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Dielectric properties and thermal conductivity of micro-BN-modified LSR used for high-voltage direct current cable accessories

机译：用于高压直流电缆附件的微BN改性LSR的介电性能和导热性

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摘要

Thermal breakdown is the main form which leads to direct current (DC) cable accessories insulation invalid. In order to enhance the insulation of DC cable accessories, liquid silicone rubber (LSR) is improved by filling micron boron nitride (BN) to promote the dielectric properties and thermal conductivity in this paper. The electrical conductance, DC dielectric breakdown strength (DBS), dielectric spectrum and thermal conductivity of micro-BN/LSR composites with various filling concentrations are analyzed in combination with the charge-trap energy-level distributions by means of isothermal surface potential decay (ISPD) method. By filling micron BN into LSR, the insulation performance and thermal conductivity can be improved simultaneously, thus achieving a higher insulation reliability. When the concentration of BN micron-filler is increased to 40 wt%, the electrical conductivity can be reduced by three orders of magnitude compared with pure LSR, and the DC DBS and thermal conductivity rises by 52.82% and 141.38%, respectively, while the relative dielectric permittivity and dielectric loss are slightly increased. The ISPD analyses indicate that trap-level depth in BN/LSR composites can be further raised by increasing the concentration of BN micron fillers, thereby getting a higher DBS.
机译：热分解是主要形式，导致直流电流（DC）电缆配件绝缘无效。为了增强直流电缆附件的绝缘，通过填充微米氮化硼（BN）来提高液体硅橡胶（LSR），以促进本文的电介质性能和导热性。通过等温表面电位衰减，与各种填充浓度的微bn / LSR复合材料的电导，DC介电击穿强度（DBS），微BN / LSR复合材料的导热率进行分析（ISPD ） 方法。通过将微米BN填充到LSR中，可以同时提高绝缘性能和导热率，从而实现更高的绝缘可靠性。当BN微米填料的浓度增加至40wt％时，与纯LSR相比，电导率可以减少三个数量级，并且DC DB和导热率分别上升52.82％和141.38％，而相对介电常数和介电损耗略有增加。 ISPD分析表明，通过增加BN微米填料的浓度，可以进一步提高BN / LSR复合材料中的捕集水平深度，从而获得更高的DBS。

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  • 来源
    《Journal of materials science》 |2020年第19期|16583-16591|共9页
  • 作者

    Qingguo Chen; Banggen Xi; Jinfeng Zhang; Hongda Yang; Xinyu Wang; Minghe Chi;

  • 作者单位

    Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080. Heilongjiang China;

    Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080. Heilongjiang China;

    School of Electrical Engineering and Automation Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 China;

    Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080. Heilongjiang China;

    Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080. Heilongjiang China;

    Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080. Heilongjiang China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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