Stress controlling semiconductive shields in medium voltage power distribution cables

Burns, N.M.; Eichhorn, R. M.; Reid, Crawford

doi:10.1109/57.156940

Cited by 32 publications

(18 citation statements)

References 8 publications

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“…LLDPE was chosen over other types of polyethylene (PE) due to a melting point close to that of EVA, which is an advantage in industrial manufacturing, and also because its composites with GN already showed lower percolation threshold than those based on high‐density polyethylene (HDPE) . This type of material has potential applications in power cables, particularly as a semi‐conductive screen material between the conductor and the insulating layer, and in other electronic devices for electrostatic dissipation . Surface energy concepts were used to determine the equilibrium location of graphene in this system while rheological measurements were used to design the blend morphology.…”

Section: Introductionmentioning

confidence: 99%

The Role of Selectively Located Commercial Graphene Nanoplatelets in the Electrical Properties, Morphology, and Stability of EVA/LLDPE Blends

Kurusu

Helal

Moghimian

et al. 2018

Macro Materials & Eng

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Graphene nanoplatelets (GN) produced on a large scale by mechanochemical exfoliation of graphite are incorporated in a co‐continuous ethylene‐vinyl acetate/linear low‐density polyethylene (EVA/LLDPE) blend. Two different processing routes are chosen to selectively place GN in the EVA phase or force its migration to the EVA/LLDPE interface. The results show a drastic decrease in the electrical percolation threshold when the blends are compared to the respective single‐polymer composites. Even with the presence of agglomerates, GN particles are able to migrate to the blend interface and stabilize the morphology and hence the electrical properties. Annealing the insulating samples at processing temperatures causes a drastic increase in conductivity due to continued GN migration and blend morphology coarsening. Semi‐conductive samples, in which a more robust GN network is already established during processing, present no change in morphology but a slight increase in conductivity during annealing. The mechanical performance of the materials is also evaluated and some of the blends with GN present similar elongation at break as pure EVA, but with increased tensile modulus and tensile strength. The electrical performance at different working temperatures shows that the EVA/LLDPE/GN composites are good candidates to act as a semi‐conductive screen material in power cables or as anti‐static materials in electronic devices.

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Section: Introductionmentioning

confidence: 99%

The Role of Selectively Located Commercial Graphene Nanoplatelets in the Electrical Properties, Morphology, and Stability of EVA/LLDPE Blends

Kurusu

Helal

Moghimian

et al. 2018

Macro Materials & Eng

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“…The exfoliated sheets of GO can be reduced into graphene in different ways: chemically, electrochemically, or thermally. 25,26 To date, conductivity modulation is achieved by doping insulating polymers with a relatively large amount of micrometer-size carbon black (up to 30 wt %). [10][11][12] One of the main drawbacks is that these processes, altering the hydro-philic character of GO, increases its tendency to agglomerate irreversibly.…”

Section: Introductionmentioning

confidence: 99%

Electrical ac and dc behavior of epoxy nanocomposites containing graphene oxide

Mancinelli

Fabiani

Saccani³

et al. 2015

J of Applied Polymer Sci

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This article deals with the investigation of electrical properties of epoxy-based nanocomposites containing graphene oxide nanofillers dispersed in the polymer matrix through two-phase extraction. Broadband dielectric spectroscopy and dc electrical conductivity as a function of electric field have been evaluated in specimens containing up to 0.5 wt % of nanofiller. Nanocomposites containing pristine graphene oxide do not show significant changes of electrical properties. On the contrary, the same materials after a proper thermal treatment at 135 C, able to provoke the in situ reduction of graphene oxide, exhibit higher permittivity and electrical conductivity, without showing large decrease of breakdown voltage. Moreover, a nonlinear behavior of the electrical conductivity is observed in the range of electric fields investigated, i.e. 2-30 kV mm 21 . A new relaxation phenomenon with a very low temperature dependence is also evidenced at high frequency in reduced graphene oxide composites, likely associated to induced polarization of electrically conductive nanoparticles.

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“…There are also other applications, 1 such as self-regulating heaters and semiconduct- [2][3][4] ing layers in high voltage power cables to prevent partial discharge. Both applications are generally 5 achieved by using carbon black as the additive.…”

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confidence: 99%

Processability, mechanical properties, and electrical conductivities of carbon black-filled ethylene-vinyl acetate copolymers

Huang

2000

Adv. Polym. Technol.

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The objective of this study was to investigate the processability, mechanical properties, and electrical properties of carbon black‐filled ethylene‐vinyl acetate (EVA) copolymers with different melt flow indexes (MFIs) and vinyl acetate (VA) contents. The effects of carbon black on maximum temperature, equilibrium torque, equilibrium viscosity, and work energy were characterized in a Haake torque rheometer. These properties were found to increase with an increase in carbon black concentration. MFI was found to be the important factor in determining processing properties of the three different EVA resins. Mechanical properties, including tensile modulus, tensile strength at break, and elongation at break were evaluated and the results showed that tensile modulus was dominated by VA content. MFI was the primary factor influencing tensile strength and elongation at break. Volume and surface resistivity of blends were also studied. EVA with higher MFI and higher crystallinity provided a lower percolation concentration. Bound polymer could be used to explain the differences in viscosity and percolation between EVAs at different molecular weights. © 2000 John Wiley & Sons, Inc. Adv Polym Techn 19: 132–139, 2000

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Stress controlling semiconductive shields in medium voltage power distribution cables

Cited by 32 publications

References 8 publications

The Role of Selectively Located Commercial Graphene Nanoplatelets in the Electrical Properties, Morphology, and Stability of EVA/LLDPE Blends

The Role of Selectively Located Commercial Graphene Nanoplatelets in the Electrical Properties, Morphology, and Stability of EVA/LLDPE Blends

Electrical ac and dc behavior of epoxy nanocomposites containing graphene oxide

Processability, mechanical properties, and electrical conductivities of carbon black-filled ethylene-vinyl acetate copolymers

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