Improved ampacity of buried HVDC cable with high thermal conductivity LDPE/BN insulation

Hexagonal boron nitride nanosheets (BNNSs) are two‐dimensional nanomaterials with graphitic‐like layered nanostructures, high surface areas, and large aspect ratios. Owing to their excellent thermal conductivity, electrical and mechanical strengths, BNNSs are emerging as multifunctional fillers in polymer dielectrics. In this article, the authors review the recent progress in the BN‐containing polymer nanocomposites designed for high‐performance film capacitors. While general synthetic approaches to BNNSs and polymer/BNNS nanocomposites are summarized, particular attention is placed on structure‐property correlation and rational structural design of the composites with optimized dielectric properties and capacitive performances. In stark contrast to the polymer composites employing high dielectric constant fillers to enhance the electric displacement, a new design concept based on the utilization of BNNSs with a wide bandgap to impede electrical conduction and consequently improve breakdown strength and charge‐discharge efficiency of the polymer composites, is highlighted. The significance of developing dielectric capacitors with desirable thermal conductivity and thermal stability to ensure their robust and efficient operation is emphasized. The merits and challenges regarding the existing polymer dielectrics containing BNNSs for energy storage are identified. An outlook for future research opportunities and engineering applications is also presented in this review.

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“…drop-casting and spin coating) and solid-state molding (e.g. hot pressing and melt extrusion) [2,[45][46][47].…”

Section: Fig 3 Scalable High-yield Mechanical and Chemical Exfoliatmentioning

confidence: 99%

Recent progress in polymer dielectrics containing boron nitride nanosheets for high energy density capacitors

Ren

Zhou

et al. 2020

High Voltage

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“…8%, while the dielectric rigidity remained unmodified and the corona discharge resistance increased [35]. In addition, the introduction of boron nitride (BN) particles into LDPE resulted in an increase of the thermal conductivity of up to 1 W·m −1 ∙K −1 at a filler loading of 40 wt % [36].…”

Section: Critical Challenges Of Polymer-based Nanocomposites In Inmentioning

confidence: 99%

Polyethylene Nanocomposites for Power Cable Insulations

et al. 2018

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This review represents a comprehensive study of nanocomposites for power cables insulations based on thermoplastic polymers such as polyethylene congeners like LDPE, HDPE and XLPE, which is complemented by original results. Particular focus lies on the structure-property relationships of nanocomposites and the materials’ design with the corresponding electrical properties. The critical factors, which contribute to the degradation or improvement of the electrical performance of such cable insulations, are discussed in detail; in particular, properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, space charge, electrical and water tree resistance behavior and electric breakdown of such nanocomposites based on thermoplastic polymers are described and referred to the composites’ structures. This review is motivated by the fact that the development of polymer nanocomposites for power cables insulation is based on understanding more closely the aging mechanisms and the behavior of nanocomposites under operating stresses.

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“…More interestingly, it is found that the breakdown field of h-BN can be further increased by decreasing the thickness of h-BN powders to boron nitride nanosheets (BNNSs) with few layers [20]. Numerous studies have focused on the polymer composites filled with BN, in which enhanced dielectric and thermal properties were obtained [1,19,[21][22][23]. Wang and coworkers fabricated a class of BNNS-filled polymer nanocomposites using various polymer matrices e.g., crosslinked divinyltetramethyldisiloxanebis(benzocyclobutene) (c-BCB) [1], poly(vinylidene fluoridetriuoroethylene-chlorouoroethylene) (P(VDF-TrFE-CFE)) [19], and poly(methyl methacrylate) (PMMA) [21].…”

Section: Introductionmentioning

confidence: 99%

“…It is found that synergistic improvements in the dielectric and mechanical strength and thermal conductivity were achieved in the resulting nanocomposites. Du et al [22] mixed hybrid BN filler into LDPE matrix and a thermal conductivity of 0.95 W/m/K was obtained in the LDPE/BN composite with 40 wt% filler loading. In addition, Dang and coworkers [23] fabricated ternary BNNSs/SEBS/PP nanocomposites by melt-mixing of BNNSs and SEBS with PP matrix, the thermal conductivity of the nanocomposites increases to 0.95 W/m/K with a relatively low loading of BNNSs.…”

Section: Introductionmentioning

confidence: 99%

High-performance insulation materials from poly(ether imide)/boron nitride nanosheets with enhanced DC breakdown strength and thermal stability

Xie

Liu

et al. 2019

IEEE Trans. Dielect. Electr. Insul.

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Environmentally-friendly polymers which can be recycled and reused at the end of life are urgently needed for the development of advanced high-voltage direct current (HVDC) systems. Polymer nanocomposites have attracted considerable attention owing to their unique features arising from synergistic combination of inorganic fillers and polymer matrices. Here we describe thermoplastic poly(ether imide) (PEI) nanocomposites that contain boron nitride nanosheets (BNNSs). It is found that the polymer nanocomposites exhibit simultaneous improvements in multiple physical properties, such as the DC electrical breakdown strength, volume resistivity, mechanical strength and thermal stability, along with substantial reduction in loss tangent, compared with neat PEI. A great improvement in thermal conductivity has been attributed to the presence of BNNSs in the composites, which improves heat dissipation in comparison with neat polymers. The composite approach provides a promising solution for alleviating temperaturegradient distribution and addressing heat accumulation issues in HVDC equipment, and enables broader applications of insulation materials in HVDC systems operated under high voltages.

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Improved ampacity of buried HVDC cable with high thermal conductivity LDPE/BN insulation

Cited by 36 publications

References 35 publications

Recent progress in polymer dielectrics containing boron nitride nanosheets for high energy density capacitors

Recent progress in polymer dielectrics containing boron nitride nanosheets for high energy density capacitors

Polyethylene Nanocomposites for Power Cable Insulations

High-performance insulation materials from poly(ether imide)/boron nitride nanosheets with enhanced DC breakdown strength and thermal stability

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