubility and Diffusivity of Polar and Non-Polar Molecules in Polyethylene-Aluminum Oxide Nanocomposites for HVDC Applications

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