Rubber-based composites based on ethylene propylene diene monomer (EPDM) with excellent non-linear electrical conductivity are preferred to serve as reinforced insulation in cable accessories, which can self-adaptively regulate electric field distribution and avoid electric field concentration due to the non-linear conductivity. The conductive carbon nanotubes (CNT) are filled into EPDM to improve the non-linear conductivity, while the insulating hexagonal boron nitride nanosheets (h-BN) are used to reconcile the electric breakdown strength. The results show that with the increase of CNT loading content, the non-linear conductivity of CNT/h-BN/EPDM composites becomes more prominent, accompanying the decrease of threshold field strength and increase of non-linear coefficient. However, the electric breakdown strength of CNT/h-BN/EPDM composites seriously deteriorates due to the increase of CNT content and temperature. By incorporating 10 wt.% h-BN into the composites, the reduction percentage of breakdown strength can be significantly lowered, which is 19.95% of neat EPDM and 13.74% of CNT/h-BN/EPDM composites at 70°C, respectively. The COMSOL Multiphysics simulation results demonstrate that using the CNT/h-BN/EPDM composite as the reinforced insulation can eliminate the electric field concentration of the cable accessory as well as enable the cable accessory with good lightning shock resistance.

中文翻译：

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碳纳米管和六方氮化硼纳米片共填充乙烯丙烯二烯单体复合材料：改善电缆附件应用的电性能

以三元乙丙橡胶（EPDM）为基础的橡胶基复合材料具有优异的非线性导电性能，优选用作电缆附件中的增强绝缘，可以自适应调节电场分布，避免非线性电场集中。线性电导率。将导电碳纳米管（CNT）填充到EPDM中以提高非线性导电性，同时使用绝缘六方氮化硼纳米片（h-BN）来调和电击穿强度。结果表明，随着CNT负载量的增加，CNT/h-BN/EPDM复合材料的非线性电导率变得更加突出，伴随着阈值场强的降低和非线性系数的增加。然而，由于CNT含量和温度的增加，CNT/h-BN/EPDM复合材料的电击穿强度严重恶化。通过在复合材料中掺入 10 wt.% h-BN，可以显着降低击穿强度的降低百分比，在 70°C 下，击穿强度的降低百分比分别为纯 EPDM 的 19.95% 和 CNT/h-BN/EPDM 复合材料的 13.74%。COMSOL Multiphysics仿真结果表明，采用CNT/h-BN/EPDM复合材料作为增强绝缘可以消除电缆附件的电场集中，使电缆附件具有良好的抗雷击能力。70°C 时 CNT/h-BN/EPDM 复合材料的含量分别为 74%。COMSOL Multiphysics仿真结果表明，采用CNT/h-BN/EPDM复合材料作为增强绝缘可以消除电缆附件的电场集中，使电缆附件具有良好的抗雷击能力。70°C 时 CNT/h-BN/EPDM 复合材料的含量分别为 74%。COMSOL Multiphysics仿真结果表明，采用CNT/h-BN/EPDM复合材料作为增强绝缘可以消除电缆附件的电场集中，使电缆附件具有良好的抗雷击能力。