Abstract
In order to improve the thermal conductivity and the insulation properties of polyethylene (PE) used as cable insulation under DC stress, hexagonal boron nitride (h-BN) and inorganic particles have been considered as micro-filler and nano-filler, respectively. As a 2D material, the orientation of h-BN possibly affects the insulation properties of the polymer. It is important to understand the influence of the filler orientation on the insulation performance of the polymer. In this work, a numerical simulation has been performed to investigate the effect of orientation of micro-h-BN on charge transport and DC breakdown of PE-based micro/nano-composites and a comparison between the simulation result and previous literature data has been conducted. The h-BN was designated to be parallel, perpendicular to the normal sample surface vector (the direction of electric field in this work) or randomly distributed in the matrix, and the charge transport behavior and DC breakdown strength in the samples were discussed by using the bipolar charge transport (BCT) model. The results indicated that when the h-BN was perpendicular to the normal vector, the density of trapped charge was the largest and the DC breakdown strength was the highest among the three cases studied. It is suggested that the charge trapping/de-trapping processes and the electric field in the sample vary with the orientation of h-BN through tailoring the trap characteristics of the material.
Highlights
With the development of high voltage direct current (HVDC) transmission projects, the demand of energy delivery with high power density through underground cable has become an urgent issue [1]
Zeng et al revealed that the thermal conductivity of the composites was increased to 1.11 W/m·K, when Hexagonal boron nitride (h-BN) with the average size of 1 μm was added into bismaleimide-triazine (BT) resin at 50 wt %, which represents a six-fold increase compared with pure BT resin [7]
The charge transport and DC breakdown behaviors of polyethylene-based micro/nano-composites with various orientations of the h-BN filler have been investigated by numerical simulation based on the bipolar charge transport (BCT) model in this paper
Summary
With the development of high voltage direct current (HVDC) transmission projects, the demand of energy delivery with high power density through underground cable has become an urgent issue [1]. Previous works have been carried out to investigate the effect of the addition of micro/nano-particles on the thermal conductivity and the insulation properties of composites, when an 2D material with high intrinsic thermal conductivity like h-BN is employed, the effect of the filler orientation on the insulation performance of the micro/nanocomposite is rarely discussed. If we have the h-BN oriented in the melting state through a pressure forming method, the crystal growth in the cooling process may change the orientation At this stage, it is still difficult to achieve an ideal orientation of h-BN in a polyethylene micro/nano-composite. Transport (BCT) model using a novel method for threshold electric field extraction
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